{"id":30370,"date":"2026-07-23T12:57:29","date_gmt":"2026-07-23T04:57:29","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30370"},"modified":"2026-07-23T16:08:23","modified_gmt":"2026-07-23T08:08:23","slug":"spd-sccr-rating-guide-for-panel-builders-and-oem-buyers","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/","title":{"rendered":"Gu\u00eda de calificaci\u00f3n SPD SCCR para constructores de paneles y compradores de OEM"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30370\" class=\"elementor elementor-30370\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f21f219 e-flex e-con-boxed e-con e-parent\" data-id=\"f21f219\" 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-287f42b elementor-widget elementor-widget-html\" data-id=\"287f42b\" 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 id=\"leeyee-spd-sccr-article-styles\">\r\n  :root {\r\n    --sccr-blue: #004898;\r\n    --sccr-blue-dark: #00356f;\r\n    --sccr-blue-soft: #eef6fd;\r\n    --sccr-blue-pale: #f7fbff;\r\n    --sccr-text: #1d2736;\r\n    --sccr-muted: #5d6878;\r\n    --sccr-border: #d9e2ec;\r\n    --sccr-border-dark: #bdcad7;\r\n    --sccr-white: #ffffff;\r\n    --sccr-orange: #b85a12;\r\n    --sccr-orange-soft: #fff6ed;\r\n    --sccr-green: #176b47;\r\n    --sccr-green-soft: #edf8f2;\r\n    --sccr-red: #a7352b;\r\n    --sccr-red-soft: #fff2f0;\r\n    --sccr-shadow: 0 8px 24px rgba(26, 53, 82, 0.07);\r\n    --sccr-radius: 14px;\r\n    --sccr-content: 960px;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article,\r\n  #leeyee-spd-sccr-article *,\r\n  #leeyee-spd-sccr-article *::before,\r\n  #leeyee-spd-sccr-article *::after {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article {\r\n    width: 100%;\r\n    margin: 0;\r\n    padding: 0;\r\n    color: var(--sccr-text);\r\n    background: var(--sccr-white);\r\n    font-family: Arial, Helvetica, sans-serif;\r\n    font-size: 17px;\r\n    line-height: 1.72;\r\n    -webkit-font-smoothing: antialiased;\r\n    text-rendering: optimizeLegibility;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article img {\r\n    display: block;\r\n    max-width: 100%;\r\n    height: auto;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article a {\r\n    color: var(--sccr-blue);\r\n    text-decoration-thickness: 1px;\r\n    text-underline-offset: 3px;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article a:hover {\r\n    color: var(--sccr-blue-dark);\r\n  }\r\n\r\n  #leeyee-spd-sccr-article h2,\r\n  #leeyee-spd-sccr-article h3,\r\n  #leeyee-spd-sccr-article h4 {\r\n    margin-top: 0;\r\n    color: #142b45;\r\n    font-weight: 800;\r\n    line-height: 1.25;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article h2 {\r\n    margin-bottom: 18px;\r\n    font-size: 32px;\r\n    letter-spacing: -0.025em;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article h3 {\r\n    margin-bottom: 11px;\r\n    font-size: 23px;\r\n    letter-spacing: -0.012em;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article h4 {\r\n    margin-bottom: 8px;\r\n    font-size: 18px;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article p {\r\n    margin-top: 0;\r\n    margin-bottom: 17px;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .sccr-article-shell {\r\n    width: min(calc(100% - 40px), var(--sccr-content));\r\n    margin-right: auto;\r\n    margin-left: auto;\r\n  }\r\n\r\n  .sccr-article-header {\r\n    padding: 42px 0 24px;\r\n    border-bottom: 1px solid var(--sccr-border);\r\n  }\r\n\r\n  .sccr-article-category {\r\n    margin-bottom: 11px;\r\n    color: var(--sccr-blue);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n    line-height: 1.35;\r\n    letter-spacing: 0.08em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .sccr-article-lead {\r\n    max-width: 850px;\r\n    margin-bottom: 19px;\r\n    color: #354356;\r\n    font-size: 20px;\r\n    line-height: 1.65;\r\n  }\r\n\r\n  .sccr-article-meta {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 8px 22px;\r\n    color: var(--sccr-muted);\r\n    font-size: 13px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .sccr-article-meta strong {\r\n    color: #324156;\r\n  }\r\n\r\n  .sccr-section {\r\n    padding: 58px 0;\r\n  }\r\n\r\n  .sccr-section + .sccr-section {\r\n    border-top: 1px solid #edf1f5;\r\n  }\r\n\r\n  .sccr-section--soft {\r\n    background: var(--sccr-blue-pale);\r\n  }\r\n\r\n  .sccr-section-intro {\r\n    max-width: 820px;\r\n    color: var(--sccr-muted);\r\n    font-size: 18px;\r\n  }\r\n\r\n  .sccr-anchor {\r\n    scroll-margin-top: 28px;\r\n  }\r\n\r\n  .sccr-source {\r\n    font-size: 0.75em;\r\n    font-weight: 800;\r\n    text-decoration: none;\r\n    vertical-align: super;\r\n  }\r\n\r\n  .sccr-quick-answer {\r\n    margin-top: 26px;\r\n    padding: 27px 29px;\r\n    border: 1px solid #bdd5ec;\r\n    border-left: 5px solid var(--sccr-blue);\r\n    border-radius: var(--sccr-radius);\r\n    background: var(--sccr-blue-pale);\r\n  }\r\n\r\n  .sccr-quick-answer h2 {\r\n    margin-bottom: 13px !important;\r\n    font-size: 27px !important;\r\n  }\r\n\r\n  .sccr-quick-answer p {\r\n    font-size: 18px;\r\n  }\r\n\r\n  .sccr-formula {\r\n    display: grid;\r\n    grid-template-columns: minmax(0, 1fr) 54px minmax(0, 1fr);\r\n    gap: 13px;\r\n    align-items: stretch;\r\n    margin-top: 23px;\r\n  }\r\n\r\n  .sccr-formula-box {\r\n    display: flex;\r\n    min-height: 96px;\r\n    padding: 17px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 10px;\r\n    flex-direction: column;\r\n    align-items: center;\r\n    justify-content: center;\r\n    background: var(--sccr-white);\r\n    text-align: center;\r\n  }\r\n\r\n  .sccr-formula-box span {\r\n    display: block;\r\n    margin-bottom: 4px;\r\n    color: var(--sccr-muted);\r\n    font-size: 11px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.05em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .sccr-formula-box strong {\r\n    color: #173555;\r\n    font-size: 17px;\r\n    line-height: 1.4;\r\n  }\r\n\r\n  .sccr-formula-symbol {\r\n    display: flex;\r\n    min-height: 96px;\r\n    border-radius: 10px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    color: var(--sccr-white);\r\n    background: var(--sccr-blue);\r\n    font-size: 29px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .sccr-toc {\r\n    margin-top: 24px;\r\n    padding: 24px 26px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: var(--sccr-radius);\r\n    background: var(--sccr-white);\r\n    box-shadow: var(--sccr-shadow);\r\n  }\r\n\r\n  .sccr-toc h2 {\r\n    margin-bottom: 14px !important;\r\n    font-size: 22px !important;\r\n  }\r\n\r\n  .sccr-toc ol {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 7px 28px;\r\n    margin: 0;\r\n    padding-left: 23px;\r\n  }\r\n\r\n  .sccr-toc li {\r\n    padding-left: 3px;\r\n    color: var(--sccr-muted);\r\n    font-size: 14px;\r\n  }\r\n\r\n  .sccr-toc a {\r\n    font-weight: 700;\r\n    text-decoration: none;\r\n  }\r\n\r\n  .sccr-key-points {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 17px;\r\n    margin-top: 28px;\r\n  }\r\n\r\n  .sccr-key-point {\r\n    padding: 21px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 12px;\r\n    background: var(--sccr-white);\r\n  }\r\n\r\n  .sccr-key-point::before {\r\n    display: block;\r\n    width: 38px;\r\n    height: 4px;\r\n    margin-bottom: 16px;\r\n    border-radius: 99px;\r\n    background: var(--sccr-blue);\r\n    content: \"\";\r\n  }\r\n\r\n  .sccr-key-point:nth-child(2)::before {\r\n    background: var(--sccr-orange);\r\n  }\r\n\r\n  .sccr-key-point:nth-child(3)::before {\r\n    background: var(--sccr-green);\r\n  }\r\n\r\n  .sccr-key-point h3 {\r\n    font-size: 19px !important;\r\n  }\r\n\r\n  .sccr-key-point p {\r\n    color: var(--sccr-muted);\r\n    font-size: 14px;\r\n    line-height: 1.62;\r\n  }\r\n\r\n  .sccr-figure {\r\n    margin: 32px 0 0;\r\n    padding: 11px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: var(--sccr-radius);\r\n    background: var(--sccr-white);\r\n    box-shadow: var(--sccr-shadow);\r\n  }\r\n\r\n  .sccr-figure img {\r\n    width: 100%;\r\n    border-radius: 9px;\r\n    background: var(--sccr-white);\r\n  }\r\n\r\n  .sccr-figure figcaption {\r\n    padding: 12px 8px 3px;\r\n    color: var(--sccr-muted);\r\n    font-size: 13px;\r\n    line-height: 1.55;\r\n    text-align: center;\r\n  }\r\n\r\n  .sccr-full-image-link {\r\n    display: inline-block;\r\n    margin-top: 4px;\r\n    font-size: 12px;\r\n    font-weight: 700;\r\n  }\r\n\r\n  .sccr-table-wrap {\r\n    margin-top: 25px;\r\n    border: 1px solid var(--sccr-border-dark);\r\n    border-radius: var(--sccr-radius);\r\n    overflow: hidden;\r\n    background: var(--sccr-white);\r\n    box-shadow: var(--sccr-shadow);\r\n  }\r\n\r\n  .sccr-table {\r\n    width: 100%;\r\n    margin: 0;\r\n    border-collapse: collapse;\r\n    table-layout: fixed;\r\n    font-size: 14px;\r\n    line-height: 1.5;\r\n  }\r\n\r\n  .sccr-table th,\r\n  .sccr-table td {\r\n    padding: 15px 14px;\r\n    border-right: 1px solid var(--sccr-border);\r\n    border-bottom: 1px solid var(--sccr-border);\r\n    text-align: left;\r\n    vertical-align: top;\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .sccr-table th:last-child,\r\n  .sccr-table td:last-child {\r\n    border-right: 0;\r\n  }\r\n\r\n  .sccr-table tr:last-child td {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .sccr-table thead th {\r\n    color: var(--sccr-white);\r\n    background: var(--sccr-blue);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .sccr-table tbody tr:nth-child(even) td {\r\n    background: #f8fafc;\r\n  }\r\n\r\n  .sccr-table td:first-child {\r\n    color: #153859;\r\n    font-weight: 800;\r\n  }\r\n\r\n  .sccr-alert {\r\n    display: grid;\r\n    grid-template-columns: 41px minmax(0, 1fr);\r\n    gap: 15px;\r\n    margin-top: 23px;\r\n    padding: 20px 22px;\r\n    border-radius: 12px;\r\n  }\r\n\r\n  .sccr-alert--info {\r\n    border: 1px solid #bdd6ec;\r\n    background: var(--sccr-blue-soft);\r\n  }\r\n\r\n  .sccr-alert--warning {\r\n    border: 1px solid #ebc29f;\r\n    background: var(--sccr-orange-soft);\r\n  }\r\n\r\n  .sccr-alert--danger {\r\n    border: 1px solid #ebbbb6;\r\n    background: var(--sccr-red-soft);\r\n  }\r\n\r\n  .sccr-alert-icon {\r\n    display: flex;\r\n    width: 38px;\r\n    height: 38px;\r\n    border-radius: 10px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    color: var(--sccr-white);\r\n    background: var(--sccr-blue);\r\n    font-size: 18px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .sccr-alert--warning .sccr-alert-icon {\r\n    background: var(--sccr-orange);\r\n  }\r\n\r\n  .sccr-alert--danger .sccr-alert-icon {\r\n    background: var(--sccr-red);\r\n  }\r\n\r\n  .sccr-alert h3 {\r\n    margin-bottom: 6px !important;\r\n    font-size: 19px !important;\r\n  }\r\n\r\n  .sccr-two-columns {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 20px;\r\n    margin-top: 26px;\r\n  }\r\n\r\n  .sccr-plain-box {\r\n    padding: 23px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 12px;\r\n    background: var(--sccr-white);\r\n  }\r\n\r\n  .sccr-plain-box h3 {\r\n    font-size: 20px !important;\r\n  }\r\n\r\n  .sccr-plain-box p,\r\n  .sccr-plain-box li {\r\n    font-size: 15px;\r\n  }\r\n\r\n  .sccr-plain-box ul {\r\n    margin: 14px 0 0;\r\n    padding-left: 21px;\r\n  }\r\n\r\n  .sccr-plain-box li + li {\r\n    margin-top: 6px;\r\n  }\r\n\r\n  .sccr-equation {\r\n    margin: 17px 0;\r\n    padding: 16px 18px;\r\n    border-left: 4px solid var(--sccr-blue);\r\n    border-radius: 8px;\r\n    color: #153859;\r\n    background: var(--sccr-blue-soft);\r\n    font-family: \"Courier New\", Courier, monospace;\r\n    font-size: 17px;\r\n    font-weight: 800;\r\n    line-height: 1.5;\r\n    text-align: center;\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .sccr-project-details {\r\n    display: grid;\r\n    grid-template-columns: repeat(4, minmax(0, 1fr));\r\n    gap: 11px;\r\n    margin: 24px 0;\r\n  }\r\n\r\n  .sccr-project-detail {\r\n    padding: 15px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 10px;\r\n    background: var(--sccr-white);\r\n  }\r\n\r\n  .sccr-project-detail span {\r\n    display: block;\r\n    margin-bottom: 4px;\r\n    color: var(--sccr-muted);\r\n    font-size: 10px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.05em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .sccr-project-detail strong {\r\n    color: #153859;\r\n    font-size: 15px;\r\n    line-height: 1.4;\r\n  }\r\n\r\n  .sccr-option {\r\n    position: relative;\r\n    padding-top: 27px;\r\n  }\r\n\r\n  .sccr-option::before {\r\n    position: absolute;\r\n    top: 0;\r\n    left: 0;\r\n    width: 100%;\r\n    height: 5px;\r\n    border-radius: 12px 12px 0 0;\r\n    background: var(--sccr-red);\r\n    content: \"\";\r\n  }\r\n\r\n  .sccr-option--pass::before {\r\n    background: var(--sccr-green);\r\n  }\r\n\r\n  .sccr-status {\r\n    display: inline-flex;\r\n    margin-bottom: 13px;\r\n    padding: 6px 9px;\r\n    border-radius: 6px;\r\n    color: var(--sccr-red);\r\n    background: var(--sccr-red-soft);\r\n    font-size: 11px;\r\n    font-weight: 900;\r\n    letter-spacing: 0.04em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  .sccr-option--pass .sccr-status {\r\n    color: var(--sccr-green);\r\n    background: var(--sccr-green-soft);\r\n  }\r\n\r\n  .sccr-spec-list {\r\n    display: grid;\r\n    gap: 7px;\r\n    margin: 14px 0 18px;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .sccr-spec-list li {\r\n    display: flex;\r\n    gap: 10px;\r\n    padding-bottom: 7px;\r\n    border-bottom: 1px dashed var(--sccr-border);\r\n    justify-content: space-between;\r\n    color: var(--sccr-muted);\r\n    font-size: 14px;\r\n  }\r\n\r\n  .sccr-spec-list strong {\r\n    color: var(--sccr-text);\r\n    text-align: right;\r\n  }\r\n\r\n  .sccr-steps {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 14px;\r\n    margin-top: 26px;\r\n  }\r\n\r\n  .sccr-step {\r\n    display: grid;\r\n    grid-template-columns: 40px minmax(0, 1fr);\r\n    gap: 14px;\r\n    padding: 19px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 11px;\r\n    background: var(--sccr-white);\r\n  }\r\n\r\n  .sccr-step-number {\r\n    display: flex;\r\n    width: 38px;\r\n    height: 38px;\r\n    border-radius: 9px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    color: var(--sccr-white);\r\n    background: var(--sccr-blue);\r\n    font-size: 12px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .sccr-step h3 {\r\n    margin-bottom: 5px !important;\r\n    font-size: 18px !important;\r\n  }\r\n\r\n  .sccr-step p {\r\n    color: var(--sccr-muted);\r\n    font-size: 14px;\r\n    line-height: 1.58;\r\n  }\r\n\r\n  .sccr-evidence {\r\n    margin-top: 25px;\r\n    padding: 24px 26px;\r\n    border: 1px solid #bdd5eb;\r\n    border-radius: var(--sccr-radius);\r\n    background: var(--sccr-blue-pale);\r\n  }\r\n\r\n  .sccr-evidence h3 {\r\n    font-size: 21px !important;\r\n  }\r\n\r\n  .sccr-evidence-list {\r\n    margin: 17px 0 0;\r\n    padding-left: 21px;\r\n  }\r\n\r\n  .sccr-evidence-list li + li {\r\n    margin-top: 10px;\r\n  }\r\n\r\n  .sccr-evidence-list strong {\r\n    color: #173b5d;\r\n  }\r\n\r\n  .sccr-checklist {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    gap: 9px 22px;\r\n    margin: 20px 0 0;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .sccr-checklist li {\r\n    display: grid;\r\n    grid-template-columns: 21px minmax(0, 1fr);\r\n    gap: 9px;\r\n    align-items: start;\r\n    padding-bottom: 8px;\r\n    border-bottom: 1px solid var(--sccr-border);\r\n    font-size: 14px;\r\n  }\r\n\r\n  .sccr-checklist li::before {\r\n    display: flex;\r\n    width: 19px;\r\n    height: 19px;\r\n    margin-top: 2px;\r\n    border-radius: 50%;\r\n    align-items: center;\r\n    justify-content: center;\r\n    color: var(--sccr-white);\r\n    background: var(--sccr-blue);\r\n    font-size: 9px;\r\n    font-weight: 900;\r\n    content: \"\u2713\";\r\n  }\r\n\r\n  .sccr-light-cta {\r\n    margin-top: 30px;\r\n    padding: 25px 27px;\r\n    border: 1px solid #b9d3ea;\r\n    border-radius: var(--sccr-radius);\r\n    background: var(--sccr-blue-pale);\r\n  }\r\n\r\n  .sccr-light-cta h3 {\r\n    font-size: 22px !important;\r\n  }\r\n\r\n  .sccr-light-cta-actions {\r\n    margin-top: 18px;\r\n  }\r\n\r\n  .sccr-button,\r\n  .sccr-button:visited {\r\n    display: inline-flex;\r\n    min-height: 46px;\r\n    padding: 12px 19px;\r\n    border: 1px solid var(--sccr-blue);\r\n    border-radius: 8px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    color: var(--sccr-white) !important;\r\n    background: var(--sccr-blue);\r\n    font-size: 14px;\r\n    font-weight: 800;\r\n    line-height: 1.3;\r\n    text-align: center;\r\n    text-decoration: none !important;\r\n  }\r\n\r\n  .sccr-button:hover {\r\n    color: var(--sccr-white) !important;\r\n    background: var(--sccr-blue-dark);\r\n  }\r\n\r\n  .sccr-button span,\r\n  .sccr-button:visited span,\r\n  .sccr-button:hover span,\r\n  .sccr-button.leeyee-site-popup-btn span {\r\n    display: inline-block !important;\r\n    color: #ffffff !important;\r\n    opacity: 1 !important;\r\n  }\r\n\r\n  .sccr-faq {\r\n    display: grid;\r\n    gap: 11px;\r\n    margin-top: 23px;\r\n  }\r\n\r\n  .sccr-faq details {\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 10px;\r\n    background: var(--sccr-white);\r\n  }\r\n\r\n  .sccr-faq summary {\r\n    position: relative;\r\n    padding: 17px 50px 17px 19px;\r\n    color: #173653;\r\n    cursor: pointer;\r\n    font-size: 16px;\r\n    font-weight: 800;\r\n    line-height: 1.45;\r\n    list-style: none;\r\n  }\r\n\r\n  .sccr-faq summary::-webkit-details-marker {\r\n    display: none;\r\n  }\r\n\r\n  .sccr-faq summary::after {\r\n    position: absolute;\r\n    top: 50%;\r\n    right: 18px;\r\n    display: flex;\r\n    width: 26px;\r\n    height: 26px;\r\n    border-radius: 7px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    color: var(--sccr-blue);\r\n    background: var(--sccr-blue-soft);\r\n    font-size: 17px;\r\n    content: \"+\";\r\n    transform: translateY(-50%);\r\n  }\r\n\r\n  .sccr-faq details[open] summary::after {\r\n    content: \"\u2212\";\r\n  }\r\n\r\n  .sccr-faq-answer {\r\n    padding: 0 19px 18px;\r\n    color: var(--sccr-muted);\r\n    font-size: 15px;\r\n  }\r\n\r\n  .sccr-related-list {\r\n    display: grid;\r\n    gap: 9px;\r\n    margin: 20px 0 0;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .sccr-related-list li {\r\n    padding: 13px 15px;\r\n    border-left: 3px solid var(--sccr-blue);\r\n    background: var(--sccr-blue-pale);\r\n  }\r\n\r\n  .sccr-related-list a {\r\n    font-weight: 800;\r\n    