{"id":25807,"date":"2024-08-30T15:42:41","date_gmt":"2024-08-30T07:42:41","guid":{"rendered":"https:\/\/cnspd.com\/?p=25807"},"modified":"2026-06-24T17:07:29","modified_gmt":"2026-06-24T09:07:29","slug":"type-2-spd","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/typ-2-spd\/","title":{"rendered":"Typ 2 spd"},"content":{"rendered":"<section class=\"l-section wpb_row height_large\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row via_grid cols_custom laptops-cols_inherit tablets-cols_inherit mobiles-cols_1 valign_top type_default stacking_default\"><div class=\"wpb_column vc_column_container\"><div class=\"vc_column-inner\"><\/div><\/div><div class=\"w-html us_custom_d88b2178\"><style>\n  .t2spd-page {\n    --t2-blue: #004898;\n    --t2-blue-dark: #00366f;\n    --t2-light: #f5f9ff;\n    --t2-soft: #eef5fc;\n    --t2-border: #d9e7f4;\n    --t2-text: #1f2937;\n    --t2-muted: #5b6675;\n    --t2-green: #11845b;\n    --t2-red: #c2410c;\n    font-family: inherit;\n    color: var(--t2-text);\n    line-height: 1.72;\n  }\n\n  .t2spd-page * {\n    box-sizing: border-box;\n  }\n\n  .t2spd-page a {\n    color: var(--t2-blue);\n    text-decoration: none;\n  }\n\n  .t2spd-page a:hover {\n    text-decoration: underline;\n  }\n\n  .t2spd-hero {\n    background: linear-gradient(135deg, #f7fbff 0%, #eef6ff 58%, #ffffff 100%);\n    border: 1px solid var(--t2-border);\n    border-radius: 24px;\n    padding: 34px;\n    margin: 20px 0 34px;\n  }\n\n  .t2spd-kicker {\n    display: inline-flex;\n    align-items: center;\n    gap: 8px;\n    color: var(--t2-blue);\n    background: #e8f2ff;\n    border: 1px solid #d5e8fb;\n    font-size: 13px;\n    font-weight: 700;\n    letter-spacing: .04em;\n    text-transform: uppercase;\n    padding: 7px 12px;\n    border-radius: 999px;\n    margin-bottom: 16px;\n  }\n\n  .t2spd-lead {\n    font-size: 19px;\n    line-height: 1.75;\n    max-width: 900px;\n    color: #263445;\n    margin: 0 0 18px;\n  }\n\n  .t2spd-direct {\n    background: #ffffff;\n    border-left: 5px solid var(--t2-blue);\n    border-radius: 16px;\n    padding: 18px 20px;\n    margin-top: 20px;\n    box-shadow: 0 12px 30px rgba(0, 72, 152, .08);\n  }\n\n  .t2spd-direct strong {\n    color: var(--t2-blue);\n  }\n\n  .t2spd-cta-row {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 12px;\n    margin-top: 22px;\n  }\n\n  .t2spd-btn {\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    min-height: 44px;\n    padding: 11px 18px;\n    border-radius: 999px;\n    font-weight: 700;\n    border: 1px solid var(--t2-blue);\n    transition: all .2s ease;\n    line-height: 1.3;\n    text-align: center;\n  }\n\n  .t2spd-btn-primary {\n    background: var(--t2-blue);\n    color: #ffffff !important;\n  }\n\n  .t2spd-btn-primary:hover {\n    background: var(--t2-blue-dark);\n    text-decoration: none !important;\n    transform: translateY(-1px);\n  }\n\n  .t2spd-btn-ghost {\n    background: #ffffff;\n    color: var(--t2-blue) !important;\n  }\n\n  .t2spd-btn-ghost:hover {\n    background: #f0f7ff;\n    text-decoration: none !important;\n  }\n\n  \/* \u7edf\u4e00\u4fee\u590d\u6240\u6709 popup \u4e3b\u6309\u94ae\u770b\u4e0d\u89c1\u6587\u5b57\u7684\u95ee\u9898 *\/\n  .t2spd-btn-primary.leeyee-site-popup-btn {\n    background: #ffffff !important;\n    color: #004898 !important;\n    border: 2px solid #004898 !important;\n    font-weight: 800 !important;\n  }\n\n  .t2spd-btn-primary.leeyee-site-popup-btn:hover {\n    background: #f0f7ff !important;\n    color: #00366f !important;\n    text-decoration: none !important;\n    transform: translateY(-1px);\n  }\n\n  .t2spd-section {\n    margin: 46px 0;\n  }\n\n  .t2spd-section h2 {\n    font-size: 30px;\n    line-height: 1.25;\n    margin: 0 0 16px;\n    color: #122033;\n  }\n\n  .t2spd-section h3 {\n    font-size: 21px;\n    line-height: 1.35;\n    margin: 26px 0 10px;\n    color: #162235;\n  }\n\n  .t2spd-section p {\n    margin: 0 0 14px;\n  }\n\n  .t2spd-note {\n    background: #fff7ed;\n    border: 1px solid #fed7aa;\n    border-left: 5px solid var(--t2-red);\n    border-radius: 16px;\n    padding: 16px 18px;\n    margin: 18px 0;\n  }\n\n  .t2spd-note strong {\n    color: var(--t2-red);\n  }\n\n  .t2spd-grid {\n    display: grid;\n    grid-template-columns: repeat(3, minmax(0, 1fr));\n    gap: 16px;\n    margin: 22px 0;\n  }\n\n  .t2spd-card {\n    background: #ffffff;\n    border: 1px solid var(--t2-border);\n    border-radius: 18px;\n    padding: 20px;\n    box-shadow: 0 10px 24px rgba(15, 23, 42, .05);\n  }\n\n  .t2spd-card h3 {\n    margin-top: 0;\n    color: var(--t2-blue);\n    font-size: 20px;\n  }\n\n  .t2spd-card p:last-child {\n    margin-bottom: 0;\n  }\n\n  .t2spd-card ul {\n    margin: 10px 0 0 18px;\n    padding: 0;\n  }\n\n  .t2spd-card li {\n    margin-bottom: 8px;\n  }\n\n  .t2spd-table-wrap {\n    overflow-x: auto;\n    border: 1px solid var(--t2-border);\n    border-radius: 18px;\n    margin: 22px 0;\n    background: #ffffff;\n  }\n\n  .t2spd-table {\n    width: 100%;\n    border-collapse: collapse;\n    min-width: 720px;\n  }\n\n  .t2spd-table th {\n    background: var(--t2-blue);\n    color: #ffffff;\n    text-align: left;\n    font-weight: 700;\n    padding: 14px 16px;\n    white-space: nowrap;\n  }\n\n  .t2spd-table td {\n    border-top: 1px solid var(--t2-border);\n    padding: 14px 16px;\n    vertical-align: top;\n  }\n\n  .t2spd-table tr:nth-child(even) td {\n    background: #f8fbff;\n  }\n\n  .t2spd-pill {\n    display: inline-flex;\n    align-items: center;\n    padding: 4px 9px;\n    border-radius: 999px;\n    background: #e9f4ff;\n    color: var(--t2-blue);\n    font-size: 13px;\n    font-weight: 700;\n  }\n\n  .t2spd-split {\n    display: grid;\n    grid-template-columns: 1fr 1fr;\n    gap: 18px;\n    margin: 22px 0;\n  }\n\n  .t2spd-good {\n    border-left: 5px solid var(--t2-green);\n  }\n\n  .t2spd-bad {\n    border-left: 5px solid var(--t2-red);\n  }\n\n  .t2spd-product-grid {\n    display: grid;\n    grid-template-columns: repeat(2, minmax(0, 1fr));\n    gap: 18px;\n    margin: 22px 0;\n  }\n\n  .t2spd-product {\n    background: #ffffff;\n    border: 1px solid var(--t2-border);\n    border-radius: 20px;\n    padding: 22px;\n    box-shadow: 0 12px 26px rgba(15, 23, 42, .06);\n  }\n\n  .t2spd-product .tag {\n    display: inline-block;\n    margin-bottom: 10px;\n    padding: 5px 10px;\n    border-radius: 999px;\n    background: #edf6ff;\n    color: var(--t2-blue);\n    font-size: 13px;\n    font-weight: 700;\n  }\n\n  .t2spd-product h3 {\n    margin: 0 0 10px;\n    color: #122033;\n  }\n\n  .t2spd-product-meta {\n    display: grid;\n    grid-template-columns: 1fr 1fr;\n    gap: 8px;\n    margin: 14px 0 18px;\n    font-size: 14px;\n    color: var(--t2-muted);\n  }\n\n  .t2spd-product-meta span {\n    background: #f6f9fc;\n    border: 1px solid #e6eef6;\n    border-radius: 10px;\n    