{"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":"Protection contre les surtensions de ligne de capteurs pour 24V, 4\u201320mA, RS485 et E\/S PLC"},"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_87 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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Il est n\u00e9cessaire de v\u00e9rifier si un c\u00e2ble de capteur pr\u00e9sente un risque de surtension lorsqu'il passe \u00e0 l'ext\u00e9rieur, entre des b\u00e2timents ou sur une longue distance. Ces trac\u00e9s de c\u00e2bles peuvent transmettre une tension de surtension induite vers un automate programmable (PLC), une unit\u00e9 de t\u00e9l\u00e9commande (RTU) ou une armoire de commande. Cela peut se produire m\u00eame lorsque l'alimentation \u00e9lectrique principale est d\u00e9j\u00e0 \u00e9quip\u00e9e d'un dispositif de protection contre les surtensions (SPD)\u2026<\/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 v28.3 - 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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