text-decoration: none;\r\n  }\r\n\r\n  .sccr-related-list span {\r\n    display: block;\r\n    margin-top: 2px;\r\n    color: var(--sccr-muted);\r\n    font-size: 13px;\r\n  }\r\n\r\n  .sccr-references {\r\n    padding: 56px 0;\r\n    border-top: 1px solid var(--sccr-border);\r\n    background: #f7f9fb;\r\n  }\r\n\r\n  .sccr-reference-list {\r\n    display: grid;\r\n    gap: 10px;\r\n    margin: 22px 0 0;\r\n    padding: 0;\r\n    counter-reset: sccr-reference;\r\n    list-style: none;\r\n  }\r\n\r\n  .sccr-reference-list li {\r\n    position: relative;\r\n    padding: 13px 15px 13px 47px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 9px;\r\n    background: var(--sccr-white);\r\n    counter-increment: sccr-reference;\r\n    font-size: 13px;\r\n    line-height: 1.58;\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .sccr-reference-list li::before {\r\n    position: absolute;\r\n    top: 12px;\r\n    left: 12px;\r\n    display: flex;\r\n    width: 25px;\r\n    height: 25px;\r\n    border-radius: 6px;\r\n    align-items: center;\r\n    justify-content: center;\r\n    color: var(--sccr-white);\r\n    background: var(--sccr-blue);\r\n    font-size: 10px;\r\n    font-weight: 900;\r\n    content: counter(sccr-reference);\r\n  }\r\n\r\n  .sccr-reference-list a {\r\n    font-weight: 700;\r\n    overflow-wrap: anywhere;\r\n  }\r\n\r\n  .sccr-brand-note {\r\n    margin-top: 25px;\r\n    padding-top: 20px;\r\n    border-top: 1px solid var(--sccr-border);\r\n    color: var(--sccr-muted);\r\n    font-size: 13px;\r\n    line-height: 1.65;\r\n  }\r\n\r\n  .sccr-brand-note strong {\r\n    color: #173653;\r\n  }\r\n\r\n  .sccr-revision {\r\n    margin-top: 22px;\r\n    border: 1px solid var(--sccr-border);\r\n    border-radius: 9px;\r\n    background: var(--sccr-white);\r\n  }\r\n\r\n  .sccr-revision summary {\r\n    position: relative;\r\n    padding: 14px 44px 14px 16px;\r\n    color: #173653;\r\n    cursor: pointer;\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    list-style: none;\r\n  }\r\n\r\n  .sccr-revision summary::-webkit-details-marker {\r\n    display: none;\r\n  }\r\n\r\n  .sccr-revision summary::after {\r\n    position: absolute;\r\n    top: 50%;\r\n    right: 16px;\r\n    color: var(--sccr-blue);\r\n    font-size: 18px;\r\n    content: \"+\";\r\n    transform: translateY(-50%);\r\n  }\r\n\r\n  .sccr-revision[open] summary::after {\r\n    content: \"\u2212\";\r\n  }\r\n\r\n  .sccr-revision-body {\r\n    padding: 0 16px 16px;\r\n    color: var(--sccr-muted);\r\n    font-size: 13px;\r\n  }\r\n\r\n  #leeyee-spd-sccr-article :focus-visible {\r\n    outline: 3px solid #68b8f6;\r\n    outline-offset: 3px;\r\n  }\r\n\r\n  @media (max-width: 1440px) {\r\n    .sccr-article-shell {\r\n      width: min(calc(100% - 44px), var(--sccr-content));\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1366px) {\r\n    .sccr-article-header {\r\n      padding-top: 38px;\r\n    }\r\n\r\n    .sccr-section {\r\n      padding-top: 54px;\r\n      padding-bottom: 54px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1280px) {\r\n    .sccr-article-shell {\r\n      width: min(calc(100% - 40px), 940px);\r\n    }\r\n  }\r\n\r\n  @media (max-width: 1024px) {\r\n    .sccr-article-shell {\r\n      width: min(calc(100% - 38px), 900px);\r\n    }\r\n\r\n    .sccr-key-points {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n\r\n    .sccr-project-details {\r\n      grid-template-columns: repeat(2, minmax(0, 1fr));\r\n    }\r\n  }\r\n\r\n  @media (max-width: 912px) {\r\n    .sccr-article-lead {\r\n      font-size: 19px;\r\n    }\r\n\r\n    .sccr-toc ol {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 820px) {\r\n    #leeyee-spd-sccr-article {\r\n      font-size: 16px;\r\n    }\r\n\r\n    #leeyee-spd-sccr-article h2 {\r\n      font-size: 29px;\r\n    }\r\n\r\n    .sccr-two-columns {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .sccr-steps {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 768px) {\r\n    .sccr-article-shell {\r\n      width: min(calc(100% - 32px), 720px);\r\n    }\r\n\r\n    .sccr-section {\r\n      padding-top: 48px;\r\n      padding-bottom: 48px;\r\n    }\r\n\r\n    .sccr-key-points {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .sccr-checklist {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 600px) {\r\n    .sccr-article-shell {\r\n      width: min(calc(100% - 26px), 560px);\r\n    }\r\n\r\n    .sccr-article-header {\r\n      padding-top: 30px;\r\n      padding-bottom: 20px;\r\n    }\r\n\r\n    .sccr-article-lead {\r\n      font-size: 17px;\r\n      line-height: 1.62;\r\n    }\r\n\r\n    .sccr-section {\r\n      padding-top: 42px;\r\n      padding-bottom: 42px;\r\n    }\r\n\r\n    #leeyee-spd-sccr-article h2 {\r\n      font-size: 27px;\r\n    }\r\n\r\n    #leeyee-spd-sccr-article h3 {\r\n      font-size: 20px;\r\n    }\r\n\r\n    .sccr-quick-answer,\r\n    .sccr-toc,\r\n    .sccr-evidence,\r\n    .sccr-light-cta {\r\n      padding: 21px;\r\n    }\r\n\r\n    .sccr-formula {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .sccr-formula-symbol {\r\n      min-height: 46px;\r\n    }\r\n\r\n    .sccr-formula-box {\r\n      min-height: 82px;\r\n    }\r\n\r\n    .sccr-project-details {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .sccr-table-wrap {\r\n      border: 0;\r\n      border-radius: 0;\r\n      overflow: visible;\r\n      background: transparent;\r\n      box-shadow: none;\r\n    }\r\n\r\n    .sccr-table,\r\n    .sccr-table tbody,\r\n    .sccr-table tr,\r\n    .sccr-table td {\r\n      display: block;\r\n      width: 100%;\r\n    }\r\n\r\n    .sccr-table thead {\r\n      position: absolute;\r\n      width: 1px;\r\n      height: 1px;\r\n      margin: -1px;\r\n      padding: 0;\r\n      overflow: hidden;\r\n      clip: rect(0 0 0 0);\r\n      white-space: nowrap;\r\n      border: 0;\r\n    }\r\n\r\n    .sccr-table {\r\n      min-width: 0;\r\n      table-layout: auto;\r\n    }\r\n\r\n    .sccr-table tr {\r\n      margin-bottom: 13px;\r\n      border: 1px solid var(--sccr-border);\r\n      border-radius: 11px;\r\n      overflow: hidden;\r\n      background: var(--sccr-white);\r\n      box-shadow: var(--sccr-shadow);\r\n    }\r\n\r\n    .sccr-table td,\r\n    .sccr-table tbody tr:nth-child(even) td,\r\n    .sccr-table tbody tr:hover td {\r\n      position: relative;\r\n      min-height: 43px;\r\n      padding: 11px 12px 11px 44%;\r\n      border: 0;\r\n      border-bottom: 1px solid var(--sccr-border);\r\n      background: var(--sccr-white);\r\n      text-align: left;\r\n    }\r\n\r\n    .sccr-table td:last-child {\r\n      border-bottom: 0;\r\n    }\r\n\r\n    .sccr-table td::before {\r\n      position: absolute;\r\n      top: 11px;\r\n      left: 12px;\r\n      width: 38%;\r\n      color: var(--sccr-blue);\r\n      font-size: 11px;\r\n      font-weight: 800;\r\n      line-height: 1.35;\r\n      text-transform: uppercase;\r\n      content: attr(data-label);\r\n    }\r\n\r\n    .sccr-button {\r\n      width: 100%;\r\n    }\r\n\r\n    .sccr-figure {\r\n      padding: 7px;\r\n    }\r\n\r\n    .sccr-figure figcaption {\r\n      font-size: 12px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 540px) {\r\n    .sccr-alert {\r\n      grid-template-columns: 37px minmax(0, 1fr);\r\n      gap: 12px;\r\n      padding: 18px;\r\n    }\r\n\r\n    .sccr-alert-icon {\r\n      width: 35px;\r\n      height: 35px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 480px) {\r\n    .sccr-article-shell {\r\n      width: min(calc(100% - 22px), 450px);\r\n    }\r\n\r\n    #leeyee-spd-sccr-article h2 {\r\n      font-size: 25px;\r\n    }\r\n\r\n    .sccr-quick-answer h2 {\r\n      font-size: 23px !important;\r\n    }\r\n\r\n    .sccr-quick-answer p {\r\n      font-size: 16px;\r\n    }\r\n\r\n    .sccr-key-point,\r\n    .sccr-plain-box,\r\n    .sccr-step {\r\n      padding: 18px;\r\n    }\r\n\r\n    .sccr-step {\r\n      grid-template-columns: 37px minmax(0, 1fr);\r\n    }\r\n\r\n    .sccr-step-number {\r\n      width: 35px;\r\n      height: 35px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 430px) {\r\n    .sccr-article-meta {\r\n      display: grid;\r\n      gap: 5px;\r\n    }\r\n\r\n    .sccr-toc {\r\n      padding: 19px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 414px) {\r\n    .sccr-section {\r\n      padding-top: 39px;\r\n      padding-bottom: 39px;\r\n    }\r\n\r\n    .sccr-equation {\r\n      font-size: 15px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 390px) {\r\n    .sccr-alert {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .sccr-table td {\r\n      padding-left: 42%;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 375px) {\r\n    #leeyee-spd-sccr-article {\r\n      font-size: 15px;\r\n    }\r\n\r\n    #leeyee-spd-sccr-article h2 {\r\n      font-size: 24px;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 360px) {\r\n    .sccr-article-shell {\r\n      width: calc(100% - 18px);\r\n    }\r\n\r\n    .sccr-table td {\r\n      padding-top: 34px;\r\n      padding-left: 12px;\r\n    }\r\n\r\n    .sccr-table td::before {\r\n      top: 9px;\r\n      width: calc(100% - 24px);\r\n    }\r\n  }\r\n\r\n  @media (max-width: 320px) {\r\n    #leeyee-spd-sccr-article h2 {\r\n      font-size: 22px;\r\n    }\r\n\r\n    .sccr-step {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n\r\n  @media (prefers-reduced-motion: reduce) {\r\n    #leeyee-spd-sccr-article *,\r\n    #leeyee-spd-sccr-article *::before,\r\n    #leeyee-spd-sccr-article *::after {\r\n      scroll-behavior: auto !important;\r\n      transition-duration: 0.01ms !important;\r\n      animation-duration: 0.01ms !important;\r\n      animation-iteration-count: 1 !important;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<div id=\"leeyee-spd-sccr-article\">\r\n  <article itemscope itemtype=\"https:\/\/schema.org\/TechArticle\">\r\n    <meta itemprop=\"headline\" content=\"SPD SCCR Rating Guide for Panel Builders and OEM Buyers\">\r\n    <meta itemprop=\"description\" content=\"Compare SPD SCCR or Isccr with available fault current, verify backup protection and certificates, and avoid panel SCCR errors in OEM projects.