{"id":30090,"date":"2026-07-15T13:58:30","date_gmt":"2026-07-15T05:58:30","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30090"},"modified":"2026-07-15T15:15:26","modified_gmt":"2026-07-15T07:15:26","slug":"factory-automation-surge-protection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/","title":{"rendered":"Factory Automation Surge Protection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30090\" class=\"elementor elementor-30090\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c1fc0cc e-flex e-con-boxed e-con e-parent\" data-id=\"c1fc0cc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-00cdc07 elementor-widget elementor-widget-html\" data-id=\"00cdc07\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n  .ly-fa-guide,\r\n  .ly-fa-guide * {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  .ly-fa-guide {\r\n    --ly-blue: #004898;\r\n    --ly-blue-deep: #07386c;\r\n    --ly-blue-soft: #eef6ff;\r\n    --ly-cyan: #0d7fc6;\r\n    --ly-ink: #17263a;\r\n    --ly-text: #34465b;\r\n    --ly-muted: #66778a;\r\n    --ly-line: #dbe5ef;\r\n    --ly-bg: #f5f8fb;\r\n    --ly-white: #ffffff;\r\n    --ly-green: #147a55;\r\n    --ly-orange: #b85f12;\r\n    --ly-red: #b3261e;\r\n    width: 100%;\r\n    max-width: 100%;\r\n    margin: 0;\r\n    padding: 0;\r\n    color: var(--ly-text);\r\n    font-family: Arial, Helvetica, sans-serif;\r\n    font-size: 17px;\r\n    line-height: 1.72;\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .ly-fa-guide a {\r\n    color: var(--ly-blue);\r\n    text-decoration-thickness: 1px;\r\n    text-underline-offset: 3px;\r\n  }\r\n\r\n  .ly-fa-guide a:hover {\r\n    color: var(--ly-blue-deep);\r\n  }\r\n\r\n  .ly-fa-guide img,\r\n  .ly-fa-guide svg {\r\n    max-width: 100%;\r\n    height: auto;\r\n  }\r\n\r\n  .ly-fa-shell {\r\n    width: min(1180px, calc(100% - 48px));\r\n    margin: 0 auto;\r\n  }\r\n\r\n  .ly-fa-intro {\r\n    padding: 42px 0 18px;\r\n  }\r\n\r\n  .ly-fa-kicker {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    gap: 8px;\r\n    margin: 0 0 14px;\r\n    color: var(--ly-blue);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    letter-spacing: .08em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-fa-kicker::before {\r\n    content: \"\";\r\n    width: 28px;\r\n    height: 3px;\r\n    border-radius: 999px;\r\n    background: var(--ly-blue);\r\n  }\r\n\r\n  .ly-fa-lead {\r\n    max-width: 920px;\r\n    margin: 0;\r\n    color: var(--ly-ink);\r\n    font-size: 22px;\r\n    line-height: 1.48;\r\n    font-weight: 650;\r\n  }\r\n\r\n  .ly-fa-meta {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 10px 18px;\r\n    margin-top: 18px;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n  }\r\n\r\n  .ly-fa-meta span {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    gap: 7px;\r\n  }\r\n\r\n  .ly-fa-meta span::before {\r\n    content: \"\";\r\n    width: 7px;\r\n    height: 7px;\r\n    border-radius: 50%;\r\n    background: var(--ly-cyan);\r\n  }\r\n\r\n  .ly-fa-answer {\r\n    margin: 26px 0 34px;\r\n    padding: 28px;\r\n    border: 1px solid #bfd7ef;\r\n    border-left: 6px solid var(--ly-blue);\r\n    border-radius: 16px;\r\n    background: linear-gradient(135deg, #f7fbff 0%, #edf6ff 100%);\r\n    box-shadow: 0 12px 32px rgba(18, 67, 111, .08);\r\n  }\r\n\r\n  .ly-fa-answer h2,\r\n  .ly-fa-section h2,\r\n  .ly-fa-section h3,\r\n  .ly-fa-section h4 {\r\n    color: var(--ly-ink);\r\n    line-height: 1.25;\r\n  }\r\n\r\n  .ly-fa-answer h2 {\r\n    margin: 0 0 12px;\r\n    font-size: 27px;\r\n  }\r\n\r\n  .ly-fa-answer p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-fa-answer strong {\r\n    color: var(--ly-blue-deep);\r\n  }\r\n\r\n  .ly-fa-answer-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(5, minmax(0, 1fr));\r\n    gap: 12px;\r\n    margin-top: 20px;\r\n  }\r\n\r\n  .ly-fa-answer-item {\r\n    min-height: 112px;\r\n    padding: 16px;\r\n    border: 1px solid rgba(0, 72, 152, .16);\r\n    border-radius: 12px;\r\n    background: rgba(255, 255, 255, .86);\r\n  }\r\n\r\n  .ly-fa-answer-item b {\r\n    display: block;\r\n    margin-bottom: 5px;\r\n    color: var(--ly-blue-deep);\r\n    font-size: 16px;\r\n    line-height: 1.3;\r\n  }\r\n\r\n  .ly-fa-answer-item span {\r\n    display: block;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .ly-fa-toc {\r\n    margin: 0 0 38px;\r\n    padding: 24px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 15px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-fa-toc h2 {\r\n    margin: 0 0 14px;\r\n    color: var(--ly-ink);\r\n    font-size: 22px;\r\n  }\r\n\r\n  .ly-fa-toc ol {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 7px 28px;\r\n    margin: 0;\r\n    padding-left: 22px;\r\n  }\r\n\r\n  .ly-fa-toc li {\r\n    padding: 2px 0;\r\n  }\r\n\r\n  .ly-fa-section {\r\n    padding: 36px 0;\r\n    scroll-margin-top: 90px;\r\n  }\r\n\r\n  .ly-fa-section + .ly-fa-section {\r\n    border-top: 1px solid var(--ly-line);\r\n  }\r\n\r\n  .ly-fa-section h2 {\r\n    margin: 0 0 18px;\r\n    font-size: 32px;\r\n    letter-spacing: -.02em;\r\n  }\r\n\r\n  .ly-fa-section h3 {\r\n    margin: 28px 0 12px;\r\n    font-size: 23px;\r\n  }\r\n\r\n  .ly-fa-section h4 {\r\n    margin: 22px 0 8px;\r\n    font-size: 19px;\r\n  }\r\n\r\n  .ly-fa-section p {\r\n    margin: 0 0 15px;\r\n  }\r\n\r\n  .ly-fa-section ul,\r\n  .ly-fa-section ol {\r\n    margin: 12px 0 18px;\r\n    padding-left: 24px;\r\n  }\r\n\r\n  .ly-fa-section li {\r\n    margin: 6px 0;\r\n  }\r\n\r\n  .ly-fa-note,\r\n  .ly-fa-warning,\r\n  .ly-fa-success {\r\n    margin: 22px 0;\r\n    padding: 19px 21px;\r\n    border-radius: 12px;\r\n  }\r\n\r\n  .ly-fa-note {\r\n    border-left: 5px solid var(--ly-blue);\r\n    background: var(--ly-blue-soft);\r\n  }\r\n\r\n  .ly-fa-warning {\r\n    border-left: 5px solid var(--ly-orange);\r\n    background: #fff7ed;\r\n  }\r\n\r\n  .ly-fa-success {\r\n    border-left: 5px solid var(--ly-green);\r\n    background: #eefaf5;\r\n  }\r\n\r\n  .ly-fa-note p:last-child,\r\n  .ly-fa-warning p:last-child,\r\n  .ly-fa-success p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-fa-architecture {\r\n    margin: 28px 0 12px;\r\n    padding: 24px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 18px;\r\n    background: linear-gradient(180deg, #ffffff 0%, #f7fafc 100%);\r\n    overflow: hidden;\r\n  }\r\n\r\n  .ly-fa-arch-row {\r\n    display: grid;\r\n    grid-template-columns: 1fr 54px 1fr 54px 1fr 54px 1fr;\r\n    align-items: stretch;\r\n    gap: 10px;\r\n  }\r\n\r\n  .ly-fa-node {\r\n    position: relative;\r\n    min-height: 164px;\r\n    padding: 18px;\r\n    border: 1px solid #cddbe8;\r\n    border-top: 5px solid var(--ly-blue);\r\n    border-radius: 13px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 8px 24px rgba(23, 50, 78, .06);\r\n  }\r\n\r\n  .ly-fa-node small {\r\n    display: block;\r\n    margin-bottom: 8px;\r\n    color: var(--ly-cyan);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    letter-spacing: .06em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-fa-node b {\r\n    display: block;\r\n    margin-bottom: 9px;\r\n    color: var(--ly-ink);\r\n    font-size: 18px;\r\n    line-height: 1.3;\r\n  }\r\n\r\n  .ly-fa-node span {\r\n    display: block;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-fa-arrow {\r\n    display: grid;\r\n    place-items: center;\r\n    color: var(--ly-blue);\r\n    font-size: 28px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-fa-branch-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(4, minmax(0, 1fr));\r\n    gap: 14px;\r\n    margin-top: 18px;\r\n  }\r\n\r\n  .ly-fa-branch {\r\n    padding: 17px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 12px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-fa-branch b {\r\n    display: block;\r\n    margin-bottom: 7px;\r\n    color: var(--ly-ink);\r\n    font-size: 16px;\r\n  }\r\n\r\n  .ly-fa-branch span {\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .ly-fa-caption {\r\n    margin: 12px 0 0;\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-fa-figure {\r\n    width: 100%;\r\n    margin: 26px 0 28px;\r\n    padding: 12px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 16px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 10px 30px rgba(20, 52, 82, .07);\r\n    overflow: hidden;\r\n  }\r\n\r\n  .ly-fa-figure img {\r\n    display: block;\r\n    width: 100%;\r\n    height: auto;\r\n    aspect-ratio: 16 \/ 9;\r\n    object-fit: contain;\r\n    border-radius: 10px;\r\n    background: #f7fafc;\r\n  }\r\n\r\n  .ly-fa-figure figcaption {\r\n    margin: 11px 5px 2px;\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-fa-entry-grid,\r\n  .ly-fa-card-grid,\r\n  .ly-fa-check-grid {\r\n    display: grid;\r\n    gap: 16px;\r\n  }\r\n\r\n  .ly-fa-entry-grid {\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    margin: 22px 0;\r\n  }\r\n\r\n  .ly-fa-card-grid {\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    margin: 22px 0;\r\n  }\r\n\r\n  .ly-fa-check-grid {\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    margin: 20px 0;\r\n  }\r\n\r\n  .ly-fa-card,\r\n  .ly-fa-entry,\r\n  .ly-fa-check-card {\r\n    padding: 21px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 14px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 7px 20px rgba(20, 52, 82, .05);\r\n  }\r\n\r\n  .ly-fa-entry {\r\n    border-top: 4px solid var(--ly-blue);\r\n  }\r\n\r\n  .ly-fa-card h3,\r\n  .ly-fa-entry h3,\r\n  .ly-fa-check-card h3 {\r\n    margin: 0 0 10px;\r\n    font-size: 20px;\r\n  }\r\n\r\n  .ly-fa-card p:last-child,\r\n  .ly-fa-entry p:last-child,\r\n  .ly-fa-check-card p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-fa-tag {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    margin-bottom: 11px;\r\n    padding: 5px 9px;\r\n    border-radius: 999px;\r\n    background: var(--ly-blue-soft);\r\n    color: var(--ly-blue-deep);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    line-height: 1;\r\n  }\r\n\r\n  .ly-fa-table-wrap {\r\n    width: 100%;\r\n    margin: 24px 0;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 14px;\r\n    overflow-x: auto;\r\n    background: var(--ly-white);\r\n    -webkit-overflow-scrolling: touch;\r\n  }\r\n\r\n  .ly-fa-table {\r\n    width: 100%;\r\n    min-width: 880px;\r\n    border-collapse: collapse;\r\n    font-size: 15px;\r\n    line-height: 1.48;\r\n  }\r\n\r\n  .ly-fa-table th,\r\n  .ly-fa-table td {\r\n    padding: 15px 14px;\r\n    border-bottom: 1px solid var(--ly-line);\r\n    border-right: 1px solid var(--ly-line);\r\n    text-align: left;\r\n    vertical-align: top;\r\n  }\r\n\r\n  .ly-fa-table th:last-child,\r\n  .ly-fa-table td:last-child {\r\n    border-right: 0;\r\n  }\r\n\r\n  .ly-fa-table tr:last-child td {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .ly-fa-table th {\r\n    background: #eef4fa;\r\n    color: var(--ly-ink);\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-fa-table td:first-child {\r\n    color: var(--ly-ink);\r\n    font-weight: 700;\r\n  }\r\n\r\n  .ly-fa-table .ly-fa-good {\r\n    color: var(--ly-green);\r\n    font-weight: 700;\r\n  }\r\n\r\n  .ly-fa-table .ly-fa-risk {\r\n    color: var(--ly-red);\r\n    font-weight: 700;\r\n  }\r\n\r\n  .ly-fa-flow {\r\n    display: grid;\r\n    grid-template-columns: repeat(5, minmax(0, 1fr));\r\n    gap: 10px;\r\n    margin: 24px 0;\r\n  }\r\n\r\n  .ly-fa-step {\r\n    position: relative;\r\n    min-height: 152px;\r\n    padding: 18px 16px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 13px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-fa-step::after {\r\n    content: \"\u2192\";\r\n    position: absolute;\r\n    top: 50%;\r\n    right: -13px;\r\n    z-index: 2;\r\n    transform: translateY(-50%);\r\n    color: var(--ly-blue);\r\n    font-size: 22px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-fa-step:last-child::after {\r\n    display: none;\r\n  }\r\n\r\n  .ly-fa-step em {\r\n    display: grid;\r\n    place-items: center;\r\n    width: 31px;\r\n    height: 31px;\r\n    margin-bottom: 11px;\r\n    border-radius: 50%;\r\n    background: var(--ly-blue);\r\n    color: #fff;\r\n    font-style: normal;\r\n    font-size: 14px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-fa-step b {\r\n    display: block;\r\n    margin-bottom: 7px;\r\n    color: var(--ly-ink);\r\n    font-size: 17px;\r\n    line-height: 1.35;\r\n  }\r\n\r\n  .ly-fa-step span {\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .ly-fa-do-dont {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 18px;\r\n    margin: 24px 0;\r\n  }\r\n\r\n  .ly-fa-do,\r\n  .ly-fa-dont {\r\n    padding: 21px;\r\n    border-radius: 14px;\r\n  }\r\n\r\n  .ly-fa-do {\r\n    border: 1px solid #b9dfce;\r\n    background: #f1fbf6;\r\n  }\r\n\r\n  .ly-fa-dont {\r\n    border: 1px solid #efc5c2;\r\n    background: #fff5f4;\r\n  }\r\n\r\n  .ly-fa-do h3,\r\n  .ly-fa-dont h3 {\r\n    margin: 0 0 10px;\r\n  }\r\n\r\n  .ly-fa-do h3 {\r\n    color: var(--ly-green);\r\n  }\r\n\r\n  .ly-fa-dont h3 {\r\n    color: var(--ly-red);\r\n  }\r\n\r\n  .ly-fa-quote-box {\r\n    display: grid;\r\n    grid-template-columns: 1.1fr .9fr;\r\n    gap: 22px;\r\n    margin: 24px 0;\r\n    padding: 25px;\r\n    border: 1px solid #bfd7ef;\r\n    border-radius: 16px;\r\n    background: linear-gradient(135deg, #f7fbff, #edf6ff);\r\n  }\r\n\r\n  .ly-fa-quote-box h3 {\r\n    margin-top: 0;\r\n  }\r\n\r\n  .ly-fa-quote-list {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 8px 20px;\r\n    margin: 0;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .ly-fa-quote-list li {\r\n    position: relative;\r\n    margin: 0;\r\n    padding-left: 20px;\r\n  }\r\n\r\n  .ly-fa-quote-list li::before {\r\n    content: \"\u2713\";\r\n    position: absolute;\r\n    left: 0;\r\n    color: var(--ly-green);\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-fa-mini-form {\r\n    padding: 20px;\r\n    border-radius: 13px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 10px 25px rgba(0, 72, 152, .08);\r\n  }\r\n\r\n  .ly-fa-mini-form b {\r\n    display: block;\r\n    margin-bottom: 10px;\r\n    color: var(--ly-ink);\r\n    font-size: 18px;\r\n  }\r\n\r\n  .ly-fa-mini-form p {\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n  }\r\n\r\n  .ly-fa-btn-row {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 12px;\r\n    margin-top: 17px;\r\n  }\r\n\r\n  .ly-fa-btn {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    justify-content: center;\r\n    min-height: 46px;\r\n    padding: 12px 19px;\r\n    border: 2px solid var(--ly-blue);\r\n    border-radius: 8px;\r\n    background: var(--ly-blue);\r\n    color: #fff !important;\r\n    font-size: 15px;\r\n    font-weight: 800;\r\n    line-height: 1.2;\r\n    text-decoration: none !important;\r\n    cursor: pointer;\r\n    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;\r\n  }\r\n\r\n  .ly-fa-btn > span,\r\n  .ly-fa-btn > .w-btn-label,\r\n  .ly-fa-btn.leeyee-site-popup-btn > span,\r\n  .ly-fa-btn.leeyee-site-popup-btn > .w-btn-label {\r\n    display: inline-block !important;\r\n    width: auto !important;\r\n    height: auto !important;\r\n    margin: 0 !important;\r\n    padding: 0 !important;\r\n    position: static !important;\r\n    clip: auto !important;\r\n    clip-path: none !important;\r\n    overflow: visible !important;\r\n    visibility: visible !important;\r\n    opacity: 1 !important;\r\n    transform: none !important;\r\n    color: inherit !important;\r\n    background: transparent !important;\r\n    font-family: inherit !important;\r\n    font-size: inherit !important;\r\n    font-weight: inherit !important;\r\n    line-height: inherit !important;\r\n    letter-spacing: normal !important;\r\n    text-indent: 0 !important;\r\n    white-space: normal !important;\r\n    z-index: 2 !important;\r\n  }\r\n\r\n  .ly-fa-btn:hover {\r\n    transform: translateY(-1px);\r\n    background: var(--ly-blue-deep);\r\n    border-color: var(--ly-blue-deep);\r\n    box-shadow: 0 9px 18px rgba(0, 72, 152, .18);\r\n  }\r\n\r\n  \/* Impreza popup-button compatibility: use a real button and prevent the\r\n     theme's generated layers from covering or hiding the visible label. *\/\r\n  .ly-fa-guide button.ly-fa-btn.leeyee-site-popup-btn {\r\n    -webkit-appearance: none !important;\r\n    appearance: none !important;\r\n    position: relative !important;\r\n    isolation: isolate !important;\r\n    overflow: visible !important;\r\n    color: #fff !important;\r\n    font-family: Arial, Helvetica, sans-serif !important;\r\n    font-size: 15px !important;\r\n    font-weight: 800 !important;\r\n    line-height: 1.2 !important;\r\n    text-indent: 0 !important;\r\n  }\r\n\r\n  .ly-fa-guide button.ly-fa-btn.leeyee-site-popup-btn::before,\r\n  .ly-fa-guide button.ly-fa-btn.leeyee-site-popup-btn::after {\r\n    content: none !important;\r\n    display: none !important;\r\n  }\r\n\r\n  .ly-fa-guide button.ly-fa-btn.leeyee-site-popup-btn > .ly-fa-popup-label {\r\n    display: inline-block !important;\r\n    position: relative !important;\r\n    inset: auto !important;\r\n    z-index: 10 !important;\r\n    width: auto !important;\r\n    height: auto !important;\r\n    min-width: 0 !important;\r\n    min-height: 0 !important;\r\n    margin: 0 !important;\r\n    padding: 0 !important;\r\n    clip: auto !important;\r\n    clip-path: none !important;\r\n    overflow: visible !important;\r\n    visibility: visible !important;\r\n    opacity: 1 !important;\r\n    transform: none !important;\r\n    color: #fff !important;\r\n    background: transparent !important;\r\n    font-family: Arial, Helvetica, sans-serif !important;\r\n    font-size: 15px !important;\r\n    font-weight: 800 !important;\r\n    line-height: 1.2 !important;\r\n    letter-spacing: normal !important;\r\n    text-indent: 0 !important;\r\n    white-space: normal !important;\r\n    pointer-events: none !important;\r\n  }\r\n\r\n  .ly-fa-btn-light {\r\n    background: #fff;\r\n    color: var(--ly-blue) !important;\r\n  }\r\n\r\n  .ly-fa-btn-light:hover {\r\n    background: #eff6fd;\r\n    color: var(--ly-blue-deep) !important;\r\n  }\r\n\r\n  .ly-fa-faq {\r\n    margin-top: 20px;\r\n  }\r\n\r\n  .ly-fa-faq details {\r\n    border-top: 1px solid var(--ly-line);\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-fa-faq details:last-child {\r\n    border-bottom: 1px solid var(--ly-line);\r\n  }\r\n\r\n  .ly-fa-faq summary {\r\n    position: relative;\r\n    padding: 18px 44px 18px 0;\r\n    color: var(--ly-ink);\r\n    font-size: 18px;\r\n    font-weight: 750;\r\n    line-height: 1.4;\r\n    cursor: pointer;\r\n    list-style: none;\r\n  }\r\n\r\n  .ly-fa-faq summary::-webkit-details-marker {\r\n    display: none;\r\n  }\r\n\r\n  .ly-fa-faq summary::after {\r\n    content: \"+\";\r\n    position: absolute;\r\n    top: 16px;\r\n    right: 5px;\r\n    width: 28px;\r\n    height: 28px;\r\n    border-radius: 50%;\r\n    background: var(--ly-blue-soft);\r\n    color: var(--ly-blue);\r\n    text-align: center;\r\n    font-size: 20px;\r\n    line-height: 28px;\r\n  }\r\n\r\n  .ly-fa-faq details[open] summary::after {\r\n    content: \"\u2212\";\r\n  }\r\n\r\n  .ly-fa-faq-answer {\r\n    padding: 0 38px 18px 0;\r\n  }\r\n\r\n  .ly-fa-related {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 14px;\r\n    margin: 22px 0 0;\r\n  }\r\n\r\n  .ly-fa-related a {\r\n    display: block;\r\n    min-height: 122px;\r\n    padding: 18px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 13px;\r\n    background: var(--ly-white);\r\n    color: var(--ly-ink);\r\n    text-decoration: none;\r\n    transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;\r\n  }\r\n\r\n  .ly-fa-related a:hover {\r\n    transform: translateY(-2px);\r\n    border-color: #a8c7e5;\r\n    box-shadow: 0 10px 22px rgba(17, 56, 92, .08);\r\n  }\r\n\r\n  .ly-fa-related b {\r\n    display: block;\r\n    margin-bottom: 7px;\r\n    color: var(--ly-blue-deep);\r\n    font-size: 17px;\r\n    line-height: 1.35;\r\n  }\r\n\r\n  .ly-fa-related span {\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n    line-height: 1.45;\r\n  }\r\n\r\n  .ly-fa-references {\r\n    padding: 30px;\r\n    border-radius: 16px;\r\n    background: var(--ly-bg);\r\n  }\r\n\r\n  .ly-fa-references ol {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-fa-references li {\r\n    margin: 10px 0;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-fa-final-cta {\r\n    margin: 38px 0 12px;\r\n    padding: 30px;\r\n    border-radius: 18px;\r\n    background: linear-gradient(135deg, #07386c 0%, #004898 58%, #0b71b7 100%);\r\n    color: #fff;\r\n  }\r\n\r\n  .ly-fa-final-cta h2 {\r\n    margin: 0 0 10px;\r\n    color: #fff;\r\n    font-size: 29px;\r\n  }\r\n\r\n  .ly-fa-final-cta p {\r\n    max-width: 850px;\r\n    margin: 0;\r\n    color: rgba(255, 255, 255, .88);\r\n  }\r\n\r\n  .ly-fa-final-cta .ly-fa-btn {\r\n    border-color: #fff;\r\n    background: #fff;\r\n    color: var(--ly-blue-deep) !important;\r\n  }\r\n\r\n  \/* The default popup label is white on blue. In the final CTA the primary\r\n     popup button is white, so its label must be explicitly dark blue. *\/\r\n  .ly-fa-guide .ly-fa-final-cta button.ly-fa-btn.leeyee-site-popup-btn,\r\n  .ly-fa-guide .ly-fa-final-cta button.ly-fa-btn.leeyee-site-popup-btn > .ly-fa-popup-label {\r\n    color: var(--ly-blue-deep) !important;\r\n    -webkit-text-fill-color: var(--ly-blue-deep) !important;\r\n    opacity: 1 !important;\r\n    visibility: visible !important;\r\n  }\r\n\r\n  .ly-fa-guide .ly-fa-final-cta button.ly-fa-btn.leeyee-site-popup-btn:hover,\r\n  .ly-fa-guide .ly-fa-final-cta button.ly-fa-btn.leeyee-site-popup-btn:hover > .ly-fa-popup-label {\r\n    color: var(--ly-blue-deep) !important;\r\n    -webkit-text-fill-color: var(--ly-blue-deep) !important;\r\n  }\r\n\r\n  .ly-fa-final-cta .ly-fa-btn-light {\r\n    background: transparent;\r\n    color: #fff !important;\r\n  }\r\n\r\n  .ly-fa-footnote {\r\n    margin-top: 14px;\r\n    color: var(--ly-muted);\r\n    font-size: 13px;\r\n  }\r\n\r\n  \/* 1440px desktop *\/\r\n  @media (max-width: 1440px) {\r\n    .ly-fa-shell { width: min(1160px, calc(100% - 44px)); }\r\n    .ly-fa-guide { font-size: 17px; }\r\n    .ly-fa-section h2 { font-size: 31px; }\r\n  }\r\n\r\n  \/* 1366px desktop *\/\r\n  @media (max-width: 1366px) {\r\n    .ly-fa-shell { width: min(1120px, calc(100% - 42px)); }\r\n    .ly-fa-answer-grid { gap: 10px; }\r\n    .ly-fa-answer-item { padding: 15px; }\r\n    .ly-fa-node { padding: 16px; }\r\n  }\r\n\r\n  \/* 1280px desktop *\/\r\n  @media (max-width: 