{"id":30155,"date":"2026-07-16T15:24:03","date_gmt":"2026-07-16T07:24:03","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30155"},"modified":"2026-07-17T16:41:56","modified_gmt":"2026-07-17T08:41:56","slug":"sensor-line-surge-protection-for-24v-4-20ma-rs485-plc-i-o","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/sensor-line-surge-protection\/","title":{"rendered":"Sensor Line Surge Protection for 24V, 4\u201320mA, RS485 &#038; PLC I\/O"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30155\" class=\"elementor elementor-30155\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9addcda e-flex e-con-boxed e-con e-parent\" data-id=\"9addcda\" 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-cb4abfa elementor-widget elementor-widget-html\" data-id=\"cb4abfa\" 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-sensor-guide,\r\n  .ly-sensor-guide * {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  .ly-sensor-guide {\r\n    --ly-blue: #004898;\r\n    --ly-blue-dark: #00356f;\r\n    --ly-blue-light: #eaf3ff;\r\n    --ly-ink: #142033;\r\n    --ly-text: #334155;\r\n    --ly-muted: #64748b;\r\n    --ly-line: #dbe4ef;\r\n    --ly-soft: #f6f9fc;\r\n    --ly-white: #ffffff;\r\n    --ly-green: #16764a;\r\n    --ly-green-light: #eaf8f1;\r\n    --ly-orange: #a8510a;\r\n    --ly-orange-light: #fff7e8;\r\n    --ly-red: #b42318;\r\n    --ly-red-light: #fff1f0;\r\n\r\n    width: 100%;\r\n    color: var(--ly-text);\r\n    font-family: Arial, Helvetica, sans-serif;\r\n    font-size: 17px;\r\n    line-height: 1.7;\r\n    container-name: ly-sensor-content;\r\n    container-type: inline-size;\r\n    overflow: hidden;\r\n  }\r\n\r\n  .ly-sensor-guide a {\r\n    color: var(--ly-blue);\r\n    text-decoration: none;\r\n  }\r\n\r\n  .ly-sensor-guide a:hover,\r\n  .ly-sensor-guide a:focus {\r\n    text-decoration: underline;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-wrap {\r\n    width: min(1160px, calc(100% - 48px));\r\n    margin: 0 auto;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-section {\r\n    padding: 72px 0;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-section-soft {\r\n    background: var(--ly-soft);\r\n  }\r\n\r\n  .ly-sensor-guide h2,\r\n  .ly-sensor-guide h3,\r\n  .ly-sensor-guide p,\r\n  .ly-sensor-guide ul,\r\n  .ly-sensor-guide ol {\r\n    margin-top: 0;\r\n  }\r\n\r\n  .ly-sensor-guide h2,\r\n  .ly-sensor-guide h3 {\r\n    color: var(--ly-ink);\r\n    font-weight: 800;\r\n    line-height: 1.22;\r\n  }\r\n\r\n  .ly-sensor-guide h2 {\r\n    margin-bottom: 18px;\r\n    font-size: 38px;\r\n    letter-spacing: -0.025em;\r\n  }\r\n\r\n  .ly-sensor-guide h3 {\r\n    margin-bottom: 10px;\r\n    font-size: 22px;\r\n  }\r\n\r\n  .ly-sensor-guide p {\r\n    margin-bottom: 16px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-lead {\r\n    max-width: 900px;\r\n    color: #27364c;\r\n    font-size: 20px;\r\n    line-height: 1.6;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-note {\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.6;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-source-mark {\r\n    white-space: nowrap;\r\n    color: var(--ly-blue);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-kicker {\r\n    display: inline-flex;\r\n    gap: 9px;\r\n    margin-bottom: 13px;\r\n    align-items: center;\r\n    color: var(--ly-blue);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.11em;\r\n    line-height: 1.3;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-kicker::before {\r\n    width: 23px;\r\n    height: 3px;\r\n    border-radius: 999px;\r\n    background: var(--ly-blue);\r\n    content: \"\";\r\n  }\r\n\r\n  .ly-sensor-guide .ly-check-list,\r\n  .ly-sensor-guide .ly-cross-list {\r\n    display: grid;\r\n    gap: 11px;\r\n    margin: 0;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-check-list li,\r\n  .ly-sensor-guide .ly-cross-list li {\r\n    position: relative;\r\n    padding-left: 29px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-check-list li::before,\r\n  .ly-sensor-guide .ly-cross-list li::before {\r\n    position: absolute;\r\n    top: 2px;\r\n    left: 0;\r\n    display: grid;\r\n    width: 20px;\r\n    height: 20px;\r\n    place-items: center;\r\n    border-radius: 50%;\r\n    font-size: 11px;\r\n    font-weight: 900;\r\n    line-height: 1;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-check-list li::before {\r\n    color: var(--ly-green);\r\n    background: var(--ly-green-light);\r\n    content: \"\u2713\";\r\n  }\r\n\r\n  .ly-sensor-guide .ly-cross-list li::before {\r\n    color: var(--ly-red);\r\n    background: var(--ly-red-light);\r\n    content: \"\u00d7\";\r\n  }\r\n\r\n  \/* Quick answer *\/\r\n\r\n  .ly-sensor-guide .ly-quick {\r\n    padding: 54px 0 60px;\r\n    border-top: 5px solid var(--ly-blue);\r\n    background:\r\n      radial-gradient(\r\n        circle at 92% 6%,\r\n        rgba(0, 72, 152, 0.12),\r\n        transparent 31%\r\n      ),\r\n      linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-quick-layout {\r\n    display: grid;\r\n    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);\r\n    gap: 28px;\r\n    align-items: stretch;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-quick-main,\r\n  .ly-sensor-guide .ly-quick-side {\r\n    min-width: 0;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 18px;\r\n    background: rgba(255, 255, 255, 0.97);\r\n    box-shadow: 0 17px 45px rgba(31, 50, 77, 0.08);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-quick-main {\r\n    padding: 36px 38px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-quick-side {\r\n    padding: 29px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-quick-side h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-answer-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 15px;\r\n    margin-top: 24px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-answer-card {\r\n    min-width: 0;\r\n    padding: 20px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 14px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-answer-card span {\r\n    display: block;\r\n    margin-bottom: 7px;\r\n    color: var(--ly-blue);\r\n    font-size: 12px;\r\n    font-weight: 900;\r\n    letter-spacing: 0.06em;\r\n    line-height: 1.4;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-answer-card strong {\r\n    display: block;\r\n    color: var(--ly-ink);\r\n    font-size: 16px;\r\n    line-height: 1.48;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-standard-row {\r\n    display: flex;\r\n    gap: 9px;\r\n    margin-top: 20px;\r\n    flex-wrap: wrap;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-standard-row span {\r\n    display: inline-flex;\r\n    padding: 6px 10px;\r\n    align-items: center;\r\n    border: 1px solid #c6d8ec;\r\n    border-radius: 999px;\r\n    color: var(--ly-blue-dark);\r\n    background: #f5f9fe;\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    line-height: 1.3;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-toc {\r\n    margin-top: 28px;\r\n    padding: 23px 26px;\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-sensor-guide .ly-toc > strong {\r\n    display: block;\r\n    margin-bottom: 11px;\r\n    color: var(--ly-ink);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-toc-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(4, minmax(0, 1fr));\r\n    gap: 9px 17px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-toc a {\r\n    display: inline-flex;\r\n    gap: 7px;\r\n    min-width: 0;\r\n    align-items: flex-start;\r\n    color: #31445e;\r\n    font-size: 14px;\r\n    font-weight: 700;\r\n    line-height: 1.45;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-toc a::before {\r\n    flex: 0 0 auto;\r\n    color: var(--ly-blue);\r\n    content: \"\u2192\";\r\n  }\r\n\r\n  \/* Media *\/\r\n\r\n  .ly-sensor-guide .ly-media {\r\n    width: 100%;\r\n    margin: 31px 0 12px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-media img {\r\n    display: block;\r\n    width: 100%;\r\n    height: auto;\r\n    aspect-ratio: 4 \/ 3;\r\n    object-fit: contain;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 17px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 15px 40px rgba(31, 50, 77, 0.08);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-media figcaption {\r\n    max-width: 940px;\r\n    margin: 12px auto 0;\r\n    color: var(--ly-muted);\r\n    font-size: 14px;\r\n    line-height: 1.55;\r\n    text-align: center;\r\n  }\r\n\r\n  \/* Product evidence *\/\r\n\r\n  .ly-sensor-guide .ly-product-layout {\r\n    display: grid;\r\n    grid-template-columns: minmax(0, 1.35fr) minmax(290px, 0.65fr);\r\n    gap: 22px;\r\n    margin-top: 28px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-product-box,\r\n  .ly-sensor-guide .ly-scope-box {\r\n    min-width: 0;\r\n    padding: 29px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 17px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 