\">\r\n    <meta itemprop=\"dateModified\" content=\"2026-07-23\">\r\n    <meta itemprop=\"mainEntityOfPage\" content=\"https:\/\/www.cnspd.com\/spd-sccr-rating\/\">\r\n\r\n    <header class=\"sccr-article-header\">\r\n      <div class=\"sccr-article-shell\">\r\n        <div class=\"sccr-article-category\">Panel Builder and OEM Engineering Guide<\/div>\r\n\r\n        <p class=\"sccr-article-lead\">\r\n          An SPD can have a high surge-current rating and still be unsuitable for the available short-circuit current inside a distribution board or industrial control panel. This guide explains how panel builders and OEM buyers should verify SCCR, Isccr, upstream protection and the complete panel rating before approving a model.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-article-meta\">\r\n          <span><strong>Updated:<\/strong> July 23, 2026<\/span>\r\n          <span><strong>For:<\/strong> Panel builders, OEM buyers, engineers and project procurement<\/span>\r\n          <span><strong>Reading time:<\/strong> Approximately 14 minutes<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"sccr-quick-answer\" id=\"quick-answer\">\r\n          <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#quick-answer\" >Quick Answer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#contents\" >Contents<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#what-do-sccr-and-isccr-mean-on-an-spd\" >What Do SCCR and Isccr Mean on an SPD?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#sccr-isccr-imax-in-and-iimp-are-not-interchangeable\" >SCCR, Isccr, Imax, In and Iimp Are Not Interchangeable<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#sccr-vs-aic-or-air\" >SCCR vs AIC or AIR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#use-the-available-fault-current-at-the-actual-spd-location\" >Use the Available Fault Current at the Actual SPD Location<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#why-the-backup-fuse-or-circuit-breaker-matters\" >Why the Backup Fuse or Circuit Breaker Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#a-high-sccr-spd-does-not-give-the-complete-panel-the-same-sccr\" >A High-SCCR SPD Does Not Give the Complete Panel the Same SCCR<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#illustrative-project-selection-example\" >Illustrative Project Selection Example<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#how-to-verify-the-datasheet-certificate-and-installation-conditions\" >How to Verify the Datasheet, Certificate and Installation Conditions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#how-leeyee-documents-sccr-and-isccr\" >How LEEYEE Documents SCCR and Isccr<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#spd-sccr-and-isccr-rfq-checklist\" >SPD SCCR and Isccr RFQ Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#related-spd-selection-guides\" >Related SPD Selection Guides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer\"><\/span>Quick Answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p>\r\n            The available fault current at the SPD installation point must not exceed the SPD\u2019s declared SCCR or Isccr.\r\n          <\/p>\r\n\r\n          <p>\r\n            This comparison is valid only when the SPD is used at the declared voltage and with the fuse, circuit breaker, wiring arrangement and other conditions stated in its technical documentation.\r\n          <\/p>\r\n\r\n          <div class=\"sccr-formula\" aria-label=\"Basic SPD SCCR selection formula\">\r\n            <div class=\"sccr-formula-box\">\r\n              <span>Electrical system<\/span>\r\n              <strong>Available fault current at the SPD location<\/strong>\r\n            <\/div>\r\n\r\n            <div class=\"sccr-formula-symbol\" aria-hidden=\"true\">\u2264<\/div>\r\n\r\n            <div class=\"sccr-formula-box\">\r\n              <span>SPD documentation<\/span>\r\n              <strong>Declared SCCR or Isccr<\/strong>\r\n            <\/div>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <nav class=\"sccr-toc\" aria-label=\"Article contents\">\r\n          <h2><span class=\"ez-toc-section\" id=\"contents\"><\/span>Contents<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <ol>\r\n            <li><a href=\"#what-is-sccr\">What SCCR and Isccr mean<\/a><\/li>\r\n            <li><a href=\"#rating-comparison\">SCCR, Isccr, Imax, In and Iimp<\/a><\/li>\r\n            <li><a href=\"#sccr-vs-aic\">SCCR vs AIC or AIR<\/a><\/li>\r\n            <li><a href=\"#fault-current\">Available fault current at the SPD location<\/a><\/li>\r\n            <li><a href=\"#backup-protection\">Backup fuse and circuit-breaker conditions<\/a><\/li>\r\n            <li><a href=\"#panel-sccr\">Why SPD SCCR is not panel SCCR<\/a><\/li>\r\n            <li><a href=\"#project-example\">Project selection example<\/a><\/li>\r\n            <li><a href=\"#verification\">Datasheet and certificate verification<\/a><\/li>\r\n            <li><a href=\"#leeyee-evidence\">LEEYEE technical evidence<\/a><\/li>\r\n            <li><a href=\"#rfq-checklist\">OEM and panel-builder RFQ checklist<\/a><\/li>\r\n            <li><a href=\"#faq\">Frequently asked questions<\/a><\/li>\r\n            <li><a href=\"#references\">References<\/a><\/li>\r\n          <\/ol>\r\n        <\/nav>\r\n      <\/div>\r\n    <\/header>\r\n\r\n    <section class=\"sccr-section sccr-anchor\" id=\"what-is-sccr\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"what-do-sccr-and-isccr-mean-on-an-spd\"><\/span>What Do SCCR and Isccr Mean on an SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          The short-circuit current rating, or <strong>SCCR<\/strong>, states the maximum declared RMS symmetrical fault current at which an AC surge protective device is suitable for use at its declared voltage and under its evaluated conditions.\r\n          <a class=\"sccr-source\" href=\"#ref-1\" aria-label=\"Reference 1\">[1]<\/a>\r\n        <\/p>\r\n\r\n        <p>\r\n          IEC-oriented documentation may use <strong>Isccr<\/strong>. It represents the maximum prospective network short-circuit current for which the SPD is rated together with its stated upstream overcurrent protective device.\r\n          <a class=\"sccr-source\" href=\"#ref-2\" aria-label=\"Reference 2\">[2]<\/a>\r\n        <\/p>\r\n\r\n        <p>\r\n          Both values address short-circuit safety. They do not describe how much lightning surge current the SPD can discharge.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-key-points\">\r\n          <article class=\"sccr-key-point\">\r\n            <h3>Project-side value<\/h3>\r\n            <p>\r\n              The available fault current comes from the electrical installation and must be determined at the actual SPD connection point.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-key-point\">\r\n            <h3>Product-side value<\/h3>\r\n            <p>\r\n              SCCR or Isccr comes from the SPD marking, datasheet, installation instructions, certificate or applicable test documentation.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-key-point\">\r\n            <h3>Approval condition<\/h3>\r\n            <p>\r\n              The product value is meaningful only when the documented voltage, protective device and installation conditions are followed.\r\n            <\/p>\r\n          <\/article>\r\n        <\/div>\r\n\r\n        <figure class=\"sccr-figure\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-short-circuit-protection-architecture.webp\"\r\n            alt=\"SPD SCCR and prospective short-circuit current protection architecture for electrical panels\"\r\n            width=\"1448\"\r\n            height=\"1086\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n\r\n          <figcaption>\r\n            The SPD is normally connected in parallel. Its short-circuit suitability must be checked at that branch connection and with the protective arrangement stated by the manufacturer.\r\n            <br>\r\n            <a class=\"sccr-full-image-link\" ref=\"magnificPopup\" href=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-short-circuit-protection-architecture.webp\" target=\"_blank\" rel=\"noopener noreferrer\">Open the full-size diagram<\/a>\r\n          <\/figcaption>\r\n        <\/figure>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-section--soft sccr-anchor\" id=\"rating-comparison\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"sccr-isccr-imax-in-and-iimp-are-not-interchangeable\"><\/span>SCCR, Isccr, Imax, In and Iimp Are Not Interchangeable<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"sccr-section-intro\">\r\n          Several SPD parameters use kA. They describe different electrical events and answer different project questions.