1280px) {\r\n    .ly-fa-shell { width: min(1080px, calc(100% - 40px)); }\r\n    .ly-fa-lead { font-size: 21px; }\r\n    .ly-fa-arch-row { grid-template-columns: 1fr 40px 1fr 40px 1fr 40px 1fr; }\r\n    .ly-fa-arrow { font-size: 24px; }\r\n    .ly-fa-flow { gap: 8px; }\r\n  }\r\n\r\n  \/* 1024px tablet landscape *\/\r\n  @media (max-width: 1024px) {\r\n    .ly-fa-shell { width: calc(100% - 36px); }\r\n    .ly-fa-figure { margin: 24px 0 26px; padding: 10px; }\r\n    .ly-fa-intro { padding-top: 34px; }\r\n    .ly-fa-answer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }\r\n    .ly-fa-entry-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }\r\n    .ly-fa-check-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }\r\n    .ly-fa-arch-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }\r\n    .ly-fa-arrow { display: none; }\r\n    .ly-fa-branch-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }\r\n    .ly-fa-flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }\r\n    .ly-fa-step::after { display: none; }\r\n    .ly-fa-quote-box { grid-template-columns: 1fr; }\r\n    .ly-fa-related { grid-template-columns: repeat(2, minmax(0, 1fr)); }\r\n  }\r\n\r\n  \/* 912px tablet *\/\r\n  @media (max-width: 912px) {\r\n    .ly-fa-guide { font-size: 16.5px; }\r\n    .ly-fa-shell { width: calc(100% - 32px); }\r\n    .ly-fa-section { padding: 32px 0; }\r\n    .ly-fa-section h2 { font-size: 29px; }\r\n    .ly-fa-answer { padding: 24px; }\r\n    .ly-fa-toc ol { gap: 6px 20px; }\r\n    .ly-fa-card-grid { gap: 14px; }\r\n  }\r\n\r\n  \/* 820px tablet *\/\r\n  @media (max-width: 820px) {\r\n    .ly-fa-lead { font-size: 20px; }\r\n    .ly-fa-answer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }\r\n    .ly-fa-toc ol { grid-template-columns: 1fr; }\r\n    .ly-fa-card-grid { grid-template-columns: 1fr; }\r\n    .ly-fa-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }\r\n    .ly-fa-do-dont { grid-template-columns: 1fr; }\r\n    .ly-fa-table { min-width: 820px; }\r\n  }\r\n\r\n  \/* 768px tablet portrait *\/\r\n  @media (max-width: 768px) {\r\n    .ly-fa-shell { width: calc(100% - 28px); }\r\n    .ly-fa-figure { border-radius: 14px; }\r\n    .ly-fa-figure img { border-radius: 8px; }\r\n    .ly-fa-intro { padding: 30px 0 14px; }\r\n    .ly-fa-section h2 { font-size: 28px; }\r\n    .ly-fa-section h3 { font-size: 22px; }\r\n    .ly-fa-answer h2 { font-size: 25px; }\r\n    .ly-fa-entry-grid,\r\n    .ly-fa-check-grid { grid-template-columns: 1fr; }\r\n    .ly-fa-quote-list { grid-template-columns: 1fr; }\r\n    .ly-fa-table th,\r\n    .ly-fa-table td { padding: 13px 12px; }\r\n  }\r\n\r\n  \/* 600px mobile large *\/\r\n  @media (max-width: 600px) {\r\n    .ly-fa-guide { font-size: 16px; line-height: 1.68; }\r\n    .ly-fa-figure { margin: 21px 0 23px; padding: 8px; border-radius: 12px; }\r\n    .ly-fa-figure figcaption { margin: 9px 3px 1px; font-size: 12.5px; }\r\n    .ly-fa-shell { width: calc(100% - 24px); }\r\n    .ly-fa-kicker { font-size: 12px; }\r\n    .ly-fa-lead { font-size: 19px; line-height: 1.45; }\r\n    .ly-fa-meta { display: grid; gap: 7px; }\r\n    .ly-fa-review { display: grid; gap: 7px; }\r\n    .ly-fa-answer { margin-top: 21px; padding: 20px; border-radius: 13px; }\r\n    .ly-fa-answer-grid { grid-template-columns: 1fr; }\r\n    .ly-fa-answer-item { min-height: auto; }\r\n    .ly-fa-toc { padding: 20px; }\r\n    .ly-fa-section { padding: 29px 0; }\r\n    .ly-fa-section h2 { font-size: 26px; }\r\n    .ly-fa-section h3 { margin-top: 24px; font-size: 21px; }\r\n    .ly-fa-architecture { padding: 18px; }\r\n    .ly-fa-arch-row,\r\n    .ly-fa-branch-grid { grid-template-columns: 1fr; }\r\n    .ly-fa-node { min-height: auto; }\r\n    .ly-fa-flow { grid-template-columns: 1fr; }\r\n    .ly-fa-step { min-height: auto; }\r\n    .ly-fa-related { grid-template-columns: 1fr; }\r\n    .ly-fa-quote-box { padding: 20px; }\r\n    .ly-fa-final-cta { padding: 24px; }\r\n    .ly-fa-final-cta h2 { font-size: 26px; }\r\n    .ly-fa-references { padding: 22px; }\r\n    .ly-fa-btn-row { display: grid; grid-template-columns: 1fr; }\r\n    .ly-fa-btn { width: 100%; }\r\n  }\r\n\r\n  \/* 540px mobile *\/\r\n  @media (max-width: 540px) {\r\n    .ly-fa-shell { width: calc(100% - 22px); }\r\n    .ly-fa-intro { padding-top: 26px; }\r\n    .ly-fa-answer h2 { font-size: 24px; }\r\n    .ly-fa-section h2 { font-size: 25px; }\r\n    .ly-fa-card,\r\n    .ly-fa-entry,\r\n    .ly-fa-check-card { padding: 19px; }\r\n    .ly-fa-table { min-width: 760px; font-size: 14px; }\r\n  }\r\n\r\n  \/* 480px mobile *\/\r\n  @media (max-width: 480px) {\r\n    .ly-fa-shell { width: calc(100% - 20px); }\r\n    .ly-fa-figure { padding: 6px; }\r\n    .ly-fa-figure img { border-radius: 7px; }\r\n    .ly-fa-lead { font-size: 18px; }\r\n    .ly-fa-answer,\r\n    .ly-fa-toc,\r\n    .ly-fa-architecture { padding: 18px; }\r\n    .ly-fa-section h2 { font-size: 24px; }\r\n    .ly-fa-section h3 { font-size: 20px; }\r\n    .ly-fa-note,\r\n    .ly-fa-warning,\r\n    .ly-fa-success { padding: 17px; }\r\n    .ly-fa-faq summary { font-size: 17px; }\r\n  }\r\n\r\n  \/* 430px mobile *\/\r\n  @media (max-width: 430px) {\r\n    .ly-fa-guide { font-size: 15.8px; }\r\n    .ly-fa-shell { width: calc(100% - 18px); }\r\n    .ly-fa-kicker::before { width: 22px; }\r\n    .ly-fa-answer h2 { font-size: 23px; }\r\n    .ly-fa-section h2 { font-size: 23px; }\r\n    .ly-fa-final-cta h2 { font-size: 24px; }\r\n    .ly-fa-table { min-width: 720px; }\r\n  }\r\n\r\n  \/* 414px mobile *\/\r\n  @media (max-width: 414px) {\r\n    .ly-fa-meta { font-size: 13px; }\r\n    .ly-fa-answer { border-left-width: 5px; }\r\n    .ly-fa-card,\r\n    .ly-fa-entry,\r\n    .ly-fa-check-card { padding: 18px; }\r\n    .ly-fa-related a { min-height: auto; }\r\n  }\r\n\r\n  \/* 390px mobile *\/\r\n  @media (max-width: 390px) {\r\n    .ly-fa-shell { width: calc(100% - 16px); }\r\n    .ly-fa-figure { margin: 19px 0 21px; }\r\n    .ly-fa-figure figcaption { font-size: 12px; }\r\n    .ly-fa-lead { font-size: 17.5px; }\r\n    .ly-fa-answer,\r\n    .ly-fa-toc,\r\n    .ly-fa-architecture,\r\n    .ly-fa-quote-box,\r\n    .ly-fa-final-cta { padding: 17px; }\r\n    .ly-fa-section h2 { font-size: 22px; }\r\n    .ly-fa-node b { font-size: 17px; }\r\n  }\r\n\r\n  \/* 375px mobile *\/\r\n  @media (max-width: 375px) {\r\n    .ly-fa-guide { font-size: 15.5px; }\r\n    .ly-fa-intro { padding-top: 23px; }\r\n    .ly-fa-answer h2 { font-size: 22px; }\r\n    .ly-fa-section h3 { font-size: 19px; }\r\n    .ly-fa-table th,\r\n    .ly-fa-table td { padding: 12px 10px; }\r\n  }\r\n\r\n  \/* 360px mobile *\/\r\n  @media (max-width: 360px) {\r\n    .ly-fa-shell { width: calc(100% - 14px); }\r\n    .ly-fa-kicker { letter-spacing: .05em; }\r\n    .ly-fa-lead { font-size: 17px; }\r\n    .ly-fa-final-cta { border-radius: 14px; }\r\n    .ly-fa-btn { padding-left: 14px; padding-right: 14px; }\r\n  }\r\n\r\n  \/* 320px mobile *\/\r\n  @media (max-width: 320px) {\r\n    .ly-fa-guide { font-size: 15px; }\r\n    .ly-fa-figure { padding: 5px; }\r\n    .ly-fa-shell { width: calc(100% - 12px); }\r\n    .ly-fa-answer,\r\n    .ly-fa-toc,\r\n    .ly-fa-architecture,\r\n    .ly-fa-quote-box,\r\n    .ly-fa-final-cta,\r\n    .ly-fa-references { padding: 15px; }\r\n    .ly-fa-section h2 { font-size: 21px; }\r\n    .ly-fa-answer h2 { font-size: 21px; }\r\n    .ly-fa-faq summary { padding-right: 38px; font-size: 16px; }\r\n  }\r\n\r\n  .ly-fa-review {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 10px 22px;\r\n    margin-top: 15px;\r\n    padding: 14px 16px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 11px;\r\n    background: var(--ly-white);\r\n    color: var(--ly-muted);\r\n    font-size: 13.5px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .ly-fa-review strong {\r\n    color: var(--ly-ink);\r\n  }\r\n\r\n  .ly-fa-ref {\r\n    display: inline-block;\r\n    margin-left: 2px;\r\n    font-size: .76em;\r\n    font-weight: 800;\r\n    line-height: 1;\r\n    vertical-align: super;\r\n    text-decoration: none;\r\n  }\r\n\r\n  .ly-fa-example-label {\r\n    display: inline-flex;\r\n    margin: 0 0 12px;\r\n    padding: 6px 10px;\r\n    border-radius: 999px;\r\n    background: var(--ly-blue-soft);\r\n    color: var(--ly-blue-deep);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    letter-spacing: .04em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-fa-capability-status {\r\n    display: inline-flex;\r\n    margin-top: 8px;\r\n    padding: 5px 9px;\r\n    border-radius: 999px;\r\n    background: #eefaf5;\r\n    color: var(--ly-green);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-fa-capability-status.ly-fa-confirm {\r\n    background: #fff7ed;\r\n    color: var(--ly-orange);\r\n  }\r\n\r\n<\/style>\r\n\r\n<article class=\"ly-fa-guide\" aria-label=\"Factory automation surge protection engineering guide\">\r\n  <div class=\"ly-fa-shell\">\r\n    <header class=\"ly-fa-intro\">\r\n      <p class=\"ly-fa-kicker\">Industrial Automation Engineering Guide<\/p>\r\n      <p class=\"ly-fa-lead\">A reliable factory automation surge protection plan must protect every conductive path into the control system\u2014not only the incoming AC supply. This industrial automation surge protection guide coordinates protection for distribution boards, control-cabinet power, 24 V DC circuits, PLC I\/O, field instruments, RS485 or Modbus links, industrial Ethernet, and long outdoor cables.<\/p>\r\n      <div class=\"ly-fa-meta\" aria-label=\"Article information\">\r\n        <span>For system integrators, panel builders, OEMs and maintenance teams<\/span>\r\n        <span>Last reviewed July 15, 2026<\/span>\r\n        <span>IEC-oriented project selection<\/span>\r\n      <\/div>\r\n      <div class=\"ly-fa-review\" aria-label=\"Article authorship and technical review\">\r\n        <span><strong>Prepared by:<\/strong> LEEYEE Technical Content Team<\/span>\r\n        <span><strong>Technical review:<\/strong> LEEYEE Surge Protection Engineering Team<\/span>\r\n        <span><strong>Scope:<\/strong> Conceptual project selection; final specification requires circuit data<\/span>\r\n      <\/div>\r\n    <\/header>\r\n\r\n    <section class=\"ly-fa-answer\" aria-labelledby=\"ly-fa-quick-answer\">\r\n      <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#quick-answer\" >Quick Answer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#in-this-guide\" >In This Guide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#1-factory-automation-surge-protection-architecture\" >1. Factory Automation Surge Protection Architecture<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#2-where-surges-enter-a-factory-automation-system\" >2. Where Surges Enter a Factory Automation System<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#3-protect-the-power-path-main-distribution-control-cabinets-and-24-v-dc\" >3. Protect the Power Path: Main Distribution, Control Cabinets and 24 V DC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#4-plc-io-4%e2%80%9320-ma-and-sensor-line-protection\" >4. PLC I\/O, 4\u201320 mA and Sensor-Line Protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#5-rs485-modbus-fieldbus-and-industrial-ethernet-protection\" >5. RS485, Modbus, Fieldbus and Industrial Ethernet Protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#6-spd-selection-matrix-by-cabinet-and-interface\" >6. SPD Selection Matrix by Cabinet and Interface<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#7-example-protection-schedule-for-one-plc-control-cabinet\" >7. Example Protection Schedule for One PLC Control Cabinet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#8-what-leeyee-can-support-for-factory-automation-projects\" >8. What LEEYEE Can Support for Factory Automation Projects<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#9-installation-and-coordination-rules-that-decide-real-protection\" >9. Installation and Coordination Rules That Decide Real Protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#10-oem-and-project-ordering-checklist\" >10. OEM and Project Ordering Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#11-frequently-asked-questions\" >11. Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#related-engineering-guides\" >Related Engineering Guides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#technical-references\" >Technical References<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/factory-automation-surge-protection-guide\/#send-the-cabinet-drawing-not-just-a-voltage\" >Send the Cabinet Drawing, Not Just a Voltage<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"ly-fa-quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer\"><\/span>Quick Answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p><strong>Do not treat a factory as one electrical circuit.<\/strong> Divide the automation system into protection zones and check every cable that crosses a zone boundary. At minimum, review five surge entry paths:<\/p>\r\n      <div class=\"ly-fa-answer-grid\">\r\n        <div class=\"ly-fa-answer-item\"><b>AC power<\/b><span>Main distribution, machine panels and cabinet incoming feeds.<\/span><\/div>\r\n        <div class=\"ly-fa-answer-item\"><b>24 V DC power<\/b><span>PLC, HMI, relays, remote I\/O and instrument supply circuits.<\/span><\/div>\r\n        <div class=\"ly-fa-answer-item\"><b>PLC I\/O<\/b><span>Digital, analog, pulse, 4\u201320 mA, RTD and other field circuits.<\/span><\/div>\r\n        <div class=\"ly-fa-answer-item\"><b>Industrial data<\/b><span>RS485, Modbus, CAN, PROFIBUS, Ethernet and PoE.<\/span><\/div>\r\n        <div class=\"ly-fa-answer-item\"><b>Outdoor cables<\/b><span>Sensors, actuators and inter-building copper links exposed to induced surges.<\/span><\/div>\r\n      <\/div>\r\n      <p><strong>A single Type 2 SPD in the main distribution board cannot protect field signal ports or communication interfaces.<\/strong> Factory automation surge protection normally requires coordinated devices for power, control and communication circuits. Each path needs an SPD that matches its voltage, current, wiring, data rate, grounding method and equipment withstand level.<\/p>\r\n    <\/section>\r\n\r\n    <nav class=\"ly-fa-toc\" aria-label=\"Page contents\">\r\n      <h2><span class=\"ez-toc-section\" id=\"in-this-guide\"><\/span>In This Guide<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <ol>\r\n        <li><a href=\"#architecture\">Factory automation protection architecture<\/a><\/li>\r\n        <li><a href=\"#entry-points\">Where surges enter the system<\/a><\/li>\r\n        <li><a href=\"#power-protection\">AC and 24 V DC protection<\/a><\/li>\r\n        <li><a href=\"#io-protection\">PLC I\/O and sensor-line protection<\/a><\/li>\r\n        <li><a href=\"#network-protection\">RS485, Modbus and Ethernet protection<\/a><\/li>\r\n        <li><a href=\"#selection-matrix\">Cabinet and signal selection matrix<\/a><\/li>\r\n        <li><a href=\"#example-schedule\">Example PLC cabinet protection schedule<\/a><\/li>\r\n        <li><a href=\"#leeyee-support\">LEEYEE project and OEM support<\/a><\/li>\r\n        <li><a href=\"#installation\">Installation and coordination rules<\/a><\/li>\r\n        <li><a href=\"#ordering\">OEM and project ordering checklist<\/a><\/li>\r\n        <li><a href=\"#faq\">Frequently asked questions<\/a><\/li>\r\n      <\/ol>\r\n    <\/nav>\r\n\r\n    <section class=\"ly-fa-section\" id=\"architecture\">\r\n      <h2><span class=\"ez-toc-section\" id=\"1-factory-automation-surge-protection-architecture\"><\/span>1. Factory Automation Surge Protection Architecture<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>The most useful way to design protection is to follow the system from the utility entrance to the field device. Each stage reduces surge energy or prevents a new surge path from bypassing upstream protection.<\/p>\r\n\r\n      <figure class=\"ly-fa-figure\">\r\n        <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/factory-automation-surge-protection-architecture.webp\" alt=\"Factory automation surge protection architecture for AC power, 24V DC, PLC I\/O and industrial communication networks\" width=\"1600\" height=\"900\" loading=\"lazy\" decoding=\"async\">\r\n        <figcaption>Complete protection architecture from the service entrance and distribution boards to 24 V DC power, PLC I\/O, industrial networks and exposed field devices.<\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-fa-architecture\" role=\"img\" aria-label=\"Factory automation surge protection architecture from service entrance to control cabinet and field devices\">\r\n        <div class=\"ly-fa-arch-row\">\r\n          <div class=\"ly-fa-node\">\r\n            <small>Zone A<\/small>\r\n            <b>Service Entrance<\/b>\r\n            <span>Main low-voltage switchboard. Review direct-lightning-current risk, external LPS, overhead supply and local code requirements.<\/span>\r\n          <\/div>\r\n          <div class=\"ly-fa-arrow\" aria-hidden=\"true\">\u2192<\/div>\r\n          <div class=\"ly-fa-node\">\r\n            <small>Zone B<\/small>\r\n            <b>Factory Distribution<\/b>\r\n            <span>Sub-distribution boards, MCCs and machine feeders. Reduce residual and internally generated transients.<\/span>\r\n          <\/div>\r\n          <div class=\"ly-fa-arrow\" aria-hidden=\"true\">\u2192<\/div>\r\n          <div class=\"ly-fa-node\">\r\n            <small>Zone C<\/small>\r\n            <b>Control Cabinet<\/b>\r\n            <span>Cabinet AC input, power supply, 24 V DC bus, PLC, HMI, relays and communication modules.<\/span>\r\n          <\/div>\r\n          <div class=\"ly-fa-arrow\" aria-hidden=\"true\">\u2192<\/div>\r\n          <div class=\"ly-fa-node\">\r\n            <small>Zone D<\/small>\r\n            <b>Field & Network<\/b>\r\n            <span>Remote I\/O, sensors, actuators, RS485, Ethernet, outdoor equipment and inter-building links.<\/span>\r\n          <\/div>\r\n        <\/div>\r\n        <div class=\"ly-fa-branch-grid\">\r\n          <div class=\"ly-fa-branch\"><b>Power boundary<\/b><span>Use an AC or DC power SPD selected for the actual system voltage and installation category.<\/span><\/div>\r\n          <div class=\"ly-fa-branch\"><b>Signal boundary<\/b><span>Use a signal SPD matched to line count, operating voltage, current loop and bandwidth.<\/span><\/div>\r\n          <div class=\"ly-fa-branch\"><b>Network boundary<\/b><span>Use protocol-compatible protection for copper data links, including PoE where present.<\/span><\/div>\r\n          <div class=\"ly-fa-branch\"><b>Bonding boundary<\/b><span>Connect protection to the local equipotential bonding system using short, direct conductors.<\/span><\/div>\r\n        <\/div>\r\n        <p class=\"ly-fa-caption\">Conceptual architecture only. Final SPD type, rating and installation position must follow the site risk assessment, power system, cable routing, equipment immunity, local regulations and the selected manufacturer\u2019s instructions.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-fa-note\">\r\n        <p><strong>Why this architecture matters:<\/strong> a surge can enter through the AC supply, but it can also arrive through a sensor cable, communication pair, shield, antenna line or copper link between buildings. Protecting one path does not automatically protect the others.<\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"entry-points\">\r\n      <h2><span class=\"ez-toc-section\" id=\"2-where-surges-enter-a-factory-automation-system\"><\/span>2. Where Surges Enter a Factory Automation System<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>Automation failures are often blamed on \u201cbad power,\u201d but the actual entry path may be outside the cabinet power circuit. The system review should trace every conductor connected to the PLC, HMI, controller, remote I\/O or network switch.<\/p>\r\n\r\n      <figure class=\"ly-fa-figure\">\r\n        <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/factory-automation-surge-entry-points-and-protection-zones.webp\" alt=\"Surge entry points and coordinated protection zones in a factory automation system\" width=\"1600\" height=\"900\" loading=\"lazy\" decoding=\"async\">\r\n        <figcaption>Typical surge entry paths and coordinated protection zones across the service entrance, factory distribution, control cabinet, PLC interfaces and outdoor field equipment.<\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-fa-entry-grid\">\r\n        <article class=\"ly-fa-entry\">\r\n          <span class=\"ly-fa-tag\">Power path<\/span>\r\n          <h3>Utility and distribution transients<\/h3>\r\n          <p>Lightning-induced surges, grid switching, fault clearing and upstream load changes can enter through the low-voltage supply.<\/p>\r\n        <\/article>\r\n        <article class=\"ly-fa-entry\">\r\n          <span class=\"ly-fa-tag\">Internal source<\/span>\r\n          <h3>Motors, contactors and inductive loads<\/h3>\r\n          <p>Switching devices, coils, motors and other inductive loads can create transient overvoltages inside the facility.<\/p>\r\n        <\/article>\r\n        <article class=\"ly-fa-entry\">\r\n          <span class=\"ly-fa-tag\">Control path<\/span>\r\n          <h3>24 V DC distribution<\/h3>\r\n          <p>A shared DC bus can distribute a transient to several PLC modules, relays, sensors and remote I\/O devices at once.<\/p>\r\n        <\/article>\r\n        <article class=\"ly-fa-entry\">\r\n          <span class=\"ly-fa-tag\">Field path<\/span>\r\n          <h3>Outdoor sensor and actuator cables<\/h3>\r\n          <p>Long copper runs can pick up induced energy and bring it directly to I\/O terminals, bypassing the AC-side SPD.<\/p>\r\n        <\/article>\r\n        <article class=\"ly-fa-entry\">\r\n          <span class=\"ly-fa-tag\">Data path<\/span>\r\n          <h3>RS485 and fieldbus lines<\/h3>\r\n          <p>Differential communication ports remain vulnerable to common-mode and differential-mode transients.<\/p>\r\n        <\/article>\r\n        <article class=\"ly-fa-entry\">\r\n          <span class=\"ly-fa-tag\">Network path<\/span>\r\n          <h3>Ethernet and inter-building copper<\/h3>\r\n          <p>Copper Ethernet, including PoE, can conduct surge energy between cabinets, rooms or buildings with different local potentials.<\/p>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <div class=\"ly-fa-warning\">\r\n        <p><strong>Do not confuse surge protection with EMC filtering.