11px 30px rgba(31, 50, 77, 0.05);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-product-box {\r\n    border-top: 5px solid var(--ly-blue);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-scope-box {\r\n    border-top: 5px solid var(--ly-orange);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-scope-box h3,\r\n  .ly-sensor-guide .ly-scope-box strong {\r\n    color: #703e08;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-product-top {\r\n    display: flex;\r\n    gap: 16px;\r\n    align-items: flex-start;\r\n    justify-content: space-between;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-status {\r\n    display: inline-flex;\r\n    flex: 0 0 auto;\r\n    padding: 6px 10px;\r\n    border-radius: 999px;\r\n    color: var(--ly-green);\r\n    background: var(--ly-green-light);\r\n    font-size: 11px;\r\n    font-weight: 900;\r\n    line-height: 1.3;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-spec-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 11px;\r\n    margin: 22px 0;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-spec {\r\n    min-width: 0;\r\n    padding: 15px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 12px;\r\n    background: #f9fbfd;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-spec span {\r\n    display: block;\r\n    margin-bottom: 5px;\r\n    color: var(--ly-muted);\r\n    font-size: 11px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.04em;\r\n    line-height: 1.4;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-spec strong {\r\n    display: block;\r\n    color: var(--ly-ink);\r\n    font-size: 16px;\r\n    line-height: 1.4;\r\n  }\r\n\r\n  \/* Buttons *\/\r\n\r\n  .ly-sensor-guide .ly-actions,\r\n  .ly-sensor-guide .ly-cta-actions {\r\n    display: flex;\r\n    gap: 11px;\r\n    flex-wrap: wrap;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-btn,\r\n  .ly-sensor-guide .ly-btn {\r\n    display: inline-flex;\r\n    min-height: 46px;\r\n    padding: 11px 17px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    border: 2px solid transparent;\r\n    border-radius: 9px;\r\n    cursor: pointer;\r\n    font: inherit;\r\n    font-size: 14px;\r\n    font-weight: 800;\r\n    line-height: 1.3;\r\n    text-align: center;\r\n    transition:\r\n      transform 0.2s ease,\r\n      background 0.2s ease,\r\n      color 0.2s ease,\r\n      box-shadow 0.2s ease;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-btn > span,\r\n  .ly-sensor-guide .ly-btn > span {\r\n    position: relative;\r\n    z-index: 2;\r\n    display: block !important;\r\n    opacity: 1 !important;\r\n    color: inherit !important;\r\n    visibility: visible !important;\r\n    -webkit-text-fill-color: currentColor !important;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-btn:hover,\r\n  .ly-sensor-guide .ly-link-btn:focus,\r\n  .ly-sensor-guide .ly-btn:hover,\r\n  .ly-sensor-guide .ly-btn:focus {\r\n    text-decoration: none;\r\n    transform: translateY(-1px);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-primary {\r\n    color: #ffffff !important;\r\n    background: var(--ly-blue);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-primary > span {\r\n    color: #ffffff !important;\r\n    -webkit-text-fill-color: #ffffff !important;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-primary:hover,\r\n  .ly-sensor-guide .ly-link-primary:focus {\r\n    background: var(--ly-blue-dark);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-outline {\r\n    border-color: var(--ly-blue);\r\n    color: var(--ly-blue) !important;\r\n    background: #ffffff;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-link-outline > span {\r\n    color: var(--ly-blue) !important;\r\n    -webkit-text-fill-color: var(--ly-blue) !important;\r\n  }\r\n\r\n  \/* Tables *\/\r\n\r\n  .ly-sensor-guide .ly-table-wrap {\r\n    width: 100%;\r\n    margin-top: 27px;\r\n    overflow-x: auto;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 15px;\r\n    background: var(--ly-white);\r\n    box-shadow: 0 9px 28px rgba(31, 50, 77, 0.05);\r\n    -webkit-overflow-scrolling: touch;\r\n  }\r\n\r\n  .ly-sensor-guide table {\r\n    width: 100%;\r\n    min-width: 930px;\r\n    border-collapse: collapse;\r\n  }\r\n\r\n  .ly-sensor-guide th,\r\n  .ly-sensor-guide td {\r\n    padding: 16px 17px;\r\n    border-right: 1px solid var(--ly-line);\r\n    border-bottom: 1px solid var(--ly-line);\r\n    text-align: left;\r\n    vertical-align: top;\r\n    font-size: 15px;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .ly-sensor-guide th:last-child,\r\n  .ly-sensor-guide td:last-child {\r\n    border-right: 0;\r\n  }\r\n\r\n  .ly-sensor-guide tr:last-child td {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .ly-sensor-guide th {\r\n    color: #ffffff;\r\n    background: var(--ly-blue);\r\n    font-size: 14px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .ly-sensor-guide tbody tr:nth-child(even) td {\r\n    background: #f9fbfd;\r\n  }\r\n\r\n  .ly-sensor-guide td strong {\r\n    color: var(--ly-ink);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-mini-tag {\r\n    display: inline-block;\r\n    margin: 2px 4px 2px 0;\r\n    padding: 4px 8px;\r\n    border-radius: 999px;\r\n    color: var(--ly-blue-dark);\r\n    background: var(--ly-blue-light);\r\n    font-size: 11px;\r\n    font-weight: 800;\r\n    line-height: 1.3;\r\n  }\r\n\r\n  \/* Installation *\/\r\n\r\n  .ly-sensor-guide .ly-three-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 18px;\r\n    margin-top: 27px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-position-card,\r\n  .ly-sensor-guide .ly-term-card,\r\n  .ly-sensor-guide .ly-buyer-card {\r\n    min-width: 0;\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    box-shadow: 0 9px 26px rgba(31, 50, 77, 0.045);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-position-number {\r\n    display: grid;\r\n    width: 40px;\r\n    height: 40px;\r\n    margin-bottom: 15px;\r\n    place-items: center;\r\n    border-radius: 11px;\r\n    color: var(--ly-blue);\r\n    background: var(--ly-blue-light);\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-position-card p,\r\n  .ly-sensor-guide .ly-term-card p,\r\n  .ly-sensor-guide .ly-buyer-card p {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-decision-note {\r\n    display: grid;\r\n    grid-template-columns: auto 1fr;\r\n    gap: 17px;\r\n    margin-top: 25px;\r\n    padding: 22px 25px;\r\n    align-items: center;\r\n    border: 1px solid #f0d09c;\r\n    border-radius: 14px;\r\n    background: var(--ly-orange-light);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-decision-icon {\r\n    display: grid;\r\n    width: 48px;\r\n    height: 48px;\r\n    place-items: center;\r\n    border-radius: 50%;\r\n    color: var(--ly-orange);\r\n    background: #ffffff;\r\n    font-size: 19px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-decision-note p {\r\n    margin: 0;\r\n    color: #70400b;\r\n  }\r\n\r\n  \/* Plain language terms *\/\r\n\r\n  .ly-sensor-guide .ly-four-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 18px;\r\n    margin-top: 27px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-term-card {\r\n    border-top: 4px solid var(--ly-blue);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-term-card strong {\r\n    color: var(--ly-blue-dark);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-example {\r\n    margin-top: 13px;\r\n    padding: 13px 15px;\r\n    border-left: 4px solid #b8d3f1;\r\n    border-radius: 0 9px 9px 0;\r\n    color: #42526a;\r\n    background: #f5f9fe;\r\n    font-size: 14px;\r\n    line-height: 1.58;\r\n  }\r\n\r\n  \/* Ordering *\/\r\n\r\n  .ly-sensor-guide .ly-order-layout {\r\n    display: grid;\r\n    grid-template-columns: minmax(0, 1fr) minmax(290px, 0.55fr);\r\n    gap: 22px;\r\n    margin-top: 28px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-order-list,\r\n  .ly-sensor-guide .ly-files-box {\r\n    min-width: 0;\r\n    padding: 28px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 16px;\r\n    background: var(--ly-white);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-order-list {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 14px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-order-item {\r\n    min-width: 0;\r\n    padding: 16px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 12px;\r\n    background: #f9fbfd;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-order-item span {\r\n    display: block;\r\n    margin-bottom: 6px;\r\n    color: var(--ly-blue);\r\n    font-size: 11px;\r\n    font-weight: 900;\r\n    letter-spacing: 0.05em;\r\n    line-height: 1.35;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-order-item strong {\r\n    display: block;\r\n    margin-bottom: 5px;\r\n    color: var(--ly-ink);\r\n    font-size: 16px;\r\n    line-height: 1.4;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-order-item p {\r\n    margin: 