padding: 8px 10px;\n  }\n\n  .t2spd-faq {\n    border-top: 1px solid var(--t2-border);\n  }\n\n  .t2spd-faq-item {\n    border-bottom: 1px solid var(--t2-border);\n    padding: 20px 0;\n  }\n\n  .t2spd-faq-item h3 {\n    margin: 0 0 8px;\n    color: #122033;\n  }\n\n  .t2spd-related {\n    background: var(--t2-light);\n    border: 1px solid var(--t2-border);\n    border-radius: 22px;\n    padding: 24px;\n  }\n\n  .t2spd-related ul {\n    margin: 10px 0 0 20px;\n  }\n\n  .t2spd-final-cta {\n    background: linear-gradient(135deg, var(--t2-blue) 0%, #0b63bd 100%);\n    color: #ffffff;\n    border-radius: 24px;\n    padding: 30px;\n    margin: 48px 0 24px;\n  }\n\n  .t2spd-final-cta h2,\n  .t2spd-final-cta p {\n    color: #ffffff;\n  }\n\n  .t2spd-final-cta .t2spd-btn {\n    border-color: #ffffff;\n  }\n\n  .t2spd-final-cta .t2spd-btn-primary.leeyee-site-popup-btn {\n    background: #ffffff !important;\n    color: #004898 !important;\n    border: 2px solid #ffffff !important;\n    font-weight: 800 !important;\n  }\n\n  .t2spd-final-cta .t2spd-btn-primary.leeyee-site-popup-btn:hover {\n    background: #f0f7ff !important;\n    color: #00366f !important;\n    text-decoration: none !important;\n    transform: translateY(-1px);\n  }\n\n  .t2spd-final-cta .t2spd-btn-ghost {\n    background: transparent;\n    color: #ffffff !important;\n    border: 2px solid #ffffff !important;\n  }\n\n  .t2spd-final-cta .t2spd-btn-ghost:hover {\n    background: rgba(255, 255, 255, .12);\n    color: #ffffff !important;\n    text-decoration: none !important;\n  }\n\n  @media (max-width: 900px) {\n    .t2spd-grid,\n    .t2spd-split,\n    .t2spd-product-grid {\n      grid-template-columns: 1fr;\n    }\n\n    .t2spd-hero {\n      padding: 24px;\n    }\n\n    .t2spd-section h2 {\n      font-size: 25px;\n    }\n\n    .t2spd-lead {\n      font-size: 17px;\n    }\n\n    .t2spd-table {\n      min-width: 680px;\n    }\n  }\n<\/style>\n\n<div class=\"t2spd-page\">\n\n  <section class=\"t2spd-hero\">\n    <div class=\"t2spd-kicker\">Type 2 SPD Guide<\/div>\n\n    <p class=\"t2spd-lead\">\n      A Type 2 SPD is a distribution-level surge protective device used to limit transient overvoltages in low-voltage electrical systems. It is commonly installed in main distribution boards, sub-distribution boards, control panels, and secondary protection points.\n    <\/p>\n\n    <div class=\"t2spd-direct\">\n      <strong>Direct answer:<\/strong> Use a Type 2 SPD when you need secondary surge protection against induced lightning surges, switching surges, and residual surge energy inside an AC distribution system or an electrical control panel.\n    <\/div>\n\n    <div class=\"t2spd-cta-row\">\n      <a class=\"t2spd-btn t2spd-btn-primary leeyee-site-popup-btn\" href=\"javascript:void(0);\">Ask for Type 2 SPD Selection<\/a>\n      <a class=\"t2spd-btn t2spd-btn-ghost\" href=\"https:\/\/www.cnspd.com\/spd-type1-vs-type2-vs-type-3\/\">Compare SPD Types<\/a>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\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\/de\/typ-2-spd\/#what-is-a-type-2-spd\" >What Is a Type 2 SPD?<\/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\/de\/typ-2-spd\/#where-is-a-type-2-spd-installed\" >Where Is a Type 2 SPD Installed?