<\/strong> An SPD limits short-duration transient overvoltage. Filters, shielding, segregation, ferrites and cable practices address continuous or repetitive high-frequency interference. Industrial systems may require both.<\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"power-protection\">\r\n      <h2><span class=\"ez-toc-section\" id=\"3-protect-the-power-path-main-distribution-control-cabinets-and-24-v-dc\"><\/span>3. Protect the Power Path: Main Distribution, Control Cabinets and 24 V DC<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <h3>3.1 Main low-voltage service entrance<\/h3>\r\n      <p>The service entrance is the first power protection boundary. A Type 1 or Type 1+2 SPD may be required where lightning current can enter the installation\u2014for example, because of an external lightning protection system, an exposed overhead supply or the result of a formal risk assessment. Do not specify Type 1 automatically for every factory; confirm the actual installation conditions and local rules.<\/p>\r\n\r\n      <h3>3.2 Sub-distribution boards, MCCs and machine panels<\/h3>\r\n      <p>Type 2 SPDs are commonly used downstream to limit residual incoming surges and switching transients. Selection must match the nominal voltage, earthing system, prospective short-circuit current, required backup protection, U<sub>c<\/sub>, U<sub>p<\/sub>, discharge ratings and the coordination instructions of the selected SPD family.<\/p>\r\n\r\n      <h3>3.3 Control-cabinet AC incoming feed<\/h3>\r\n      <p>A local cabinet SPD can reduce the voltage reaching the control power supply, PLC and HMI, especially when the cabinet is remote from the upstream distribution SPD. The exact device may be Type 2, Type 2+3 or Type 3 depending on upstream protection, cable distance, equipment withstand and manufacturer coordination data.<\/p>\r\n\r\n      <h3>3.4 24 V DC control power<\/h3>\r\n      <p>Many automation systems convert AC to 24 V DC, but the DC side still needs its own review. The correct device depends on whether the circuit is a higher-current DC power feeder or a low-current signal loop.<\/p>\r\n\r\n      <div class=\"ly-fa-card-grid\">\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">Parallel protection<\/span>\r\n          <h3>24 V DC power bus<\/h3>\r\n          <p>For a PLC or control-power distribution bus, confirm maximum continuous DC voltage, polarity, grounding arrangement, prospective fault current, operating temperature, U<sub>p<\/sub>, discharge capability and backup protection. General DC power SPDs are covered by IEC 61643-41:2025.<a class=\"ly-fa-ref\" href=\"#ref-3\" aria-label=\"Reference 3\">[3]<\/a><\/p>\r\n        <\/article>\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">Series protection<\/span>\r\n          <h3>24 V signal or sensor loop<\/h3>\r\n          <p>A signal-line SPD is normally inserted in the signal path. It must also be checked for rated current, series resistance, voltage drop, leakage current, capacitance, line configuration and signal bandwidth under IEC 61643-21 and its application principles.<a class=\"ly-fa-ref\" href=\"#ref-4\" aria-label=\"Reference 4\">[4]<\/a><a class=\"ly-fa-ref\" href=\"#ref-5\" aria-label=\"Reference 5\">[5]<\/a><\/p>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <div class=\"ly-fa-warning\">\r\n        <p><strong>Important VFD distinction:<\/strong> do not place a standard power SPD on a VFD motor output unless the drive and SPD manufacturers explicitly approve that application. PWM-related motor overvoltage is normally addressed with correct motor cable, grounding, output reactors, sine-wave filters or dV\/dt filters. The cabinet supply side and control circuits remain separate surge-protection tasks.<\/p>\r\n      <\/div>\r\n\r\n      <p>For detailed upstream selection, see the <a href=\"https:\/\/www.cnspd.com\/spd-selection-guide\/\" target=\"_blank\" rel=\"noopener\">SPD Selection Guide<\/a>, <a href=\"https:\/\/www.cnspd.com\/spd-uc-selection-guide\/\" target=\"_blank\" rel=\"noopener\">SPD Uc Selection Guide<\/a> and <a href=\"https:\/\/www.cnspd.com\/spd-up-voltage-protection-level\/\" target=\"_blank\" rel=\"noopener\">SPD Up Voltage Protection Level Guide<\/a>.<\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"io-protection\">\r\n      <h2><span class=\"ez-toc-section\" id=\"4-plc-io-4%e2%80%9320-ma-and-sensor-line-protection\"><\/span>4. PLC I\/O, 4\u201320 mA and Sensor-Line Protection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>PLC surge protection is not one product category with one universal voltage. The circuit function determines whether the protected path needs a power SPD, signal SPD or protocol-compatible data SPD.<\/p>\r\n\r\n      <div class=\"ly-fa-table-wrap\" role=\"region\" aria-label=\"PLC I\/O surge protection selection table\" tabindex=\"0\">\r\n        <table class=\"ly-fa-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Interface<\/th>\r\n              <th>Typical use<\/th>\r\n              <th>Confirm before selecting<\/th>\r\n              <th>Common mistake<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>24 V digital input<\/td>\r\n              <td>Limit switches, proximity sensors, dry-contact circuits<\/td>\r\n              <td>Line count, common reference, maximum normal voltage, input current, U<sub>p<\/sub>, grounding<\/td>\r\n              <td>Using a low-voltage data SPD that cannot carry the circuit current<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>24 V digital output<\/td>\r\n              <td>Relays, solenoids, valve coils and indicator circuits<\/td>\r\n              <td>Load current, inductive load suppression, line configuration, voltage drop, follow current<\/td>\r\n              <td>Expecting the SPD to replace a flyback diode, RC snubber or coil suppression<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>4\u201320 mA analog loop<\/td>\r\n              <td>Pressure, level, flow and temperature transmitters<\/td>\r\n              <td>Loop voltage, rated current, series resistance, leakage, HART compatibility where required<\/td>\r\n              <td>Selecting only by \u201c24 V\u201d and ignoring loop accuracy or communication overlay<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>RTD \/ thermocouple<\/td>\r\n              <td>Temperature measurement<\/td>\r\n              <td>Wire count, sensor type, measurement accuracy, low leakage and low thermal EMF requirements<\/td>\r\n              <td>Using a protector that adds unacceptable measurement error<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Pulse \/ frequency input<\/td>\r\n              <td>Encoders, flow pulses and counters<\/td>\r\n              <td>Signal amplitude, pulse frequency, capacitance, insertion loss and shield connection<\/td>\r\n              <td>Choosing a device with insufficient bandwidth<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Remote I\/O trunk<\/td>\r\n              <td>Distributed I\/O stations and field junction boxes<\/td>\r\n              <td>Power and data paths separately, cable route, outdoor exposure, local bonding and both endpoints<\/td>\r\n              <td>Protecting the control-room end but leaving the remote end exposed<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <h3>Where should signal SPDs be installed?<\/h3>\r\n      <p>Install them where the field cable enters the cabinet or crosses a lightning protection zone boundary, with a short connection to the local bonding system. For exposed field devices or long external cables, protection may be required at both the control-system end and the field-device end. The two devices must be coordinated and compatible with the circuit.<a class=\"ly-fa-ref\" href=\"#ref-5\" aria-label=\"Reference 5\">[5]<\/a><a class=\"ly-fa-ref\" href=\"#ref-8\" aria-label=\"Reference 8\">[8]<\/a><\/p>\r\n\r\n      <div class=\"ly-fa-success\">\r\n        <p><strong>Practical panel-building rule:<\/strong> place the signal SPD near the cable-entry terminal section, not deep inside the cabinet beside the PLC after the unprotected cable has already crossed the cabinet.<\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"network-protection\">\r\n      <h2><span class=\"ez-toc-section\" id=\"5-rs485-modbus-fieldbus-and-industrial-ethernet-protection\"><\/span>5. RS485, Modbus, Fieldbus and Industrial Ethernet Protection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <h3>5.1 RS485 and Modbus RTU<\/h3>\r\n      <p>RS485 and Modbus RTU use low-voltage differential signalling. The protector must be designed for the actual interface\u2014not merely described as a \u201c24 V SPD.\u201d Confirm the working voltage, number of conductors, shield arrangement, data rate, capacitance, insertion loss and permissible residual voltage.<\/p>\r\n      <p>Install protection at exposed cable entry points and at endpoints that sit in different protection zones or local earth environments. Keep the RS485 termination and biasing design unchanged unless the network engineer approves a modification. An SPD does not replace correct termination, shielding or equipotential bonding.<\/p>\r\n\r\n      <h3>5.2 CAN, PROFIBUS and other fieldbus systems<\/h3>\r\n      <p>Protocol-compatible protection is essential. A device that works on a slow analog loop may distort a higher-frequency fieldbus. Check the manufacturer\u2019s protocol approval or published transmission parameters rather than selecting only by connector shape.<\/p>\r\n\r\n      <h3>5.3 Industrial Ethernet, PROFINET, EtherNet\/IP and Modbus TCP<\/h3>\r\n      <p>For copper Ethernet, confirm the supported category and data rate, shield continuity, connection method and PoE class. IEC 61643-21:2025 explicitly includes telecommunications and signalling networks that may carry power on the same line, such as PoE.<a class=\"ly-fa-ref\" href=\"#ref-4\" aria-label=\"Reference 4\">[4]<\/a><\/p>\r\n\r\n      <div class=\"ly-fa-card-grid\">\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">Copper network<\/span>\r\n          <h3>When protection is especially important<\/h3>\r\n          <p>Review copper links that leave a cabinet, run outdoors, cross buildings, approach roof-mounted equipment, connect remote cameras or pass between areas with different local bonding conditions.<\/p>\r\n        <\/article>\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">Design alternative<\/span>\r\n          <h3>Use fiber where practical<\/h3>\r\n          <p>An optical-fiber link removes the conductive surge path between network nodes. Power supplies at each end still require local surge protection, but the data link itself no longer conducts lightning or ground-potential surge current.<\/p>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <p>For the RS485 subtopic, see the dedicated <a href=\"https:\/\/www.cnspd.com\/rs485-spd-guide\/\" target=\"_blank\" rel=\"noopener\">RS485 SPD Wiring and Selection Guide<\/a>.<\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"selection-matrix\">\r\n      <h2><span class=\"ez-toc-section\" id=\"6-spd-selection-matrix-by-cabinet-and-interface\"><\/span>6. SPD Selection Matrix by Cabinet and Interface<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>This matrix is designed for project scoping and BOM preparation. It does not replace detailed product selection.