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-sensor-guide .ly-files-box {\r\n    border-top: 5px solid var(--ly-green);\r\n  }\r\n\r\n  \/* Buyers *\/\r\n\r\n  .ly-sensor-guide .ly-buyer-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 17px;\r\n    margin-top: 26px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-buyer-card h3 {\r\n    font-size: 18px;\r\n  }\r\n\r\n  \/* CTA *\/\r\n\r\n  .ly-sensor-guide .ly-cta {\r\n    padding: 56px 0;\r\n    background:\r\n      radial-gradient(\r\n        circle at 87% 12%,\r\n        rgba(255, 255, 255, 0.14),\r\n        transparent 29%\r\n      ),\r\n      linear-gradient(135deg, var(--ly-blue-dark), var(--ly-blue));\r\n  }\r\n\r\n  .ly-sensor-guide .ly-cta-layout {\r\n    display: grid;\r\n    grid-template-columns: minmax(0, 1fr) auto;\r\n    gap: 28px;\r\n    align-items: center;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-cta-layout > div {\r\n    min-width: 0;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-cta h2,\r\n  .ly-sensor-guide .ly-cta p {\r\n    color: #ffffff;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-cta h2 {\r\n    max-width: 760px;\r\n    margin-bottom: 11px;\r\n    word-break: normal !important;\r\n    overflow-wrap: normal !important;\r\n    hyphens: none !important;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-cta p {\r\n    max-width: 760px;\r\n    margin-bottom: 0;\r\n    opacity: 0.92;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-cta-actions {\r\n    justify-content: flex-end;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-btn-primary {\r\n    color: var(--ly-blue-dark) !important;\r\n    background: #ffffff;\r\n    box-shadow: 0 9px 23px rgba(0, 0, 0, 0.13);\r\n  }\r\n\r\n  .ly-sensor-guide .ly-btn-primary > span {\r\n    color: var(--ly-blue-dark) !important;\r\n    -webkit-text-fill-color: var(--ly-blue-dark) !important;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-btn-secondary {\r\n    border-color: rgba(255, 255, 255, 0.72);\r\n    color: #ffffff !important;\r\n    background: transparent;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-btn-secondary > span {\r\n    color: #ffffff !important;\r\n    -webkit-text-fill-color: #ffffff !important;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-btn-secondary:hover,\r\n  .ly-sensor-guide .ly-btn-secondary:focus {\r\n    color: var(--ly-blue-dark) !important;\r\n    background: #ffffff;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-btn-secondary:hover > span,\r\n  .ly-sensor-guide .ly-btn-secondary:focus > span {\r\n    color: var(--ly-blue-dark) !important;\r\n    -webkit-text-fill-color: var(--ly-blue-dark) !important;\r\n  }\r\n\r\n  \/* FAQ *\/\r\n\r\n  .ly-sensor-guide .ly-faq-list {\r\n    display: grid;\r\n    gap: 13px;\r\n    margin-top: 25px;\r\n  }\r\n\r\n  .ly-sensor-guide details {\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-sensor-guide summary {\r\n    position: relative;\r\n    padding: 19px 56px 19px 22px;\r\n    color: var(--ly-ink);\r\n    cursor: pointer;\r\n    font-size: 17px;\r\n    font-weight: 800;\r\n    line-height: 1.45;\r\n    list-style: none;\r\n  }\r\n\r\n  .ly-sensor-guide summary::-webkit-details-marker {\r\n    display: none;\r\n  }\r\n\r\n  .ly-sensor-guide summary::after {\r\n    position: absolute;\r\n    top: 50%;\r\n    right: 20px;\r\n    display: grid;\r\n    width: 25px;\r\n    height: 25px;\r\n    place-items: center;\r\n    border-radius: 50%;\r\n    color: var(--ly-blue);\r\n    background: var(--ly-blue-light);\r\n    content: \"+\";\r\n    transform: translateY(-50%);\r\n  }\r\n\r\n  .ly-sensor-guide details[open] summary::after {\r\n    content: \"\u2212\";\r\n  }\r\n\r\n  .ly-sensor-guide .ly-faq-answer {\r\n    padding: 0 22px 20px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-faq-answer p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  \/* References *\/\r\n\r\n  .ly-sensor-guide .ly-references {\r\n    padding: 50px 0 64px;\r\n    background: #eef3f8;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-reference-list {\r\n    margin: 21px 0 0;\r\n    padding-left: 22px;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-reference-list li {\r\n    margin-bottom: 12px;\r\n    padding-left: 5px;\r\n    font-size: 14px;\r\n    line-height: 1.58;\r\n  }\r\n\r\n  .ly-sensor-guide .ly-reference-list a {\r\n    font-weight: 700;\r\n  }\r\n\r\n  \/* Container responsive layout *\/\r\n\r\n  @container ly-sensor-content (max-width: 1050px) {\r\n    .ly-sensor-guide .ly-quick-layout,\r\n    .ly-sensor-guide .ly-product-layout,\r\n    .ly-sensor-guide .ly-order-layout,\r\n    .ly-sensor-guide .ly-cta-layout {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-cta-actions {\r\n      justify-content: flex-start;\r\n    }\r\n  }\r\n\r\n  @container ly-sensor-content (max-width: 850px) {\r\n    .ly-sensor-guide .ly-answer-grid,\r\n    .ly-sensor-guide .ly-three-grid,\r\n    .ly-sensor-guide .ly-buyer-grid {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-four-grid {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-toc-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .ly-sensor-guide .ly-spec-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n  }\r\n\r\n  @container ly-sensor-content (max-width: 620px) {\r\n    .ly-sensor-guide .ly-toc-grid,\r\n    .ly-sensor-guide .ly-spec-grid,\r\n    .ly-sensor-guide .ly-order-list {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-actions,\r\n    .ly-sensor-guide .ly-cta-actions {\r\n      display: grid;\r\n      grid-template-columns: minmax(0, 1fr);\r\n      width: 100%;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-link-btn,\r\n    .ly-sensor-guide .ly-btn {\r\n      width: 100%;\r\n      white-space: normal;\r\n    }\r\n  }\r\n\r\n  \/* Required device breakpoints *\/\r\n\r\n  @media (max-width: 1440px) {\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: min(1140px, calc(100% - 46px));\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1366px) {\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: min(1100px, calc(100% - 42px));\r\n    }\r\n\r\n    .ly-sensor-guide .ly-section {\r\n      padding: 68px 0;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1280px) {\r\n    .ly-sensor-guide {\r\n      font-size: 16.5px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: min(1060px, calc(100% - 40px));\r\n    }\r\n\r\n    .ly-sensor-guide h2 {\r\n      font-size: 36px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1024px) {\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 36px);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-section {\r\n      padding: 60px 0;\r\n    }\r\n\r\n    .ly-sensor-guide h2 {\r\n      font-size: 33px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-lead {\r\n      font-size: 19px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-quick-layout,\r\n    .ly-sensor-guide .ly-product-layout,\r\n    .ly-sensor-guide .ly-order-layout,\r\n    .ly-sensor-guide .ly-cta-layout {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-cta-actions {\r\n      justify-content: flex-start;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 912px) {\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 34px);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-answer-grid,\r\n    .ly-sensor-guide .ly-three-grid,\r\n    .ly-sensor-guide .ly-buyer-grid {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-toc-grid {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n  }\r\n\r\n  @media (max-width: 820px) {\r\n    .ly-sensor-guide .ly-section {\r\n      padding: 55px 0;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-four-grid {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-product-top {\r\n      display: block;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-status {\r\n      margin-top: 8px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 768px) {\r\n    .ly-sensor-guide {\r\n      font-size: 16px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 30px);\r\n    }\r\n\r\n    .ly-sensor-guide h2 {\r\n      font-size: 29px;\r\n    }\r\n\r\n    .ly-sensor-guide h3 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-spec-grid,\r\n    .ly-sensor-guide .ly-order-list {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-decision-note {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-cta-actions {\r\n      display: grid;\r\n      grid-template-columns: minmax(0, 1fr);\r\n      width: 100%;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-btn {\r\n      width: 100%;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 600px) {\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 26px);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-quick {\r\n      padding: 43px 0 48px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-section {\r\n      padding: 49px 0;\r\n    }\r\n\r\n    .ly-sensor-guide h2 {\r\n      font-size: 27px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-lead {\r\n      font-size: 18px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-quick-main,\r\n    .ly-sensor-guide .ly-quick-side,\r\n    .ly-sensor-guide .ly-product-box,\r\n    .ly-sensor-guide .ly-scope-box,\r\n    .ly-sensor-guide .ly-order-list,\r\n    .ly-sensor-guide .ly-files-box {\r\n      padding: 23px;\r\n      border-radius: 14px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-toc-grid {\r\n      grid-template-columns: minmax(0, 1fr);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-media {\r\n      margin-top: 25px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-media img {\r\n      border-radius: 13px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-media figcaption {\r\n      text-align: left;\r\n    }\r\n\r\n    .ly-sensor-guide table {\r\n      min-width: 850px;\r\n    }\r\n\r\n    .ly-sensor-guide th,\r\n    .ly-sensor-guide td {\r\n      padding: 14px;\r\n      font-size: 14px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 540px) {\r\n    .ly-sensor-guide h2 {\r\n      font-size: 26px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-position-card,\r\n    .ly-sensor-guide .ly-term-card,\r\n    .ly-sensor-guide .ly-buyer-card {\r\n      padding: 21px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 480px) {\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 22px);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-section {\r\n      padding: 45px 0;\r\n    }\r\n\r\n    .ly-sensor-guide h2 {\r\n      font-size: 25px;\r\n    }\r\n\r\n    .ly-sensor-guide h3 {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-kicker {\r\n      font-size: 12px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-answer-card {\r\n      padding: 17px;\r\n    }\r\n\r\n    .ly-sensor-guide summary {\r\n      padding: 18px 51px 18px 19px;\r\n      font-size: 16px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-faq-answer {\r\n      padding: 0 19px 19px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-cta {\r\n      padding: 43px 0;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 430px) {\r\n    .ly-sensor-guide h2 {\r\n      font-size: 24px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-quick-main,\r\n    .ly-sensor-guide .ly-quick-side,\r\n    .ly-sensor-guide .ly-product-box,\r\n    .ly-sensor-guide .ly-scope-box,\r\n    .ly-sensor-guide .ly-order-list,\r\n    .ly-sensor-guide .ly-files-box {\r\n      padding: 20px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 414px) {\r\n    .ly-sensor-guide {\r\n      font-size: 15.8px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 20px);\r\n    }\r\n\r\n    .ly-sensor-guide .ly-lead {\r\n      font-size: 17px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 390px) {\r\n    .ly-sensor-guide h2 {\r\n      font-size: 23px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-position-card,\r\n    .ly-sensor-guide .ly-term-card,\r\n    .ly-sensor-guide .ly-buyer-card {\r\n      padding: 19px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 375px) {\r\n    .ly-sensor-guide .ly-section {\r\n      padding: 42px 0;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-btn,\r\n    .ly-sensor-guide .ly-link-btn {\r\n      min-height: 47px;\r\n      padding: 11px 15px;\r\n      font-size: 14px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 360px) {\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 18px);\r\n    }\r\n\r\n    .ly-sensor-guide h2 {\r\n      font-size: 22px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 320px) {\r\n    .ly-sensor-guide {\r\n      font-size: 15px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-wrap {\r\n      width: calc(100% - 16px);\r\n    }\r\n\r\n    .ly-sensor-guide h2 {\r\n      font-size: 21px;\r\n    }\r\n\r\n    .ly-sensor-guide h3 {\r\n      font-size: 19px;\r\n    }\r\n\r\n    .ly-sensor-guide .ly-quick-main,\r\n    .ly-sensor-guide .ly-quick-side,\r\n    .ly-sensor-guide .ly-product-box,\r\n    .ly-sensor-guide .ly-scope-box,\r\n    .ly-sensor-guide .ly-order-list,\r\n    .ly-sensor-guide .ly-files-box {\r\n      padding: 17px;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<div class=\"ly-sensor-guide\" id=\"sensor-line-surge-protection\">\r\n  <article>\r\n    <!-- QUICK ANSWER -->\r\n    <section class=\"ly-quick\" aria-labelledby=\"sensor-quick-answer\">\r\n      <div class=\"ly-wrap\">\r\n        <div class=\"ly-quick-layout\">\r\n          <div class=\"ly-quick-main\">\r\n            <span class=\"ly-kicker\">Quick Answer<\/span>\r\n\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\/fr\/sensor-line-surge-protection\/#does-a-sensor-line-need-surge-protection\" >Does a sensor line need surge protection?<\/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\/fr\/sensor-line-surge-protection\/#leeyee-option-for-rs485-and-industrial-data-lines\" >LEEYEE option for RS485 and industrial data lines<\/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\/fr\/sensor-line-surge-protection\/#a-24v-line-4%e2%80%9320ma-loop-and-rs485-line-need-different-checks\" >A 24V line, 4\u201320mA loop and RS485 line need different checks<\/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\/fr\/sensor-line-surge-protection\/#install-the-spd-where-the-exposed-cable-enters-the-protected-zone\" >Install the SPD where the exposed cable enters the protected zone<\/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\/fr\/sensor-line-surge-protection\/#four-spd-parameters-that-can-affect-normal-operation\" >Four SPD parameters that can affect normal operation<\/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\/fr\/sensor-line-surge-protection\/#information-required-before-model-sample-or-quotation-confirmation\" >Information required before model, sample or quotation confirmation<\/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\/fr\/sensor-line-surge-protection\/#who-normally-specifies-or-purchases-sensor-line-spds\" >Who normally specifies or purchases sensor-line SPDs?<\/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\/fr\/sensor-line-surge-protection\/#send-the-loop-diagram%e2%80%94not-only-%e2%80%9c24v-signal-spd%e2%80%9d\" >Send the loop diagram\u2014not only \u201c24V signal SPD\u201d<\/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\/fr\/sensor-line-surge-protection\/#sensor-line-surge-protection-questions\" >Sensor line surge protection questions<\/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\/fr\/sensor-line-surge-protection\/#authoritative-sources-used-in-this-guide\" >Authoritative sources used in this guide<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"sensor-quick-answer\"><span class=\"ez-toc-section\" id=\"does-a-sensor-line-need-surge-protection\"><\/span>\r\n              Does a sensor line need surge protection?\r\n            <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p class=\"ly-lead\">\r\n              A sensor line needs a surge-risk check when it runs outdoors,\r\n              between buildings or over a long distance.\r\n            <\/p>\r\n\r\n            <p>\r\n              These cable routes can carry induced surge voltage into a PLC,\r\n              RTU or control cabinet. This can happen even when the main power\r\n              supply already has an SPD.\r\n              <span class=\"ly-source-mark\">[1][2][3]<\/span>\r\n            <\/p>\r\n\r\n            <div\r\n              class=\"ly-answer-grid\"\r\n              aria-label=\"Three fast answers for sensor line surge protection\"\r\n            >\r\n              <div class=\"ly-answer-card\">\r\n                <span>Do I need one?<\/span>\r\n                <strong>\r\n                  Evaluate protection for outdoor, long or inter-building\r\n                  lines.\r\n                <\/strong>\r\n              <\/div>\r\n\r\n              <div class=\"ly-answer-card\">\r\n                <span>Where is it installed?<\/span>\r\n                <strong>\r\n                  Start at the control-cabinet cable entry. Add field-side\r\n                  protection when the remote end is exposed.\r\n                <\/strong>\r\n              <\/div>\r\n\r\n              <div class=\"ly-answer-card\">\r\n                <span>Which type do I select?<\/span>\r\n                <strong>\r\n                  Match the SPD to the signal. Voltage alone is not enough.\r\n                <\/strong>\r\n              <\/div>\r\n            <\/div>\r\n\r\n            <div class=\"ly-standard-row\">\r\n              <span>IEC 61643-21:2025<\/span>\r\n              <span>IEC 61643-22:2015<\/span>\r\n              <span>IEC 62305-4:2024<\/span>\r\n            <\/div>\r\n          <\/div>\r\n\r\n          <aside\r\n            class=\"ly-quick-side\"\r\n            aria-label=\"Information required for signal SPD selection\"\r\n          >\r\n            <h3>Before asking for a model<\/h3>\r\n\r\n            <ul class=\"ly-check-list\">\r\n              <li>Confirm the signal type.