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-table-wrap\">\r\n          <table class=\"sccr-table\">\r\n            <thead>\r\n              <tr>\r\n                <th scope=\"col\" style=\"width:15%;\">Parameter<\/th>\r\n                <th scope=\"col\" style=\"width:34%;\">What It Represents<\/th>\r\n                <th scope=\"col\" style=\"width:31%;\">Project Question<\/th>\r\n                <th scope=\"col\" style=\"width:20%;\">Do Not Confuse It With<\/th>\r\n              <\/tr>\r\n            <\/thead>\r\n\r\n            <tbody>\r\n              <tr>\r\n                <td data-label=\"Parameter\">SCCR<\/td>\r\n                <td data-label=\"What It Represents\">Short-circuit suitability at a declared AC voltage and under evaluated conditions.<\/td>\r\n                <td data-label=\"Project Question\">Can the SPD be installed where this available fault-current level exists?<\/td>\r\n                <td data-label=\"Do Not Confuse It With\">Imax, In or breaker interrupting rating.<\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td data-label=\"Parameter\">Isccr<\/td>\r\n                <td data-label=\"What It Represents\">Maximum prospective short-circuit current for which the SPD is rated with the stated upstream OCPD.<\/td>\r\n                <td data-label=\"Project Question\">Is the SPD suitable with the documented fuse or circuit breaker?<\/td>\r\n                <td data-label=\"Do Not Confuse It With\">An unconditional stand-alone value.<\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td data-label=\"Parameter\">In<\/td>\r\n                <td data-label=\"What It Represents\">Nominal discharge current, normally tested with an 8\/20 \u03bcs waveform.<\/td>\r\n                <td data-label=\"Project Question\">What nominal surge-current test duty has the SPD passed?<\/td>\r\n                <td data-label=\"Do Not Confuse It With\">Power-frequency fault current.<\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td data-label=\"Parameter\">Imax<\/td>\r\n                <td data-label=\"What It Represents\">Maximum discharge current, normally stated with an 8\/20 \u03bcs waveform.<\/td>\r\n                <td data-label=\"Project Question\">What maximum Type 2 surge current is declared?<\/td>\r\n                <td data-label=\"Do Not Confuse It With\">SCCR or Isccr.<\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td data-label=\"Parameter\">Iimp<\/td>\r\n                <td data-label=\"What It Represents\">Impulse discharge current, normally stated with a 10\/350 \u03bcs waveform.<\/td>\r\n                <td data-label=\"Project Question\">What Type 1 lightning-current duty is declared?<\/td>\r\n                <td data-label=\"Do Not Confuse It With\">Available network fault current.<\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td data-label=\"Parameter\">Up<\/td>\r\n                <td data-label=\"What It Represents\">Voltage protection level established under specified IEC test conditions.<\/td>\r\n                <td data-label=\"Project Question\">What voltage level may appear at the SPD terminals during the test event?<\/td>\r\n                <td data-label=\"Do Not Confuse It With\">A current rating.<\/td>\r\n              <\/tr>\r\n\r\n              <tr>\r\n                <td data-label=\"Parameter\">VPR<\/td>\r\n                <td data-label=\"What It Represents\">UL-oriented voltage protection rating.<\/td>\r\n                <td data-label=\"Project Question\">What limiting-voltage category appears in the applicable UL record?<\/td>\r\n                <td data-label=\"Do Not Confuse It With\">IEC Up as an automatically identical value.<\/td>\r\n              <\/tr>\r\n            <\/tbody>\r\n          <\/table>\r\n        <\/div>\r\n\r\n        <figure class=\"sccr-figure\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-isccr-surge-rating-comparison.webp\"\r\n            alt=\"Comparison of SPD SCCR, Isccr, In, Imax, Iimp and Up electrical ratings\"\r\n            width=\"1448\"\r\n            height=\"1086\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n\r\n          <figcaption>\r\n            SCCR and Isccr address fault-current safety. In, Imax and Iimp address surge-current performance. Up addresses voltage limitation.\r\n            <br>\r\n            <a class=\"sccr-full-image-link\" ref=\"magnificPopup\" href=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-isccr-surge-rating-comparison.webp\" target=\"_blank\" rel=\"noopener noreferrer\">Open the full-size diagram<\/a>\r\n          <\/figcaption>\r\n        <\/figure>\r\n\r\n        <div class=\"sccr-alert sccr-alert--warning\">\r\n          <div class=\"sccr-alert-icon\" aria-hidden=\"true\">!<\/div>\r\n          <div>\r\n            <h3>Two common procurement mistakes<\/h3>\r\n            <p>\r\n              A 40 kA Imax SPD does not automatically have a 40 kA SCCR. A 100 kA SCCR does not mean that the SPD can discharge a 100 kA lightning surge.\r\n            <\/p>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-anchor\" id=\"sccr-vs-aic\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"sccr-vs-aic-or-air\"><\/span>SCCR vs AIC or AIR<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          SCCR and breaker interrupting capacity solve different safety questions. NEMA specifically distinguishes the SPD short-circuit current rating from the ampere interrupting capacity of an overcurrent protective device.\r\n          <a class=\"sccr-source\" href=\"#ref-3\" aria-label=\"Reference 3\">[3]<\/a>\r\n        <\/p>\r\n\r\n        <div class=\"sccr-two-columns\">\r\n          <article class=\"sccr-plain-box\">\r\n            <h3>SPD SCCR<\/h3>\r\n            <p>\r\n              States the fault-current level at which the SPD is suitable for use under its evaluated conditions.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-plain-box\">\r\n            <h3>Fuse or Breaker AIC \/ AIR<\/h3>\r\n            <p>\r\n              States the maximum fault current the protective device can safely interrupt at its rated voltage.\r\n            <\/p>\r\n          <\/article>\r\n        <\/div>\r\n\r\n        <div class=\"sccr-alert sccr-alert--danger\">\r\n          <div class=\"sccr-alert-icon\" aria-hidden=\"true\">\u00d7<\/div>\r\n          <div>\r\n            <h3>Both ratings must be adequate<\/h3>\r\n            <p>\r\n              A high-AIC breaker does not automatically increase an SPD\u2019s SCCR. A high-SCCR SPD does not increase the breaker\u2019s interrupting capacity.\r\n            <\/p>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-section--soft sccr-anchor\" id=\"fault-current\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"use-the-available-fault-current-at-the-actual-spd-location\"><\/span>Use the Available Fault Current at the Actual SPD Location<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          Available fault current can change between the transformer, main switchboard, feeder and downstream control panel.\r\n        <\/p>\r\n\r\n        <p>\r\n          Transformer impedance, source strength, cable length, conductor size, busbar impedance and upstream current-limiting devices can all affect the value.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-two-columns\">\r\n          <article class=\"sccr-plain-box\">\r\n            <h3>Quick transformer-secondary estimate<\/h3>\r\n\r\n            <p>\r\n              For a three-phase transformer, first estimate the secondary full-load current:\r\n            <\/p>\r\n\r\n            <div class=\"sccr-equation\">\r\n              I<sub>FL<\/sub> = (kVA \u00d7 1000) \u00f7 (\u221a3 \u00d7 V<sub>LL<\/sub>)\r\n            <\/div>\r\n\r\n            <p>\r\n              Then estimate the symmetrical bolted-fault current at the transformer secondary terminals:\r\n            <\/p>\r\n\r\n            <div class=\"sccr-equation\">\r\n              I<sub>SC<\/sub> \u2248 I<sub>FL<\/sub> \u00f7 (Z% \u00f7 100)\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-plain-box\">\r\n            <h3>Illustrative example<\/h3>\r\n\r\n            <p>\r\n              A 500 kVA, 400 V three-phase transformer with 6% impedance has a full-load current of approximately 722 A.\r\n            <\/p>\r\n\r\n            <p>\r\n              Dividing 722 A by 0.06 gives an estimated transformer-terminal fault current of approximately 12.0 kA.\r\n              <a class=\"sccr-source\" href=\"#ref-4\" aria-label=\"Reference 4\">[4]<\/a>\r\n            <\/p>\r\n\r\n            <p>\r\n              This is only a screening estimate. It does not replace a formal short-circuit study and may not represent the value at a downstream SPD.\r\n            <\/p>\r\n          <\/article>\r\n        <\/div>\r\n\r\n        <div class=\"sccr-alert sccr-alert--warning\">\r\n          <div class=\"sccr-alert-icon\" aria-hidden=\"true\">!<\/div>\r\n          <div>\r\n            <h3>Do not use the breaker rating as the project fault current<\/h3>\r\n            <p>\r\n              A breaker marked 50 kA may be capable of interrupting that level. It does not prove that the installation actually has 50 kA available fault current.