<\/p>\r\n\r\n      <figure class=\"ly-fa-figure\">\r\n        <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/factory-automation-spd-oem-selection-checklist.webp\" alt=\"OEM selection checklist for factory automation surge protection by cabinet, voltage and signal type\" width=\"1600\" height=\"900\" loading=\"lazy\" decoding=\"async\">\r\n        <figcaption>Use this cabinet-and-interface checklist to organize AC power, 24 V DC, PLC I\/O, industrial communication and outdoor-line protection before requesting a project quotation.<\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-fa-table-wrap\" role=\"region\" aria-label=\"Factory automation SPD selection matrix\" tabindex=\"0\">\r\n        <table class=\"ly-fa-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Protection point<\/th>\r\n              <th>Typical equipment<\/th>\r\n              <th>Protection family<\/th>\r\n              <th>Key parameters to confirm<\/th>\r\n              <th>Applicable reference<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>Main LV switchboard<\/td>\r\n              <td>Factory service entrance<\/td>\r\n              <td>Type 1, Type 1+2 or Type 2 according to risk and installation<\/td>\r\n              <td>System voltage, TN\/TT\/IT arrangement, I<sub>imp<\/sub>\/I<sub>n<\/sub>\/I<sub>max<\/sub>, U<sub>c<\/sub>, U<sub>p<\/sub>, SCCR\/backup protection<\/td>\r\n              <td>IEC 61643-11; IEC 60364 and local rules<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Sub-distribution \/ MCC<\/td>\r\n              <td>Motor feeders, machine circuits, shop-floor boards<\/td>\r\n              <td>Coordinated Type 2 power SPD<\/td>\r\n              <td>Residual protection level, cable distance, earthing, backup fuse or MCB, remote contact<\/td>\r\n              <td>IEC 61643-11<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Control-cabinet AC input<\/td>\r\n              <td>PLC PSU, HMI, IPC, relays<\/td>\r\n              <td>Type 2, Type 2+3 or Type 3 as coordinated<\/td>\r\n              <td>Incoming voltage, upstream SPD, equipment withstand, installation lead length and available space<\/td>\r\n              <td>IEC 61643-11<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>24 V DC control bus<\/td>\r\n              <td>PLC, HMI, remote I\/O and relay supply<\/td>\r\n              <td>DC power SPD<\/td>\r\n              <td>Maximum normal voltage, current, polarity, grounding, U<sub>p<\/sub>, fault current and backup protection<\/td>\r\n              <td>IEC 61643-41:2025<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>4\u201320 mA \/ analog loop<\/td>\r\n              <td>Transmitters and analog input cards<\/td>\r\n              <td>Signal-line SPD<\/td>\r\n              <td>Loop voltage\/current, line count, series resistance, leakage, HART compatibility, field-end protection<\/td>\r\n              <td>IEC 61643-21 and IEC 61643-22<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Digital I\/O<\/td>\r\n              <td>Sensors, switches, solenoids and relay interfaces<\/td>\r\n              <td>Signal or control-line SPD<\/td>\r\n              <td>Common\/floating circuit, current, voltage drop, inductive suppression and wiring topology<\/td>\r\n              <td>IEC 61643-21 and IEC 61643-22<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>RS485 \/ Modbus RTU<\/td>\r\n              <td>PLC, meter, gateway and remote I\/O<\/td>\r\n              <td>Low-capacitance differential data SPD<\/td>\r\n              <td>Working voltage, data rate, A\/B\/COM\/shield arrangement, grounding and endpoint placement<\/td>\r\n              <td>IEC 61643-21 and IEC 61643-22<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Industrial Ethernet \/ PoE<\/td>\r\n              <td>Switches, PLC ports, cameras, gateways and IPCs<\/td>\r\n              <td>RJ45 or DIN-rail network SPD<\/td>\r\n              <td>10\/100\/1000 Mbps or higher, cable category, PoE type, shield, insertion loss and grounding<\/td>\r\n              <td>IEC 61643-21:2025<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Outdoor field device<\/td>\r\n              <td>Roof, tank farm, gate, water system or remote machine<\/td>\r\n              <td>Local power and signal protection<\/td>\r\n              <td>IP rating, temperature, cable exposure, enclosure, local bonding and coordinated protection at both ends<\/td>\r\n              <td>IEC 62305 LPZ concept; relevant SPD product standards<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"ly-fa-note\">\r\n        <p><strong>Selection sequence:<\/strong> first identify the circuit; then identify the maximum normal operating conditions; then define the equipment withstand and required U<sub>p<\/sub>; only after that should you compare surge-current ratings, mounting format and optional features.<\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"example-schedule\">\r\n      <h2><span class=\"ez-toc-section\" id=\"7-example-protection-schedule-for-one-plc-control-cabinet\"><\/span>7. Example Protection Schedule for One PLC Control Cabinet<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <span class=\"ly-fa-example-label\">Engineering example \u2014 not a universal specification<\/span>\r\n      <p>This example shows how a system integrator can convert a cabinet drawing into a preliminary protection schedule. It is intended to demonstrate the selection process, not to prescribe fixed SPD ratings for every factory.<\/p>\r\n\r\n      <div class=\"ly-fa-table-wrap\" role=\"region\" aria-label=\"Example PLC cabinet surge protection schedule\" tabindex=\"0\">\r\n        <table class=\"ly-fa-table\">\r\n          <thead>\r\n            <tr>\r\n              <th>Circuit<\/th>\r\n              <th>Example interface<\/th>\r\n              <th>Example quantity<\/th>\r\n              <th>Protection requirement<\/th>\r\n              <th>Final data still required<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n          <tbody>\r\n            <tr>\r\n              <td>Cabinet incoming power<\/td>\r\n              <td>230 V AC, single phase<\/td>\r\n              <td>1 circuit<\/td>\r\n              <td>Coordinated AC power SPD at the cabinet entry<\/td>\r\n              <td>Earthing system, upstream SPD, U<sub>c<\/sub>, U<sub>p<\/sub>, short-circuit level and backup protection<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>PLC control-power bus<\/td>\r\n              <td>24 V DC, 10 A<\/td>\r\n              <td>1 bus<\/td>\r\n              <td>DC power SPD suitable for the maximum normal voltage and load arrangement<\/td>\r\n              <td>Maximum DC voltage, grounding, fault current, allowed voltage drop and installation temperature<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Analog transmitters<\/td>\r\n              <td>4\u201320 mA, two-wire<\/td>\r\n              <td>8 loops<\/td>\r\n              <td>Low-resistance signal SPDs, with field-end protection reviewed for exposed cables<\/td>\r\n              <td>Loop voltage, HART requirement, shield connection, cable route and transmitter location<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Digital field inputs<\/td>\r\n              <td>24 V DC proximity sensors<\/td>\r\n              <td>12 channels<\/td>\r\n              <td>Signal\/control-line protection matched to the common and current arrangement<\/td>\r\n              <td>PNP\/NPN topology, current, common reference, cable exposure and acceptable residual voltage<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Remote meter network<\/td>\r\n              <td>RS485 \/ Modbus RTU<\/td>\r\n              <td>1 bus<\/td>\r\n              <td>Low-capacitance differential data SPD at exposed endpoints<\/td>\r\n              <td>A\/B\/COM\/shield arrangement, data rate, cable length, grounding and endpoint locations<\/td>\r\n            <\/tr>\r\n            <tr>\r\n              <td>Outdoor network link<\/td>\r\n              <td>1 Gbps Ethernet with PoE<\/td>\r\n              <td>1 link<\/td>\r\n              <td>Gigabit and PoE-compatible network SPD, or fiber conversion where practical<\/td>\r\n              <td>PoE class, cable category, shield, outdoor route, connector and local bonding<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"ly-fa-warning\">\r\n        <p><strong>Example only:<\/strong> the final SPD model and rating depend on the actual single-line diagram, normal operating conditions, equipment withstand, cable exposure, local standards and manufacturer coordination data.<\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"leeyee-support\">\r\n      <h2><span class=\"ez-toc-section\" id=\"8-what-leeyee-can-support-for-factory-automation-projects\"><\/span>8. What LEEYEE Can Support for Factory Automation Projects<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>LEEYEE is a specialized surge protection and low-voltage protection supplier. For factory automation projects, the practical starting point is to separate confirmed standard power-SPD requirements from interface-specific signal and network requirements that need technical review.<\/p>\r\n\r\n      <div class=\"ly-fa-card-grid\">\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">Power protection<\/span>\r\n          <h3>AC distribution and control-cabinet SPDs<\/h3>\r\n          <p>Project matching can cover service entrance, sub-distribution, machine panels and cabinet incoming power according to the voltage, earthing system, installation category and required certification.<\/p>\r\n          <span class=\"ly-fa-capability-status\">Project selection supported<\/span>\r\n        <\/article>\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">DC protection<\/span>\r\n          <h3>Low-voltage DC power circuits<\/h3>\r\n          <p>Selection requires the nominal and maximum DC voltage, load current, grounding arrangement, prospective fault current, required U<sub>p<\/sub> and mounting conditions.<\/p>\r\n          <span class=\"ly-fa-capability-status\">Project selection supported<\/span>\r\n        <\/article>\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">Signal interfaces<\/span>\r\n          <h3>PLC I\/O, 4\u201320 mA and sensor lines<\/h3>\r\n          <p>Availability and matching must be confirmed from the exact interface data, including line count, current, series resistance, leakage, bandwidth, shielding and field exposure.<\/p>\r\n          <span class=\"ly-fa-capability-status ly-fa-confirm\">Technical confirmation required<\/span>\r\n        <\/article>\r\n        <article class=\"ly-fa-card\">\r\n          <span class=\"ly-fa-tag\">Industrial networks<\/span>\r\n          <h3>RS485, Modbus, Ethernet and PoE<\/h3>\r\n          <p>Protocol, working voltage, data rate, conductor arrangement, PoE class, connector, cable category and grounding must be reviewed before a compatible device is proposed.<\/p>\r\n          <span class=\"ly-fa-capability-status ly-fa-confirm\">Technical confirmation required<\/span>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <h3>OEM and documentation support<\/h3>\r\n      <p>For confirmed products and quantities, project discussions can include private labeling, packaging, datasheets, wiring information, sample approval and production scheduling. Availability depends on the selected product family and target-market certification requirements.