<\/li>\r\n              <li>Confirm the normal voltage.<\/li>\r\n              <li>Confirm the number of wires.<\/li>\r\n              <li>Confirm the maximum current.<\/li>\r\n              <li>Provide the cable route and length.<\/li>\r\n              <li>Provide the grounding arrangement.<\/li>\r\n            <\/ul>\r\n          <\/aside>\r\n        <\/div>\r\n\r\n        <nav class=\"ly-toc\" aria-label=\"Page contents\">\r\n          <strong>On this page<\/strong>\r\n\r\n          <div class=\"ly-toc-grid\">\r\n            <a href=\"#available-option\">Available LEEYEE option<\/a>\r\n            <a href=\"#choose-by-signal\">Choose by signal type<\/a>\r\n            <a href=\"#installation-position\">Installation position<\/a>\r\n            <a href=\"#signal-performance\">Signal performance<\/a>\r\n            <a href=\"#oem-checklist\">OEM ordering checklist<\/a>\r\n            <a href=\"#target-buyers\">Typical B2B buyers<\/a>\r\n            <a href=\"#sensor-faq\">FAQ<\/a>\r\n            <a href=\"#technical-references\">Technical references<\/a>\r\n          <\/div>\r\n        <\/nav>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- PRODUCT EVIDENCE -->\r\n    <section\r\n      class=\"ly-section\"\r\n      id=\"available-option\"\r\n      aria-labelledby=\"available-option-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">Published Product Option<\/span>\r\n\r\n        <h2 id=\"available-option-title\"><span class=\"ez-toc-section\" id=\"leeyee-option-for-rs485-and-industrial-data-lines\"><\/span>\r\n          LEEYEE option for RS485 and industrial data lines\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-lead\">\r\n          The LY10 is the currently published LEEYEE option for RS485 and\r\n          industrial data or control signal applications.\r\n        <\/p>\r\n\r\n        <div class=\"ly-product-layout\">\r\n          <div class=\"ly-product-box\">\r\n            <div class=\"ly-product-top\">\r\n              <div>\r\n                <h3>LY10 DIN-rail data signal surge protector<\/h3>\r\n\r\n                <p>\r\n                  It is intended for RS485, telemetry, PLC communication,\r\n                  remote control and related industrial data lines.\r\n                  <span class=\"ly-source-mark\">[4]<\/span>\r\n                <\/p>\r\n              <\/div>\r\n\r\n              <span class=\"ly-status\">Published option<\/span>\r\n            <\/div>\r\n\r\n            <div class=\"ly-spec-grid\">\r\n              <div class=\"ly-spec\">\r\n                <span>Rated voltage<\/span>\r\n                <strong>12 \/ 24 \/ 48 V DC<\/strong>\r\n              <\/div>\r\n\r\n              <div class=\"ly-spec\">\r\n                <span>Maximum continuous voltage<\/span>\r\n                <strong>15 \/ 30 \/ 60 V DC<\/strong>\r\n              <\/div>\r\n\r\n              <div class=\"ly-spec\">\r\n                <span>Rated load current<\/span>\r\n                <strong>500 mA<\/strong>\r\n              <\/div>\r\n\r\n              <div class=\"ly-spec\">\r\n                <span>Transmission rate<\/span>\r\n                <strong>Up to 10 Mbps<\/strong>\r\n              <\/div>\r\n\r\n              <div class=\"ly-spec\">\r\n                <span>Insertion loss<\/span>\r\n                <strong>\u2264 0.2 dB<\/strong>\r\n              <\/div>\r\n\r\n              <div class=\"ly-spec\">\r\n                <span>Installation<\/span>\r\n                <strong>35 mm DIN rail<\/strong>\r\n              <\/div>\r\n            <\/div>\r\n\r\n            <p class=\"ly-note\">\r\n              Confirm the voltage version, conductor assignment, data rate and\r\n              grounding method before ordering.\r\n            <\/p>\r\n\r\n            <div class=\"ly-actions\">\r\n              <a\r\n                class=\"ly-link-btn ly-link-primary\"\r\n                href=\"https:\/\/www.cnspd.com\/portfolio\/ly10-data-signal-dc-surge-protective-device\/\"\r\n                target=\"_blank\"\r\n                rel=\"noopener\"\r\n              >\r\n                <span>View LY10 Technical Data<\/span>\r\n              <\/a>\r\n\r\n              <a\r\n                class=\"ly-link-btn ly-link-outline\"\r\n                href=\"https:\/\/www.cnspd.com\/rs485-spd-guide\/\"\r\n                target=\"_blank\"\r\n                rel=\"noopener\"\r\n              >\r\n                <span>See RS485 Wiring Guide<\/span>\r\n              <\/a>\r\n            <\/div>\r\n          <\/div>\r\n\r\n          <aside class=\"ly-scope-box\">\r\n            <h3>Do not assume one model fits every signal<\/h3>\r\n\r\n            <p>\r\n              An RS485 protector should not automatically be used for every\r\n              4\u201320mA, 0\u201310V, HART, RTD or digital-output circuit.\r\n            <\/p>\r\n\r\n            <p>\r\n              These circuits may have different limits for resistance,\r\n              leakage, capacitance, current and protection topology.\r\n              <span class=\"ly-source-mark\">[5][6]<\/span>\r\n            <\/p>\r\n\r\n            <p>\r\n              For these applications, send the loop diagram and equipment\r\n              datasheet for engineering confirmation.\r\n            <\/p>\r\n          <\/aside>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- SIGNAL COMPARISON -->\r\n    <section\r\n      class=\"ly-section ly-section-soft\"\r\n      id=\"choose-by-signal\"\r\n      aria-labelledby=\"choose-signal-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">Choose by Signal Type<\/span>\r\n\r\n        <h2 id=\"choose-signal-title\"><span class=\"ez-toc-section\" id=\"a-24v-line-4%e2%80%9320ma-loop-and-rs485-line-need-different-checks\"><\/span>\r\n          A 24V line, 4\u201320mA loop and RS485 line need different checks\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-lead\">\r\n          Voltage is only the first parameter. The SPD must also allow the\r\n          normal signal to pass without causing an error.\r\n        <\/p>\r\n\r\n        <figure class=\"ly-media\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/sensor-signal-spd-selection-comparison.webp\"\r\n            alt=\"Comparison of SPD selection for 24V, 4\u201320mA, 0\u201310V, RS485 and digital I\/O sensor lines\"\r\n            width=\"1440\"\r\n            height=\"1080\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          \/>\r\n\r\n          <figcaption>\r\n            Different industrial signals have different current, resistance,\r\n            leakage and communication requirements.\r\n          <\/figcaption>\r\n        <\/figure>\r\n\r\n        <div\r\n          class=\"ly-table-wrap\"\r\n          role=\"region\"\r\n          aria-label=\"Sensor line SPD selection comparison\"\r\n          tabindex=\"0\"\r\n        >\r\n          <table>\r\n            <thead>\r\n              <tr>\r\n                <th>Signal<\/th>\r\n                <th>Typical use<\/th>\r\n                <th>Confirm first<\/th>\r\n                <th>Main risk<\/th>\r\n                <th>Next action<\/th>\r\n              <\/tr>\r\n            <\/thead>\r\n\r\n            <tbody>\r\n              <tr>\r\n                <td><strong>24V DC sensor power<\/strong><\/td>\r\n                <td>\r\n                  Power supply for proximity sensors, transmitters or remote\r\n                  instruments\r\n                <\/td>\r\n                <td>\r\n                  <span class=\"ly-mini-tag\">Uc \/ MCOV<\/span>\r\n                  <span class=\"ly-mini-tag\">Current<\/span>\r\n                  <span class=\"ly-mini-tag\">Polarity<\/span>\r\n                <\/td>\r\n                <td>\r\n                  The SPD may create too much voltage drop or may not carry the\r\n                  required current.\r\n                <\/td>\r\n                <td>\r\n                  Confirm whether the cable carries power only or combines\r\n                  power and signal conductors.\r\n                  <span class=\"ly-source-mark\">[1][5]<\/span>\r\n                <\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td><strong>4\u201320mA or HART<\/strong><\/td>\r\n                <td>\r\n                  Pressure, flow, level and process transmitters\r\n                <\/td>\r\n                <td>\r\n                  <span class=\"ly-mini-tag\">Loop voltage<\/span>\r\n                  <span class=\"ly-mini-tag\">Resistance<\/span>\r\n                  <span class=\"ly-mini-tag\">HART<\/span>\r\n                <\/td>\r\n                <td>\r\n                  Extra resistance can use part of the voltage needed by the\r\n                  transmitter.\r\n                <\/td>\r\n                <td>\r\n                  Send the loop supply, transmitter datasheet and analog-input\r\n                  data.