\r\n            <\/p>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-anchor\" id=\"backup-protection\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"why-the-backup-fuse-or-circuit-breaker-matters\"><\/span>Why the Backup Fuse or Circuit Breaker Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          An Isccr value may depend on a specific upstream fuse or circuit breaker. The number should not be separated from the test and installation conditions under which it was established.\r\n          <a class=\"sccr-source\" href=\"#ref-2\" aria-label=\"Reference 2\">[2]<\/a>\r\n        <\/p>\r\n\r\n        <p>\r\n          If an SPD develops a low-impedance failure path, power-frequency current can flow through it. The coordinated internal and external protective arrangement must disconnect the failed SPD safely.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-two-columns\">\r\n          <article class=\"sccr-plain-box\">\r\n            <h3>Ask the complete question<\/h3>\r\n            <p>\r\n              \u201cUnder which fuse, breaker, voltage and wiring conditions was this SCCR or Isccr established?\u201d\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-plain-box\">\r\n            <h3>Verify these OCPD details<\/h3>\r\n            <ul>\r\n              <li>Fuse or breaker type<\/li>\r\n              <li>Maximum permitted current rating<\/li>\r\n              <li>Fuse class or breaker characteristics<\/li>\r\n              <li>Interrupting capacity<\/li>\r\n              <li>Branch or through-wiring arrangement<\/li>\r\n            <\/ul>\r\n          <\/article>\r\n        <\/div>\r\n\r\n        <div class=\"sccr-alert sccr-alert--info\">\r\n          <div class=\"sccr-alert-icon\" aria-hidden=\"true\">i<\/div>\r\n          <div>\r\n            <h3>Equal ampere ratings do not prove equal protection<\/h3>\r\n            <p>\r\n              A 125 A fuse and a 125 A molded-case circuit breaker can have different clearing times, let-through energy and current-limiting performance.\r\n            <\/p>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-section--soft sccr-anchor\" id=\"panel-sccr\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"a-high-sccr-spd-does-not-give-the-complete-panel-the-same-sccr\"><\/span>A High-SCCR SPD Does Not Give the Complete Panel the Same SCCR<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          The SPD rating applies to the SPD under its evaluated conditions. The panel rating applies to the complete industrial control panel or electrical assembly.\r\n        <\/p>\r\n\r\n        <p>\r\n          UL identifies Supplement SB of UL 508A as an accepted method for determining industrial control panel SCCR.\r\n          <a class=\"sccr-source\" href=\"#ref-5\" aria-label=\"Reference 5\">[5]<\/a>\r\n        <\/p>\r\n\r\n        <p>\r\n          The assessment may include disconnect switches, fuses, circuit breakers, contactors, overload relays, motor starters, distribution blocks, terminals, busbars, drives and SPDs.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-alert sccr-alert--danger\">\r\n          <div class=\"sccr-alert-icon\" aria-hidden=\"true\">\u00d7<\/div>\r\n          <div>\r\n            <h3>Do not copy the SPD value onto the panel nameplate<\/h3>\r\n            <p>\r\n              A 100 kA or 200 kA SCCR SPD does not automatically make the complete panel suitable for 100 kA or 200 kA available fault current.\r\n            <\/p>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-anchor\" id=\"project-example\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"illustrative-project-selection-example\"><\/span>Illustrative Project Selection Example<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          The example below shows why Imax cannot be used as a substitute for Isccr.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-project-details\">\r\n          <div class=\"sccr-project-detail\">\r\n            <span>System<\/span>\r\n            <strong>400\/230 V AC<\/strong>\r\n          <\/div>\r\n\r\n          <div class=\"sccr-project-detail\">\r\n            <span>Earthing Arrangement<\/span>\r\n            <strong>TN-S<\/strong>\r\n          <\/div>\r\n\r\n          <div class=\"sccr-project-detail\">\r\n            <span>SPD Location<\/span>\r\n            <strong>Main Distribution Board<\/strong>\r\n          <\/div>\r\n\r\n          <div class=\"sccr-project-detail\">\r\n            <span>Available Fault Current<\/span>\r\n            <strong>36 kA RMS<\/strong>\r\n          <\/div>\r\n        <\/div>\r\n\r\n        <div class=\"sccr-two-columns\">\r\n          <article class=\"sccr-plain-box sccr-option\">\r\n            <span class=\"sccr-status\">Not Suitable<\/span>\r\n\r\n            <h3>Illustrative Option A<\/h3>\r\n\r\n            <ul class=\"sccr-spec-list\">\r\n              <li><span>Uc<\/span><strong>275 V AC<\/strong><\/li>\r\n              <li><span>In<\/span><strong>20 kA<\/strong><\/li>\r\n              <li><span>Imax<\/span><strong>40 kA<\/strong><\/li>\r\n              <li><span>Isccr<\/span><strong>25 kA<\/strong><\/li>\r\n              <li><span>Backup Fuse<\/span><strong>125 A gG maximum<\/strong><\/li>\r\n            <\/ul>\r\n\r\n            <p>\r\n              The 25 kA Isccr is lower than the 36 kA available fault current. The 40 kA Imax value does not correct this problem.\r\n            <\/p>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-plain-box sccr-option sccr-option--pass\">\r\n            <span class=\"sccr-status\">Potentially Suitable<\/span>\r\n\r\n            <h3>Illustrative Option B<\/h3>\r\n\r\n            <ul class=\"sccr-spec-list\">\r\n              <li><span>Uc<\/span><strong>275 V AC<\/strong><\/li>\r\n              <li><span>In<\/span><strong>20 kA<\/strong><\/li>\r\n              <li><span>Imax<\/span><strong>40 kA<\/strong><\/li>\r\n              <li><span>Isccr<\/span><strong>50 kA<\/strong><\/li>\r\n              <li><span>Backup Fuse<\/span><strong>125 A gG maximum<\/strong><\/li>\r\n            <\/ul>\r\n\r\n            <p>\r\n              The 50 kA Isccr exceeds the 36 kA project value. Final approval still depends on the exact fuse, voltage, circuit, certificate scope and panel review.\r\n            <\/p>\r\n          <\/article>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-section--soft sccr-anchor\" id=\"verification\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"how-to-verify-the-datasheet-certificate-and-installation-conditions\"><\/span>How to Verify the Datasheet, Certificate and Installation Conditions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"sccr-section-intro\">\r\n          Use the exact model and configuration. Do not approve an SPD from one isolated number or from a certificate for a similar-looking model.\r\n        <\/p>\r\n\r\n        <figure class=\"sccr-figure\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-oem-verification-workflow.webp\"\r\n            alt=\"OEM workflow for verifying SPD SCCR, backup protection, certificates and panel requirements\"\r\n            width=\"1448\"\r\n            height=\"1086\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n\r\n          <figcaption>\r\n            A practical SCCR and Isccr verification workflow for panel builders, OEM buyers, engineers and project procurement teams.\r\n            <br>\r\n            <a class=\"sccr-full-image-link\" ref=\"magnificPopup\" href=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-oem-verification-workflow.webp\" target=\"_blank\" rel=\"noopener noreferrer\">Open the full-size diagram<\/a>\r\n          <\/figcaption>\r\n        <\/figure>\r\n\r\n        <div class=\"sccr-steps\">\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">01<\/div>\r\n            <div>\r\n              <h3>Define the project market<\/h3>\r\n              <p>Confirm the destination country, applicable standard, required certificate and approval route.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">02<\/div>\r\n            <div>\r\n              <h3>Confirm the electrical system<\/h3>\r\n              <p>Record the voltage, frequency, earthing arrangement and actual SPD installation point.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">03<\/div>\r\n            <div>\r\n              <h3>Obtain the fault-current value<\/h3>\r\n              <p>Use the project short-circuit study or a calculation completed by a qualified responsible party.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">04<\/div>\r\n            <div>\r\n              <h3>Identify the exact SPD model<\/h3>\r\n              <p>Confirm the full code, voltage suffix, pole arrangement, base and replaceable module.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">05<\/div>\r\n            <div>\r\n              <h3>Locate SCCR or Isccr<\/h3>\r\n              <p>Determine whether the value applies to one module, one protection mode or the complete assembly.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">06<\/div>\r\n            <div>\r\n              <h3>Verify the upstream OCPD<\/h3>\r\n              <p>Check the fuse or breaker type, rating, interrupting capacity and substitution restrictions.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">07<\/div>\r\n            <div>\r\n              <h3>Match the technical evidence<\/h3>\r\n              <p>Compare the label, datasheet, installation instructions, certificate and test documentation.