<\/p>\r\n\r\n      <div class=\"ly-fa-note\">\r\n        <p><strong>Best inquiry format:<\/strong> send the cabinet single-line diagram plus an interface list. LEEYEE can first organize the requirements by power, DC, signal and network circuit, then confirm which items are standard, which require a different product family and which need further engineering data.<\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"installation\">\r\n      <h2><span class=\"ez-toc-section\" id=\"9-installation-and-coordination-rules-that-decide-real-protection\"><\/span>9. Installation and Coordination Rules That Decide Real Protection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-fa-flow\" aria-label=\"Five-step factory automation surge protection workflow\">\r\n        <div class=\"ly-fa-step\"><em>1<\/em><b>Map every conductor<\/b><span>Power, DC, I\/O, shields, networks, antennas and inter-building cables.<\/span><\/div>\r\n        <div class=\"ly-fa-step\"><em>2<\/em><b>Define zone boundaries<\/b><span>Mark service entry, distribution, cabinet, field and outdoor boundaries.<\/span><\/div>\r\n        <div class=\"ly-fa-step\"><em>3<\/em><b>Match each interface<\/b><span>Choose power or signal protection by actual circuit parameters.<\/span><\/div>\r\n        <div class=\"ly-fa-step\"><em>4<\/em><b>Coordinate devices<\/b><span>Check upstream\/downstream SPD coordination and equipment withstand.<\/span><\/div>\r\n        <div class=\"ly-fa-step\"><em>5<\/em><b>Verify installation<\/b><span>Inspect lead length, bonding, routing, backup protection and status monitoring.<\/span><\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-fa-do-dont\">\r\n        <div class=\"ly-fa-do\">\r\n          <h3>Do<\/h3>\r\n          <ul>\r\n            <li>Keep SPD conductors short, direct and free of unnecessary loops.<\/li>\r\n            <li>Bond to the local PE or equipotential bar with a suitable conductor.<\/li>\r\n            <li>Separate protected wiring from unprotected incoming wiring.<\/li>\r\n            <li>Place signal protection near the cable-entry terminal section.<\/li>\r\n            <li>Use the manufacturer\u2019s specified backup fuse or MCB arrangement.<\/li>\r\n            <li>Confirm remote-status contact logic before wiring it to PLC monitoring.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n        <div class=\"ly-fa-dont\">\r\n          <h3>Do Not<\/h3>\r\n          <ul>\r\n            <li>Assume a main-board SPD protects PLC signal ports.<\/li>\r\n            <li>Choose a signal SPD by nominal voltage alone.<\/li>\r\n            <li>Mix a protected conductor back beside an unprotected cable.<\/li>\r\n            <li>Use a standard AC\/DC power SPD on a data interface.<\/li>\r\n            <li>Use an SPD to solve normal VFD output PWM overvoltage or EMC noise.<\/li>\r\n            <li>Daisy-chain a long earth path through unrelated cabinet devices.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <h3>Remote monitoring and maintenance<\/h3>\r\n      <p>For unmanned or critical cabinets, specify visual status indication and a volt-free remote contact where available. Connect the contact to the PLC or monitoring system with clear alarm logic, and include inspection after major electrical events and during scheduled maintenance.<\/p>\r\n      <p>See <a href=\"https:\/\/www.cnspd.com\/spd-remote-alarm-plc\/\" target=\"_blank\" rel=\"noopener\">How to Connect an SPD Remote Alarm Contact to a PLC<\/a> and <a href=\"https:\/\/www.cnspd.com\/spd-failure-causes\/\" target=\"_blank\" rel=\"noopener\">Common Causes of SPD Failure<\/a>.<\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"ordering\">\r\n      <h2><span class=\"ez-toc-section\" id=\"10-oem-and-project-ordering-checklist\"><\/span>10. OEM and Project Ordering Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>A request such as \u201cSPD for PLC cabinet\u201d is not enough for reliable selection. Send the project information in groups so the supplier can build a cabinet-by-cabinet protection schedule.<\/p>\r\n\r\n      <div class=\"ly-fa-check-grid\">\r\n        <article class=\"ly-fa-check-card\">\r\n          <h3>Power system<\/h3>\r\n          <ul>\r\n            <li>Nominal AC voltage and frequency<\/li>\r\n            <li>Single-phase or three-phase<\/li>\r\n            <li>TN-S, TN-C-S, TT or IT<\/li>\r\n            <li>External LPS or overhead supply<\/li>\r\n            <li>Prospective short-circuit current<\/li>\r\n            <li>Upstream fuse or MCB details<\/li>\r\n          <\/ul>\r\n        <\/article>\r\n        <article class=\"ly-fa-check-card\">\r\n          <h3>DC control circuits<\/h3>\r\n          <ul>\r\n            <li>Nominal and maximum DC voltage<\/li>\r\n            <li>Maximum load current<\/li>\r\n            <li>Positive, negative or floating grounding<\/li>\r\n            <li>Power bus or signal loop<\/li>\r\n            <li>Number of protected circuits<\/li>\r\n            <li>Allowed voltage drop<\/li>\r\n          <\/ul>\r\n        <\/article>\r\n        <article class=\"ly-fa-check-card\">\r\n          <h3>Signal and network<\/h3>\r\n          <ul>\r\n            <li>DI, DO, AI, AO, pulse or sensor type<\/li>\r\n            <li>4\u201320 mA, HART, RTD or thermocouple<\/li>\r\n            <li>RS485, Modbus, CAN or PROFIBUS<\/li>\r\n            <li>Ethernet speed and cable category<\/li>\r\n            <li>PoE requirement<\/li>\r\n            <li>Wire count, shield and connector<\/li>\r\n          <\/ul>\r\n        <\/article>\r\n        <article class=\"ly-fa-check-card\">\r\n          <h3>Installation environment<\/h3>\r\n          <ul>\r\n            <li>Indoor or outdoor<\/li>\r\n            <li>Cable length and route<\/li>\r\n            <li>Inter-building or same-building link<\/li>\r\n            <li>Temperature and humidity<\/li>\r\n            <li>DIN-rail space<\/li>\r\n            <li>Required enclosure or IP rating<\/li>\r\n          <\/ul>\r\n        <\/article>\r\n        <article class=\"ly-fa-check-card\">\r\n          <h3>Maintenance features<\/h3>\r\n          <ul>\r\n            <li>Pluggable or fixed module<\/li>\r\n            <li>Visual status indication<\/li>\r\n            <li>Remote alarm contact<\/li>\r\n            <li>Disconnect\/test function<\/li>\r\n            <li>Spare module quantity<\/li>\r\n            <li>Replacement access requirements<\/li>\r\n          <\/ul>\r\n        <\/article>\r\n        <article class=\"ly-fa-check-card\">\r\n          <h3>Commercial requirements<\/h3>\r\n          <ul>\r\n            <li>Cabinet quantity and annual forecast<\/li>\r\n            <li>Required standards or certificates<\/li>\r\n            <li>OEM label and packaging<\/li>\r\n            <li>Datasheet and wiring diagram<\/li>\r\n            <li>Sample approval process<\/li>\r\n            <li>Target delivery schedule<\/li>\r\n          <\/ul>\r\n        <\/article>\r\n      <\/div>\r\n\r\n      <div class=\"ly-fa-quote-box\">\r\n        <div>\r\n          <h3>Fastest way to request project matching<\/h3>\r\n          <p>Send one cabinet drawing or a simple interface list. Mark each incoming and outgoing cable, then provide:<\/p>\r\n          <ul class=\"ly-fa-quote-list\">\r\n            <li>AC system voltage<\/li>\r\n            <li>24 V DC load current<\/li>\r\n            <li>PLC I\/O types<\/li>\r\n            <li>Communication protocols<\/li>\r\n            <li>Outdoor cable lengths<\/li>\r\n            <li>Cabinet quantities<\/li>\r\n            <li>Required certificates<\/li>\r\n            <li>OEM requirements<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n        <div class=\"ly-fa-mini-form\">\r\n          <b>Need a cabinet-by-cabinet SPD list?<\/b>\r\n          <p>LEEYEE can review your power and signal interfaces and help organize a preliminary protection schedule for technical confirmation.<\/p>\r\n          <div class=\"ly-fa-btn-row\">\r\n            <button type=\"button\" class=\"ly-fa-btn leeyee-site-popup-btn\" aria-label=\"Request factory automation SPD selection support\"><span class=\"ly-fa-popup-label\">Request Selection Support<\/span><\/button>\r\n            <a href=\"https:\/\/www.cnspd.com\/resources\/technical-downloads\/\" target=\"_blank\" rel=\"noopener\" class=\"ly-fa-btn ly-fa-btn-light\"><span class=\"w-btn-label\">Technical Downloads<\/span><\/a>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\" id=\"faq\">\r\n      <h2><span class=\"ez-toc-section\" id=\"11-frequently-asked-questions\"><\/span>11. Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <div class=\"ly-fa-faq\">\r\n        <details>\r\n          <summary>Does a PLC control cabinet need surge protection?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>It should be assessed whenever the cabinet is connected to an external power system, long field cables, remote sensors, motors, VFDs or copper communication networks. Protection normally covers the cabinet AC input, the DC control supply and exposed signal or data paths separately.<\/p><\/div>\r\n        <\/details>\r\n        <details>\r\n          <summary>Is an SPD in the main distribution board enough to protect the PLC?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>No. It can reduce surges entering through the power system, but it cannot stop a transient arriving through PLC I\/O, RS485, Ethernet, sensor cables or another conductive path that bypasses the distribution board.<\/p><\/div>\r\n        <\/details>\r\n        <details>\r\n          <summary>Where should a 24 V DC SPD be installed?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>For a DC power bus, install the selected device close to the protected distribution point or equipment while following its wiring and backup-protection instructions. For a 24 V signal loop, use a signal SPD at the cable-entry or zone boundary and check current, resistance, leakage and bandwidth.<\/p><\/div>\r\n        <\/details>\r\n        <details>\r\n          <summary>Should RS485 surge protection be installed at both ends?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>Often yes for exposed, outdoor, inter-building or long links, because each endpoint may sit in a different electromagnetic or bonding environment. The final decision should follow the risk assessment, cable route and equipment arrangement. Both devices must be system-compatible and correctly bonded.<\/p><\/div>\r\n        <\/details>\r\n        <details>\r\n          <summary>Can the same SPD protect 4\u201320 mA, digital I\/O and RS485?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>Not automatically. These circuits have different operating voltages, currents, bandwidths, line configurations and acceptable insertion characteristics. Use a device specifically selected for each interface.<\/p><\/div>\r\n        <\/details>\r\n        <details>\r\n          <summary>Does an Ethernet surge protector reduce network speed?