\r\n                  <span class=\"ly-source-mark\">[5][6]<\/span>\r\n                <\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td><strong>0\u201310V AI or AO<\/strong><\/td>\r\n                <td>\r\n                  Analog sensors, actuators and PLC analog I\/O\r\n                <\/td>\r\n                <td>\r\n                  <span class=\"ly-mini-tag\">Leakage<\/span>\r\n                  <span class=\"ly-mini-tag\">Capacitance<\/span>\r\n                  <span class=\"ly-mini-tag\">Reference<\/span>\r\n                <\/td>\r\n                <td>\r\n                  Leakage or electrical loading can shift the measured value.\r\n                <\/td>\r\n                <td>\r\n                  Provide the signal range, source impedance and acceptable\r\n                  measurement error.\r\n                  <span class=\"ly-source-mark\">[5][6]<\/span>\r\n                <\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td><strong>RS485 or Modbus<\/strong><\/td>\r\n                <td>\r\n                  PLC networks, BMS, telemetry and remote I\/O\r\n                <\/td>\r\n                <td>\r\n                  <span class=\"ly-mini-tag\">Baud rate<\/span>\r\n                  <span class=\"ly-mini-tag\">Capacitance<\/span>\r\n                  <span class=\"ly-mini-tag\">Wire count<\/span>\r\n                <\/td>\r\n                <td>\r\n                  Too much capacitance can distort the data signal and cause\r\n                  communication errors.\r\n                <\/td>\r\n                <td>\r\n                  Use the RS485 guide for detailed A\/B wiring, shield and\r\n                  termination checks.\r\n                  <span class=\"ly-source-mark\">[1][4][6]<\/span>\r\n                <\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td><strong>DI or DO<\/strong><\/td>\r\n                <td>\r\n                  Proximity switches, dry contacts, alarms and transistor\r\n                  outputs\r\n                <\/td>\r\n                <td>\r\n                  <span class=\"ly-mini-tag\">PNP \/ NPN<\/span>\r\n                  <span class=\"ly-mini-tag\">Load current<\/span>\r\n                  <span class=\"ly-mini-tag\">Common wire<\/span>\r\n                <\/td>\r\n                <td>\r\n                  The wrong circuit may connect shared references or overload\r\n                  the protector.\r\n                <\/td>\r\n                <td>\r\n                  Confirm the input\/output type, voltage, current and shared\r\n                  common conductor.\r\n                  <span class=\"ly-source-mark\">[5]<\/span>\r\n                <\/td>\r\n              <\/tr>\r\n            <\/tbody>\r\n          <\/table>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- INSTALLATION -->\r\n    <section\r\n      class=\"ly-section\"\r\n      id=\"installation-position\"\r\n      aria-labelledby=\"installation-position-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">Installation Position<\/span>\r\n\r\n        <h2 id=\"installation-position-title\"><span class=\"ez-toc-section\" id=\"install-the-spd-where-the-exposed-cable-enters-the-protected-zone\"><\/span>\r\n          Install the SPD where the exposed cable enters the protected zone\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-lead\">\r\n          Protect the cabinet end first. Add field-side protection when the\r\n          remote device or cable route is also exposed.\r\n          <span class=\"ly-source-mark\">[2][3][7]<\/span>\r\n        <\/p>\r\n\r\n        <figure class=\"ly-media\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/sensor-line-surge-protection-architecture.webp\"\r\n            alt=\"Sensor line surge protection architecture with field-side and control-cabinet SPDs\"\r\n            width=\"1440\"\r\n            height=\"1080\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          \/>\r\n\r\n          <figcaption>\r\n            Typical protection arrangement for a long outdoor sensor line\r\n            between a field device and a control cabinet.\r\n          <\/figcaption>\r\n        <\/figure>\r\n\r\n        <div class=\"ly-three-grid\">\r\n          <article class=\"ly-position-card\">\r\n            <div class=\"ly-position-number\">01<\/div>\r\n\r\n            <h3>Cabinet-entry protection<\/h3>\r\n\r\n            <p>\r\n              Install the SPD near the cable-entry or marshalling area. Do not\r\n              carry a long unprotected field cable beside the PLC.\r\n              <span class=\"ly-source-mark\">[2][7]<\/span>\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-position-card\">\r\n            <div class=\"ly-position-number\">02<\/div>\r\n\r\n            <h3>Field-side protection<\/h3>\r\n\r\n            <p>\r\n              Add protection near an outdoor transmitter, mast, tank, pump or\r\n              remote junction box when the field device is exposed.\r\n              <span class=\"ly-source-mark\">[2][3]<\/span>\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-position-card\">\r\n            <div class=\"ly-position-number\">03<\/div>\r\n\r\n            <h3>Protection at both ends<\/h3>\r\n\r\n            <p>\r\n              Evaluate both ends when the cable crosses buildings, outdoor\r\n              areas, lightning protection zones or separate bonding zones.\r\n              <span class=\"ly-source-mark\">[2][3][7]<\/span>\r\n            <\/p>\r\n          <\/article>\r\n        <\/div>\r\n\r\n        <div class=\"ly-decision-note\">\r\n          <div class=\"ly-decision-icon\">PE<\/div>\r\n\r\n          <p>\r\n            <strong>Keep the SPD bonding connection short.<\/strong>\r\n            A long conductor adds inductive voltage during a surge. This can\r\n            increase the voltage seen by the protected equipment.\r\n            <span class=\"ly-source-mark\">[6][7]<\/span>\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- PLAIN LANGUAGE EXPLANATIONS -->\r\n    <section\r\n      class=\"ly-section ly-section-soft\"\r\n      id=\"signal-performance\"\r\n      aria-labelledby=\"signal-performance-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">Signal Performance<\/span>\r\n\r\n        <h2 id=\"signal-performance-title\"><span class=\"ez-toc-section\" id=\"four-spd-parameters-that-can-affect-normal-operation\"><\/span>\r\n          Four SPD parameters that can affect normal operation\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-lead\">\r\n          These parameters explain why a protector cannot be selected by\r\n          voltage alone.\r\n        <\/p>\r\n\r\n        <div class=\"ly-four-grid\">\r\n          <article class=\"ly-term-card\">\r\n            <h3>1. Series resistance<\/h3>\r\n\r\n            <p>\r\n              This is the extra resistance added by the SPD to the circuit.\r\n            <\/p>\r\n\r\n            <div class=\"ly-example\">\r\n              <strong>Example:<\/strong> In a 4\u201320mA loop, the cable and SPD use\r\n              part of the available loop voltage. If too little voltage remains,\r\n              the transmitter may stop working correctly.\r\n              <span class=\"ly-source-mark\">[5][6]<\/span>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"ly-term-card\">\r\n            <h3>2. Leakage current<\/h3>\r\n\r\n            <p>\r\n              This is a small current that may flow through the SPD during\r\n              normal operation.\r\n            <\/p>\r\n\r\n            <div class=\"ly-example\">\r\n              <strong>Example:<\/strong> In a high-impedance 0\u201310V signal, too\r\n              much leakage can slightly change the measured voltage.\r\n              <span class=\"ly-source-mark\">[5][6]<\/span>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"ly-term-card\">\r\n            <h3>3. Capacitance and bandwidth<\/h3>\r\n\r\n            <p>\r\n              These parameters show how easily a changing data signal can pass\r\n              through the protector.\r\n            <\/p>\r\n\r\n            <div class=\"ly-example\">\r\n              <strong>Example:<\/strong> Excessive capacitance can slow the edges\r\n              of an RS485 waveform. The result may be unstable communication.\r\n              <span class=\"ly-source-mark\">[1][4][6]<\/span>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"ly-term-card\">\r\n            <h3>4. Grounding and shield arrangement<\/h3>\r\n\r\n            <p>\r\n              The SPD needs a short discharge path to the local equipotential\r\n              system.\r\n            <\/p>\r\n\r\n            <div class=\"ly-example\">\r\n              <strong>Important:<\/strong> The SPD earth connection and the cable\r\n              shield strategy are related, but they are not the same decision.\r\n              Follow the equipment and project EMC requirements.