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n\r\n          <article class=\"sccr-step\">\r\n            <div class=\"sccr-step-number\">08<\/div>\r\n            <div>\r\n              <h3>Review the complete panel<\/h3>\r\n              <p>Record the decision in the BOM, technical file, project submittal or sample approval record.<\/p>\r\n            <\/div>\r\n          <\/article>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-anchor\" id=\"leeyee-evidence\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"how-leeyee-documents-sccr-and-isccr\"><\/span>How LEEYEE Documents SCCR and Isccr<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          LEEYEE product and certification documents show that SCCR or Isccr must be matched to the exact series, voltage and model configuration.\r\n        <\/p>\r\n\r\n        <div class=\"sccr-evidence\">\r\n          <h3>Published first-party examples<\/h3>\r\n\r\n          <ul class=\"sccr-evidence-list\">\r\n            <li>\r\n              The LEEYEE certificate index lists <strong>LY1-C40M<\/strong> Type 2 models with an Isccr of 25 kA for the covered configurations.\r\n            <\/li>\r\n\r\n            <li>\r\n              The certificate index also lists <strong>LY1-C40 and LY1-D20<\/strong> series models with an Isccr of 25 kA within their stated certification scope.\r\n            <\/li>\r\n\r\n            <li>\r\n              The <strong>LY1-12.5\/3(S)<\/strong> product specification table publishes model-dependent SCCR values. The exact value varies by voltage and product variant.\r\n            <\/li>\r\n\r\n            <li>\r\n              The LEEYEE SPD catalogue lists backup-fuse data separately from short-circuit current ratings. Buyers should therefore request and verify both values.\r\n            <\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"sccr-alert sccr-alert--warning\">\r\n          <div class=\"sccr-alert-icon\" aria-hidden=\"true\">!<\/div>\r\n          <div>\r\n            <h3>Evidence does not transfer automatically between models<\/h3>\r\n            <p>\r\n              A certificate for one series or an SCCR shown for one voltage variant cannot be used as blanket evidence for every LEEYEE SPD.\r\n            <\/p>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-section--soft sccr-anchor\" id=\"rfq-checklist\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"spd-sccr-and-isccr-rfq-checklist\"><\/span>SPD SCCR and Isccr RFQ Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p class=\"sccr-section-intro\">\r\n          Complete project data helps the supplier identify technical conflicts before quotation, sampling or OEM approval.\r\n        <\/p>\r\n\r\n        <ul class=\"sccr-checklist\">\r\n          <li>Destination country<\/li>\r\n          <li>Required standard<\/li>\r\n          <li>Required certificate<\/li>\r\n          <li>Panel application<\/li>\r\n          <li>Nominal system voltage<\/li>\r\n          <li>Line-to-line voltage<\/li>\r\n          <li>Line-to-neutral voltage<\/li>\r\n          <li>AC frequency<\/li>\r\n          <li>Earthing arrangement<\/li>\r\n          <li>SPD installation point<\/li>\r\n          <li>Available fault current<\/li>\r\n          <li>Required panel SCCR<\/li>\r\n          <li>Upstream fuse type<\/li>\r\n          <li>Fuse rating<\/li>\r\n          <li>Circuit-breaker type<\/li>\r\n          <li>Breaker rating<\/li>\r\n          <li>Interrupting capacity<\/li>\r\n          <li>Required SPD Type<\/li>\r\n          <li>Pole configuration<\/li>\r\n          <li>Required In or Imax<\/li>\r\n          <li>Required Iimp<\/li>\r\n          <li>Required Up or VPR<\/li>\r\n          <li>Required SCCR or Isccr<\/li>\r\n          <li>Remote-contact requirement<\/li>\r\n          <li>Order quantity<\/li>\r\n          <li>OEM label and packaging<\/li>\r\n        <\/ul>\r\n\r\n        <div class=\"sccr-light-cta\">\r\n          <h3>Need to Verify an SPD for a Panel or OEM Project?<\/h3>\r\n\r\n          <p>\r\n            Send the system voltage, earthing arrangement, available fault current, upstream fuse or breaker, required SPD Type and certification requirement.\r\n          <\/p>\r\n\r\n          <p>\r\n            LEEYEE can help compare the requested parameters with the available product documentation. Final fault-current calculations, panel SCCR determination and project approval remain with the responsible engineer, panel builder or approval authority.\r\n          <\/p>\r\n\r\n          <div class=\"sccr-light-cta-actions\">\r\n            <a class=\"sccr-button leeyee-site-popup-btn\" href=\"javascript:void(0);\" role=\"button\">\r\n              <span style=\"color:#ffffff !important;\">Send Your Project Requirements<\/span>\r\n            <\/a>\r\n          <\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-anchor\" id=\"faq\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <div class=\"sccr-faq\">\r\n          <details>\r\n            <summary>Is a 40 kA Imax SPD suitable where the available fault current is 40 kA?<\/summary>\r\n            <div class=\"sccr-faq-answer\">\r\n              <p>\r\n                Not necessarily. Imax describes surge-current performance. The separately declared SCCR or Isccr must be checked against the available fault current.\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>Should SCCR or Isccr be higher than the available fault current?<\/summary>\r\n            <div class=\"sccr-faq-answer\">\r\n              <p>\r\n                It must be equal to or greater than the available fault current at the SPD installation point, subject to all stated voltage, OCPD and installation conditions.\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>Is SCCR the same as breaker AIC or AIR?<\/summary>\r\n            <div class=\"sccr-faq-answer\">\r\n              <p>\r\n                No. SCCR describes component or assembly suitability under short-circuit conditions. AIC or AIR describes the fault current an overcurrent protective device can safely interrupt.\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>Can an upstream breaker increase the SPD SCCR?<\/summary>\r\n            <div class=\"sccr-faq-answer\">\r\n              <p>\r\n                Only when the resulting combination and rating are supported by the applicable test, certification, listing or manufacturer documentation.\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>Does an internal thermal disconnector eliminate the backup fuse?<\/summary>\r\n            <div class=\"sccr-faq-answer\">\r\n              <p>\r\n                Not automatically. Follow the exact installation instructions and protective-device conditions for the selected SPD model.\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>Does a 200 kA SCCR SPD make the panel 200 kA SCCR?<\/summary>\r\n            <div class=\"sccr-faq-answer\">\r\n              <p>\r\n                No. The complete panel SCCR must be determined separately under the applicable panel or machinery procedure.\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n\r\n          <details>\r\n            <summary>What should the buyer do if the backup-protection condition is missing?<\/summary>\r\n            <div class=\"sccr-faq-answer\">\r\n              <p>\r\n                Do not approve the SPD solely from an isolated SCCR or Isccr claim. Request the exact datasheet, installation instructions and applicable certification or test evidence.\r\n              <\/p>\r\n            <\/div>\r\n          <\/details>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"sccr-section sccr-section--soft\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"related-spd-selection-guides\"><\/span>Related SPD Selection Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <ul class=\"sccr-related-list\">\r\n          <li>\r\n            <a href=\"https:\/\/www.cnspd.com\/spd-uc-selection-guide\/\">SPD Uc Selection Guide<\/a>\r\n            <span>Compare continuous operating voltage options with the actual electrical system.<\/span>\r\n          <\/li>\r\n\r\n          <li>\r\n            <a href=\"https:\/\/www.cnspd.com\/spd-imax-selection\/\">SPD Imax Selection Guide<\/a>\r\n            <span>Understand maximum discharge current without confusing it with SCCR.<\/span>\r\n          <\/li>\r\n\r\n          <li>\r\n            <a href=\"https:\/\/www.cnspd.com\/spd-in-rating-selection\/\">SPD In Rating Selection<\/a>\r\n            <span>Review nominal 8\/20 \u03bcs discharge-current requirements.<\/span>\r\n          <\/li>\r\n\r\n          <li>\r\n            <a href=\"https:\/\/www.cnspd.com\/spd-certificate-verification\/\">SPD Certificate Verification<\/a>\r\n            <span>Check exact models, standards, ratings and certificate scope.<\/span>\r\n          <\/li>\r\n\r\n          <li>\r\n            <a href=\"https:\/\/www.cnspd.com\/spd-for-distribution-board\/\">SPD for Distribution Boards<\/a>\r\n            <span>Review SPD Type, pole arrangement, backup protection and installation position.<\/span>\r\n          <\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <footer class=\"sccr-references sccr-anchor\" id=\"references\">\r\n      <div class=\"sccr-article-shell\">\r\n        <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n        <p>\r\n          Standards and certification requirements may change. Verify the edition, certificate validity and local requirements applicable to the project date and destination market.