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>A correctly selected network SPD should support the required Ethernet category and data rate with published insertion-loss and transmission performance. A mismatched or low-bandwidth device can reduce link quality, so confirm 100 Mbps, 1 Gbps, 10 Gbps and PoE compatibility as applicable.<\/p><\/div>\r\n        <\/details>\r\n        <details>\r\n          <summary>Can an SPD solve VFD interference problems?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>Not by itself. An SPD limits transient overvoltage. VFD-related EMC problems may require shielded motor cable, correct bonding, cable segregation, filters, reactors, ferrites or changes to the drive installation. Treat surge protection and EMC control as coordinated but separate tasks.<\/p><\/div>\r\n        <\/details>\r\n        <details>\r\n          <summary>What information should a panel builder send for SPD selection?<\/summary>\r\n          <div class=\"ly-fa-faq-answer\"><p>Send the single-line diagram, AC voltage and earthing system, DC bus voltage and current, I\/O list, communication protocols, cable lengths and routes, outdoor exposure, cabinet quantity, available DIN-rail space, required certifications and OEM requirements.<\/p><\/div>\r\n        <\/details>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section\">\r\n      <h2><span class=\"ez-toc-section\" id=\"related-engineering-guides\"><\/span>Related Engineering Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <div class=\"ly-fa-related\">\r\n        <a href=\"https:\/\/www.cnspd.com\/rs485-spd-guide\/\" target=\"_blank\" rel=\"noopener\"><b>RS485 SPD Wiring and Selection<\/b><span>Protocol-specific protection, grounding and installation for RS485 and Modbus networks.<\/span><\/a>\r\n        <a href=\"https:\/\/www.cnspd.com\/vfd-surge-protection\/\" target=\"_blank\" rel=\"noopener\"><b>VFD Surge Protection Guide<\/b><span>Separate supply-side surge protection from output-side PWM and dV\/dt problems.<\/span><\/a>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-remote-alarm-plc\/\" target=\"_blank\" rel=\"noopener\"><b>SPD Remote Alarm to PLC<\/b><span>Wire status contacts into PLC or building monitoring systems.<\/span><\/a>\r\n        <a href=\"https:\/\/www.cnspd.com\/three-phase-spd-wiring-diagram\/\" target=\"_blank\" rel=\"noopener\"><b>Three-Phase SPD Wiring<\/b><span>Panel-builder guidance for three-phase power protection connections.<\/span><\/a>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-up-voltage-protection-level\/\" target=\"_blank\" rel=\"noopener\"><b>SPD Up Protection Level<\/b><span>Match the SPD residual voltage to downstream equipment withstand.<\/span><\/a>\r\n        <a href=\"https:\/\/www.cnspd.com\/spd-failure-causes\/\" target=\"_blank\" rel=\"noopener\"><b>Common Causes of SPD Failure<\/b><span>TOV, wrong Uc, wiring, backup protection, heat and repeated surge stress.<\/span><\/a>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-section ly-fa-references\" aria-labelledby=\"ly-fa-references-heading\">\r\n      <h2 id=\"ly-fa-references-heading\"><span class=\"ez-toc-section\" id=\"technical-references\"><\/span>Technical References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <ol>\r\n        <li id=\"ref-1\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\" target=\"_blank\" rel=\"noopener\">IEC 61643-01:2024<\/a> \u2014 Common requirements for low-voltage surge protective devices.<\/li>\r\n        <li id=\"ref-2\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener\">IEC 61643-11:2025<\/a> \u2014 SPDs connected to AC low-voltage power systems.<\/li>\r\n        <li id=\"ref-3\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/27917\" target=\"_blank\" rel=\"noopener\">IEC 61643-41:2025<\/a> \u2014 SPDs connected to DC low-voltage power systems.<\/li>\r\n        <li id=\"ref-4\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\" target=\"_blank\" rel=\"noopener\">IEC 61643-21:2025<\/a> \u2014 SPDs for telecommunications and signalling networks, including powered data lines such as PoE.<\/li>\r\n        <li id=\"ref-5\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/22772\" target=\"_blank\" rel=\"noopener\">IEC 61643-22:2015<\/a> \u2014 Selection and application principles for telecommunications and signalling network SPDs.<\/li>\r\n        <li id=\"ref-6\"><a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/process-safety-automation-test-and-measurement\/crouse-hinds\/mtl\/content\/Eaton%20Whitepaper%20-%20Protecting%20Against%20Electrical%20Surge%20in%20Industrial%20Applications.pdf\" target=\"_blank\" rel=\"noopener\">Eaton \/ MTL: Protecting Against Electrical Surge in Industrial Applications<\/a> \u2014 LPZ, equipotential bonding, power and signal protection principles.<\/li>\r\n        <li id=\"ref-7\"><a href=\"https:\/\/www.citel.us\/en\/surge-protection-for-programmable-logic-controller\" target=\"_blank\" rel=\"noopener\">CITEL: Surge Protection for Programmable Logic Controllers<\/a> \u2014 PLC power, I\/O and network entry paths.<\/li>\r\n        <li id=\"ref-8\"><a href=\"https:\/\/www.phoenixcontact.com\/en-pc\/products\/surge-protection\/surge-protection-for-mcr-technology-and-signals\" target=\"_blank\" rel=\"noopener\">Phoenix Contact: Surge Protection for MCR Technology and Signals<\/a> \u2014 interface-specific protection for analog and digital field circuits.<\/li>\r\n        <li id=\"ref-9\"><a href=\"https:\/\/www.phoenixcontact.com\/en-pc\/products\/surge-protection\/surge-protection-for-information-technology\" target=\"_blank\" rel=\"noopener\">Phoenix Contact: Surge Protection for Information Technology<\/a> \u2014 Ethernet, RS485 and high-speed network protection.<\/li>\r\n        <li id=\"ref-10\"><a href=\"https:\/\/literature.rockwellautomation.com\/idc\/groups\/literature\/documents\/wp\/4983-wp001_-en-d.pdf\" target=\"_blank\" rel=\"noopener\">Rockwell Automation Bulletin 4983 White Paper<\/a> \u2014 surge and filter protection devices and industrial applications.<\/li>\r\n      <\/ol>\r\n      <p class=\"ly-fa-footnote\">Engineering note: standards and local electrical rules can change. Confirm the current edition, national adoption and product certification requirements for the project market before final specification.<\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-fa-final-cta\" aria-labelledby=\"ly-fa-final-cta-heading\">\r\n      <h2 id=\"ly-fa-final-cta-heading\"><span class=\"ez-toc-section\" id=\"send-the-cabinet-drawing-not-just-a-voltage\"><\/span>Send the Cabinet Drawing, Not Just a Voltage<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n      <p>A complete factory automation surge protection plan starts with the system architecture\u2014not with a single SPD model. Send the incoming power, 24 V DC distribution, I\/O list, communication interfaces and cable routes so LEEYEE can organize a preliminary cabinet-by-cabinet selection list for technical review and OEM ordering.<\/p>\r\n      <div class=\"ly-fa-btn-row\">\r\n        <button type=\"button\" class=\"ly-fa-btn leeyee-site-popup-btn\" aria-label=\"Request a factory automation surge protection quote\"><span class=\"ly-fa-popup-label\">Request a Project Quote<\/span><\/button>\r\n        <a href=\"https:\/\/www.cnspd.com\/contact\/\" target=\"_blank\" rel=\"noopener\" class=\"ly-fa-btn ly-fa-btn-light\"><span class=\"w-btn-label\">Contact LEEYEE<\/span><\/a>\r\n      <\/div>\r\n    <\/section>\r\n  <\/div>\r\n<\/article>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"Article\",\r\n  \"headline\": \"Factory Automation Surge Protection Guide\",\r\n  \"description\": \"Plan factory automation surge protection for AC power, 24V DC, PLC I\/O, sensors, RS485, Modbus, Ethernet and outdoor field cables.\",\r\n  \"image\": [\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/factory-automation-surge-protection-architecture.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/factory-automation-surge-entry-points-and-protection-zones.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/factory-automation-spd-oem-selection-checklist.webp\"\r\n  ],\r\n  \"author\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE Technical Content Team\"\r\n  },\r\n  \"reviewedBy\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE Surge Protection Engineering Team\"\r\n  },\r\n  \"publisher\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE\"\r\n  },\r\n  \"mainEntityOfPage\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/www.cnspd.com\/factory-automation-surge-protection\/\"\r\n  },\r\n  \"datePublished\": \"2026-07-15\",\r\n  \"dateModified\": \"2026-07-15\",\r\n  \"keywords\": [\r\n    \"factory automation surge protection\",\r\n    \"industrial automation surge protection\",\r\n    \"PLC surge protection\",\r\n    \"24V DC surge protection\",\r\n    \"RS485 surge protection\",\r\n    \"Modbus surge protection\",\r\n    \"industrial Ethernet surge protection\"\r\n  ],\r\n  \"about\": [\r\n    {\r\n      \"@type\": \"Thing\",\r\n      \"name\": \"Factory automation\"\r\n    },\r\n    {\r\n      \"@type\": \"Thing\",\r\n      \"name\": \"Surge protective device\"\r\n    },\r\n    {\r\n      \"@type\": \"Thing\",\r\n      \"name\": \"Programmable logic controller\"\r\n    },\r\n    {\r\n      \"@type\": \"Thing\",\r\n      \"name\": \"Industrial communication network\"\r\n    }\r\n  ]\r\n}\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Does a PLC control cabinet need surge protection?\",\r\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"It should be assessed whenever the cabinet is connected to an external power system, long field cables, remote sensors, motors, VFDs or copper communication networks. 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For a 24 V signal loop, use a signal SPD at the cable-entry or zone boundary and check current, resistance, leakage and bandwidth.\"}\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Should RS485 surge protection be installed at both ends?\",\r\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Often yes for exposed, outdoor, inter-building or long links, because each endpoint may sit in a different electromagnetic or bonding environment. The final decision should follow the risk assessment, cable route and equipment arrangement.\"}\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can the same SPD protect 4\u201320 mA, digital I\/O and RS485?\",\r\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Not automatically. These circuits have different operating voltages, currents, bandwidths, line configurations and acceptable insertion characteristics. 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This industrial automation surge protection guide coordinates protection for distribution boards, control-cabinet power, 24 V DC circuits, PLC I\/O, field instruments, RS485 or Modbus links, industrial Ethernet, and long outdoor&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-30090","post","type-post","status-publish","format-standard","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Factory Automation Surge Protection Guide | LEEYEE Electrics<\/title>\n<meta name=\"description\" content=\"Discover Factory Automation Surge Protection Guide and further information about electrical protection. 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