\r\n              <span class=\"ly-source-mark\">[3][7]<\/span>\r\n            <\/div>\r\n          <\/article>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- OEM CHECKLIST -->\r\n    <section\r\n      class=\"ly-section\"\r\n      id=\"oem-checklist\"\r\n      aria-labelledby=\"oem-checklist-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">OEM and Project Confirmation<\/span>\r\n\r\n        <h2 id=\"oem-checklist-title\"><span class=\"ez-toc-section\" id=\"information-required-before-model-sample-or-quotation-confirmation\"><\/span>\r\n          Information required before model, sample or quotation confirmation\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"ly-lead\">\r\n          A request that says only \u201c24V signal SPD\u201d is not enough for reliable\r\n          selection.\r\n        <\/p>\r\n\r\n        <figure class=\"ly-media\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/sensor-line-spd-oem-ordering-checklist.webp\"\r\n            alt=\"OEM ordering checklist for sensor and instrumentation line surge protectors\"\r\n            width=\"1440\"\r\n            height=\"1080\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          \/>\r\n\r\n          <figcaption>\r\n            Send the circuit data before requesting a sample, OEM label or bulk\r\n            quotation.\r\n          <\/figcaption>\r\n        <\/figure>\r\n\r\n        <div class=\"ly-order-layout\">\r\n          <div class=\"ly-order-list\">\r\n            <div class=\"ly-order-item\">\r\n              <span>01<\/span>\r\n              <strong>Signal type<\/strong>\r\n              <p>24V, 4\u201320mA, HART, 0\u201310V, RS485, DI, DO or another signal.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>02<\/span>\r\n              <strong>Operating voltage<\/strong>\r\n              <p>Nominal voltage and the highest continuous voltage.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>03<\/span>\r\n              <strong>Wire count<\/strong>\r\n              <p>Two-, three- or four-wire circuit and conductor assignment.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>04<\/span>\r\n              <strong>Maximum current<\/strong>\r\n              <p>Loop, sensor-supply or digital-output load current.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>05<\/span>\r\n              <strong>Signal performance<\/strong>\r\n              <p>Baud rate, HART, resistance, leakage or capacitance limits.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>06<\/span>\r\n              <strong>Cable information<\/strong>\r\n              <p>Length, route, outdoor exposure and inter-building sections.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>07<\/span>\r\n              <strong>Installation position<\/strong>\r\n              <p>Cabinet entry, field device, junction box or both ends.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>08<\/span>\r\n              <strong>Grounding and shield<\/strong>\r\n              <p>Local bonding point, shield termination and reference method.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>09<\/span>\r\n              <strong>Environment<\/strong>\r\n              <p>Temperature, IP rating, outdoor and hazardous-area needs.<\/p>\r\n            <\/div>\r\n\r\n            <div class=\"ly-order-item\">\r\n              <span>10<\/span>\r\n              <strong>OEM requirements<\/strong>\r\n              <p>Logo, label, terminal marks, quantity, packaging and documents.<\/p>\r\n            <\/div>\r\n          <\/div>\r\n\r\n          <aside class=\"ly-files-box\">\r\n            <h3>Recommended files to send<\/h3>\r\n\r\n            <ul class=\"ly-check-list\">\r\n              <li>Loop or wiring diagram<\/li>\r\n              <li>Sensor or transmitter datasheet<\/li>\r\n              <li>PLC, RTU or DCS I\/O data<\/li>\r\n              <li>Cable length and routing description<\/li>\r\n              <li>Grounding and shield layout<\/li>\r\n              <li>OEM label and packaging request<\/li>\r\n            <\/ul>\r\n\r\n            <p class=\"ly-note\" style=\"margin-top: 18px;\">\r\n              This information allows the supplier to check electrical\r\n              compatibility before production.\r\n              <span class=\"ly-source-mark\">[1][2][5][6][7]<\/span>\r\n            <\/p>\r\n          <\/aside>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- B2B BUYERS -->\r\n    <section\r\n      class=\"ly-section ly-section-soft\"\r\n      id=\"target-buyers\"\r\n      aria-labelledby=\"target-buyers-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">B2B Applications<\/span>\r\n\r\n        <h2 id=\"target-buyers-title\"><span class=\"ez-toc-section\" id=\"who-normally-specifies-or-purchases-sensor-line-spds\"><\/span>\r\n          Who normally specifies or purchases sensor-line SPDs?\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <div class=\"ly-buyer-grid\">\r\n          <article class=\"ly-buyer-card\">\r\n            <h3>Control-cabinet manufacturers<\/h3>\r\n            <p>\r\n              For PLC, RTU, analog I\/O, remote I\/O and field-cable entry\r\n              protection.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-buyer-card\">\r\n            <h3>Industrial system integrators<\/h3>\r\n            <p>\r\n              For water treatment, factory automation, BMS, telemetry and\r\n              process-control projects.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-buyer-card\">\r\n            <h3>OEM and private-label buyers<\/h3>\r\n            <p>\r\n              For model matching, terminal marking, branded labels, packaging\r\n              and bulk supply.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-buyer-card\">\r\n            <h3>Water and pump projects<\/h3>\r\n            <p>\r\n              For outdoor level, pressure, flow, float-switch and remote-station\r\n              signals.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-buyer-card\">\r\n            <h3>Factory maintenance teams<\/h3>\r\n            <p>\r\n              For repeated sensor failures, unstable PLC channels and exposed\r\n              instrument lines.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"ly-buyer-card\">\r\n            <h3>Industrial distributors<\/h3>\r\n            <p>\r\n              For stocked signal-SPD ranges that must cover clearly defined\r\n              voltages and signal types.\r\n            <\/p>\r\n          <\/article>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- CTA -->\r\n    <section class=\"ly-cta\" aria-labelledby=\"sensor-cta-title\">\r\n      <div class=\"ly-wrap\">\r\n        <div class=\"ly-cta-layout\">\r\n          <div>\r\n            <h2 id=\"sensor-cta-title\"><span class=\"ez-toc-section\" id=\"send-the-loop-diagram%e2%80%94not-only-%e2%80%9c24v-signal-spd%e2%80%9d\"><\/span>\r\n              Send the loop diagram\u2014not only \u201c24V signal SPD\u201d\r\n            <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n            <p>\r\n              LEEYEE can review the signal type, voltage, wire count, current,\r\n              cable route, mounting method and OEM requirements before model\r\n              confirmation.\r\n            <\/p>\r\n          <\/div>\r\n\r\n          <div class=\"ly-cta-actions\">\r\n            <a\r\n              class=\"ly-btn ly-btn-primary leeyee-site-popup-btn\"\r\n              href=\"javascript:void(0);\"\r\n              aria-label=\"Request signal SPD matching\"\r\n            >\r\n              <span>Request Signal SPD Matching<\/span>\r\n            <\/a>\r\n\r\n            <a\r\n              class=\"ly-btn ly-btn-secondary\"\r\n              href=\"https:\/\/www.cnspd.com\/contact\/\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n              aria-label=\"Send a sensor line wiring diagram\"\r\n            >\r\n              <span>Send Wiring Diagram<\/span>\r\n            <\/a>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- FAQ -->\r\n    <section\r\n      class=\"ly-section\"\r\n      id=\"sensor-faq\"\r\n      aria-labelledby=\"sensor-faq-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">FAQ<\/span>\r\n\r\n        <h2 id=\"sensor-faq-title\"><span class=\"ez-toc-section\" id=\"sensor-line-surge-protection-questions\"><\/span>\r\n          Sensor line surge protection questions\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <div class=\"ly-faq-list\">\r\n          <details>\r\n            <summary>\r\n              Does every outdoor sensor need a surge protector?\r\n            <\/summary>\r\n\r\n            <div class=\"ly-faq-answer\">\r\n              <p>\r\n                Not automatically. Check the cable length, outdoor exposure,\r\n                lightning protection zones, equipment value and existing\r\n                protection. Outdoor exposure is a strong reason to perform a\r\n                surge-risk assessment.