\r\n        <\/p>\r\n\r\n        <ol class=\"sccr-reference-list\">\r\n          <li id=\"ref-1\">\r\n            NEMA Surge Protection Institute, \u201cSafety-Related Information,\u201d including the definition and safety context of SPD SCCR.\r\n            <a href=\"https:\/\/www.nemasurge.org\/spd-safety\/\" target=\"_blank\" rel=\"noopener noreferrer\">View source<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-2\">\r\n            Phoenix Contact, \u201cFundamentals for Surge Protection,\u201d including the definition of Isccr and guidance on upstream overcurrent protection.\r\n            <a href=\"https:\/\/www.phoenixcontact.com\/assets\/c8428ddc-254d-40b8-a2f2-540ac13bd818\/index.html\" target=\"_blank\" rel=\"noopener noreferrer\">View technical guide<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-3\">\r\n            NEMA Surge Protection Institute, \u201cFAQs,\u201d distinguishing SCCR from AIC.\r\n            <a href=\"https:\/\/www.nemasurge.org\/faqs\/\" target=\"_blank\" rel=\"noopener noreferrer\">View source<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-4\">\r\n            Schneider Electric, \u201cHow do you calculate the maximum possible available fault current at the secondary for single-phase and three-phase transformers?\u201d\r\n            <a href=\"https:\/\/www.se.com\/us\/en\/faqs\/FA105006\/\" target=\"_blank\" rel=\"noopener noreferrer\">View calculation guidance<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-5\">\r\n            UL Solutions, information on industrial control panel SCCR determination and UL 508A Supplement SB.\r\n            <a href=\"https:\/\/www.ul.com\/resources\/short-circuit-current-ratings-combination-motor-controller-components\" target=\"_blank\" rel=\"noopener noreferrer\">View UL source<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-6\">\r\n            International Electrotechnical Commission, IEC 61643-01:2024, \u201cLow-voltage surge protective devices \u2013 Part 01: General requirements and test methods.\u201d\r\n            <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\" target=\"_blank\" rel=\"noopener noreferrer\">View standard record<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-7\">\r\n            International Electrotechnical Commission, IEC 61643-11:2025, \u201cLow-voltage surge protective devices \u2013 Part 11: Surge protective devices connected to AC low-voltage power systems.\u201d\r\n            <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener noreferrer\">View standard record<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-8\">\r\n            UL Solutions, \u201cSurge Protection Device Testing and Certification Services.\u201d\r\n            <a href=\"https:\/\/www.ul.com\/services\/surge-protection-device-testing-and-certification-services\" target=\"_blank\" rel=\"noopener noreferrer\">View UL source<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-9\">\r\n            LEEYEE Electric SPD Catalogue, including separate backup-fuse and short-circuit current rating fields.\r\n            <a href=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2024\/07\/LEEYEE-ELECTRIC-CATALOGUE%EF%BC%88SPD.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">View catalogue<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-10\">\r\n            LEEYEE Certifications, listing standards, model families and declared Isccr values for covered AC SPD series.\r\n            <a href=\"https:\/\/www.cnspd.com\/patents-certificates\/\" target=\"_blank\" rel=\"noopener noreferrer\">View certificate index<\/a>\r\n          <\/li>\r\n\r\n          <li id=\"ref-11\">\r\n            LEEYEE LY1-12.5\/3(S) product page, including model-dependent SCCR values in its specification table.\r\n            <a href=\"https:\/\/www.cnspd.com\/ly1-12-53spluggable-multi-pole-spd-product\/\" target=\"_blank\" rel=\"noopener noreferrer\">View product data<\/a>\r\n          <\/li>\r\n        <\/ol>\r\n\r\n        <div class=\"sccr-brand-note\">\r\n          <p>\r\n            <strong>LEEYEE<\/strong> is a specialized surge protection and low-voltage protection supplier, trusted for solar PV, power distribution, telecom, industrial and OEM applications.\r\n          <\/p>\r\n\r\n          <p>\r\n            <strong>CNSPD<\/strong> is LEEYEE\u2019s surge protection-focused brand platform for global buyers.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <details class=\"sccr-revision\">\r\n          <summary>Revision notes<\/summary>\r\n          <div class=\"sccr-revision-body\">\r\n            <p>\r\n              This version removes the large Hero, duplicate page title, breadcrumbs, dark full-width feature blocks and repeated sales sections. It changes the page to a white-background article layout with a short introduction, Quick Answer, contents, natural image placement, mobile table cards and one lightweight inquiry CTA.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n      <\/div>\r\n    <\/footer>\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\": \"TechArticle\",\r\n  \"headline\": \"SPD SCCR Rating Guide for Panel Builders and OEM Buyers\",\r\n  \"description\": \"Compare SPD SCCR or Isccr with available fault current, verify backup protection and certificates, and avoid panel SCCR errors in OEM projects.\",\r\n  \"mainEntityOfPage\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/www.cnspd.com\/spd-sccr-rating\/\"\r\n  },\r\n  \"dateModified\": \"2026-07-23\",\r\n  \"author\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"publisher\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"LEEYEE\",\r\n    \"url\": \"https:\/\/www.cnspd.com\/\"\r\n  },\r\n  \"image\": [\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-short-circuit-protection-architecture.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-isccr-surge-rating-comparison.webp\",\r\n    \"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-sccr-oem-verification-workflow.webp\"\r\n  ],\r\n  \"about\": [\r\n    \"SPD SCCR rating\",\r\n    \"SPD Isccr\",\r\n    \"Available fault current\",\r\n    \"SCCR versus AIC\",\r\n    \"SPD backup protection\",\r\n    \"Industrial control panel SCCR\"\r\n  ]\r\n}\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is a 40 kA Imax SPD suitable where the available fault current is 40 kA?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Not necessarily. Imax describes surge-current performance. The separately declared SCCR or Isccr must be checked against the available fault current.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Should SCCR or Isccr be higher than the available fault current?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"It must be equal to or greater than the available fault current at the SPD installation point, subject to all stated voltage, OCPD and installation conditions.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Is SCCR the same as breaker AIC or AIR?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. SCCR describes component or assembly suitability under short-circuit conditions. AIC or AIR describes the fault current an overcurrent protective device can safely interrupt.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can an upstream breaker increase the SPD SCCR?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Only when the resulting combination and rating are supported by the applicable test, certification, listing or manufacturer documentation.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Does a 200 kA SCCR SPD make the panel 200 kA SCCR?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"No. The complete panel SCCR must be determined separately under the applicable panel or machinery procedure.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Panel Builder and OEM Engineering Guide An SPD can have a high surge-current rating and still be unsuitable for the available short-circuit current inside a distribution board or industrial control panel. This guide explains how panel builders and OEM buyers should verify SCCR, Isccr, upstream protection and the complete panel rating before approving a model&#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-30370","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 v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SPD SCCR &amp; Isccr Guide: Fault Current and Panel Rating | LEEYEE<\/title>\n<meta name=\"description\" content=\"Compare SPD SCCR or Isccr with available fault current, verify backup protection and certificates, and avoid panel SCCR errors in OEM projects.\" \/>\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\/es\/spd-sccr-rating\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SPD SCCR &amp; Isccr Guide: Fault Current and Panel Rating | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Compare SPD SCCR or Isccr with available fault current, verify backup protection and certificates, and avoid panel SCCR errors in OEM projects.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/es\/spd-sccr-rating\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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