\r\n                <span class=\"ly-source-mark\">[2][3]<\/span>\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>\r\n              Should sensor-line SPDs be installed at both ends?\r\n            <\/summary>\r\n\r\n            <div class=\"ly-faq-answer\">\r\n              <p>\r\n                Evaluate both ends when the cable crosses buildings, outdoor\r\n                areas or separate local bonding zones. A short internal cable\r\n                inside one well-bonded structure may not need the same\r\n                arrangement.\r\n                <span class=\"ly-source-mark\">[2][3][7]<\/span>\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>\r\n              Can one SPD protect both 24V power and a 4\u201320mA signal?\r\n            <\/summary>\r\n\r\n            <div class=\"ly-faq-answer\">\r\n              <p>\r\n                Only when it is designed for that exact combined circuit. A\r\n                power pair and an analog signal pair may have different current,\r\n                resistance, leakage and protection-mode requirements.\r\n                <span class=\"ly-source-mark\">[5][6]<\/span>\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>\r\n              Can a signal SPD affect measurement or communication?\r\n            <\/summary>\r\n\r\n            <div class=\"ly-faq-answer\">\r\n              <p>\r\n                Yes, if it is selected incorrectly. Series resistance can affect\r\n                a current loop. Leakage can affect an analog voltage. Excessive\r\n                capacitance can affect a data signal.\r\n                <span class=\"ly-source-mark\">[5][6]<\/span>\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>\r\n              What information is required for model confirmation?\r\n            <\/summary>\r\n\r\n            <div class=\"ly-faq-answer\">\r\n              <p>\r\n                Provide the signal type, voltage, wire count, current, data rate\r\n                or HART requirement, cable route, installation position,\r\n                grounding arrangement and environment.\r\n                <span class=\"ly-source-mark\">[1][2]<\/span>\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <!-- REFERENCES -->\r\n    <section\r\n      class=\"ly-references\"\r\n      id=\"technical-references\"\r\n      aria-labelledby=\"technical-references-title\"\r\n    >\r\n      <div class=\"ly-wrap\">\r\n        <span class=\"ly-kicker\">Technical References<\/span>\r\n\r\n        <h2 id=\"technical-references-title\"><span class=\"ez-toc-section\" id=\"authoritative-sources-used-in-this-guide\"><\/span>\r\n          Authoritative sources used in this guide\r\n        <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <ol class=\"ly-reference-list\">\r\n          <li>\r\n            <strong>[1]<\/strong>\r\n            <a\r\n              href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n            >\r\n              IEC 61643-21:2025\r\n            <\/a>\r\n            \u2014 Low-voltage surge protective devices connected to\r\n            telecommunications and signalling networks: performance\r\n            requirements and testing methods.\r\n          <\/li>\r\n\r\n          <li>\r\n            <strong>[2]<\/strong>\r\n            <a\r\n              href=\"https:\/\/webstore.iec.ch\/en\/publication\/22772\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n            >\r\n              IEC 61643-22:2015\r\n            <\/a>\r\n            \u2014 Selection, operation, location and coordination principles for\r\n            telecommunications and signalling network SPDs.\r\n          <\/li>\r\n\r\n          <li>\r\n            <strong>[3]<\/strong>\r\n            <a\r\n              href=\"https:\/\/webstore.iec.ch\/en\/publication\/29590\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n            >\r\n              IEC 62305-4:2024\r\n            <\/a>\r\n            \u2014 Protection of electrical and electronic systems within\r\n            structures against lightning electromagnetic effects.\r\n          <\/li>\r\n\r\n          <li>\r\n            <strong>[4]<\/strong>\r\n            <a\r\n              href=\"https:\/\/www.cnspd.com\/portfolio\/ly10-data-signal-dc-surge-protective-device\/\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n            >\r\n              LEEYEE LY10 Data Signal Surge Protective Device\r\n            <\/a>\r\n            \u2014 Published voltage, current, transmission-rate, insertion-loss and\r\n            DIN-rail installation data.\r\n          <\/li>\r\n\r\n          <li>\r\n            <strong>[5]<\/strong>\r\n            <a\r\n              href=\"https:\/\/www.phoenixcontact.com\/assets\/c8428ddc-254d-40b8-a2f2-540ac13bd818\/epaper\/5131327_TT_Basics_EN.pdf\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n            >\r\n              Phoenix Contact \u2014 Fundamentals for Surge Protection\r\n            <\/a>\r\n            \u2014 Instrumentation and control circuits, floating 4\u201320mA loops,\r\n            binary signals and resistance measurements.\r\n          <\/li>\r\n\r\n          <li>\r\n            <strong>[6]<\/strong>\r\n            <a\r\n              href=\"https:\/\/www.mtl-inst.com\/images\/uploads\/AN_904-1002_Rev_I.pdf\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n            >\r\n              Eaton MTL \u2014 Lightning and Surge Protection: Basic Principles\r\n            <\/a>\r\n            \u2014 Signal-SPD operation, series impedance, leakage, capacitance and\r\n            effects on normal signal circuits.\r\n          <\/li>\r\n\r\n          <li>\r\n            <strong>[7]<\/strong>\r\n            <a\r\n              href=\"https:\/\/www.mtl-inst.com\/images\/uploads\/AN_904-1003_Rev_G.pdf\"\r\n              target=\"_blank\"\r\n              rel=\"noopener\"\r\n            >\r\n              Eaton MTL \u2014 Earthing Guide for Surge Protection\r\n            <\/a>\r\n            \u2014 Equipotential bonding, cable screens, local earth connections and\r\n            field-to-control-room installations.\r\n          <\/li>\r\n        <\/ol>\r\n\r\n        <p class=\"ly-note\">\r\n          Final selection must be checked against the sensor, transmitter, PLC\r\n          or controller datasheet, the project lightning-risk assessment and\r\n          the selected SPD technical data.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n  <\/article>\r\n<\/div>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"Article\",\r\n  \"mainEntityOfPage\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/www.cnspd.com\/sensor-line-surge-protection\/\"\r\n  },\r\n  \"headline\": \"Sensor Line Surge Protection for 24V, 4\u201320mA, RS485 & PLC I\/O\",\r\n  \"description\": \"Learn how B2B buyers and engineers select surge protection for 24V sensors, 4\u201320mA loops, RS485 and PLC I\/O, including installation and OEM confirmation.\",\r\n  \"image\": [\r\n    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Check the cable length, outdoor exposure, lightning protection zones, equipment value and existing protection. Outdoor exposure is a strong reason to perform a surge-risk assessment.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Should sensor-line SPDs be installed at both ends?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Evaluate both ends when the cable crosses buildings, outdoor areas or separate local bonding zones. A short internal cable inside one well-bonded structure may not need the same arrangement.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can one SPD protect both 24V power and a 4\u201320mA signal?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Only when it is designed for that exact combined circuit. A power pair and an analog signal pair may have different current, resistance, leakage and protection-mode requirements.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can a signal SPD affect measurement or communication?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Yes, if it is selected incorrectly. 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A sensor line needs a surge-risk check when it runs outdoors, between buildings or over a long distance. These cable routes can carry induced surge voltage into a PLC, RTU or control cabinet. This can happen even when the main power supply already has an SPD&#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-30155","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>Sensor Line Surge Protection: 24V, 4\u201320mA &amp; RS485<\/title>\n<meta name=\"description\" content=\"Learn how to select and install surge protection for 24V sensors, 4\u201320mA loops, RS485 and PLC I\/O, including grounding and OEM order checks.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/fr\/sensor-line-surge-protection\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sensor Line Surge Protection: 24V, 4\u201320mA &amp; 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