<\/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\/de\/typ-2-spd\/#when-should-you-choose-a-type-2-spd\" >When Should You Choose a Type 2 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\/de\/typ-2-spd\/#how-to-select-a-type-2-spd\" >How to Select a Type 2 SPD<\/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\/de\/typ-2-spd\/#type-2-spd-ratings-explained\" >Type 2 SPD Ratings Explained<\/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\/de\/typ-2-spd\/#type-2-spd-for-ac-distribution-boards\" >Type 2 SPD for AC Distribution Boards<\/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\/de\/typ-2-spd\/#recommended-leeyee-type-2-spd-options\" >Recommended LEEYEE Type 2 SPD Options<\/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\/de\/typ-2-spd\/#installation-notes-for-type-2-spd\" >Installation Notes for Type 2 SPD<\/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\/de\/typ-2-spd\/#common-mistakes-when-choosing-type-2-spd\" >Common Mistakes When Choosing Type 2 SPD<\/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\/de\/typ-2-spd\/#type-2-spd-faq\" >Type 2 SPD FAQ<\/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\/de\/typ-2-spd\/#related-guides\" >Related Guides<\/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\/de\/typ-2-spd\/#need-help-selecting-a-type-2-spd\" >Need Help Selecting a Type 2 SPD?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-is-a-type-2-spd\"><\/span>What Is a Type 2 SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p>\n      A Type 2 SPD is a surge protective device tested with an 8\/20 \u03bcs discharge current waveform. In IEC terminology, it is commonly associated with Class II surge protection. Its main role is to reduce transient overvoltages to a safer level before they reach downstream circuits and equipment.\n    <\/p>\n\n    <p>\n      Type 2 SPDs are widely used because most buildings, industrial panels, machinery systems, and commercial electrical installations need protection against switching surges and indirect lightning effects at the distribution level.\n    <\/p>\n\n    <div class=\"t2spd-note\">\n      <strong>Important:<\/strong> This page focuses only on Type 2 SPDs. For a complete comparison of Type 1, Type 2 and Type 3 SPDs, read the dedicated guide:\n      <a href=\"https:\/\/www.cnspd.com\/spd-type1-vs-type2-vs-type-3\/\">Type 1 vs Type 2 vs Type 3 SPD<\/a>.\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"where-is-a-type-2-spd-installed\"><\/span>Where Is a Type 2 SPD Installed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p>\n      A Type 2 SPD is normally installed at the distribution level of the electrical system. The exact position depends on the system design, the upstream protection stage, cable length, grounding quality, and local installation rules.\n    <\/p>\n\n    <div class=\"t2spd-table-wrap\">\n      <table class=\"t2spd-table\">\n        <thead>\n          <tr>\n            <th>Installation point<\/th>\n            <th>Typical use<\/th>\n            <th>Why Type 2 SPD is used<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Main distribution board<\/td>\n            <td>Commercial buildings, workshops, factories<\/td>\n            <td>Limits surges entering or circulating through the main low-voltage distribution system.<\/td>\n          <\/tr>\n          <tr>\n            <td>Sub-distribution board<\/td>\n            <td>Branch circuits, floors, machine zones<\/td>\n            <td>Reduces residual surge voltage before it reaches downstream loads.<\/td>\n          <\/tr>\n          <tr>\n            <td>Industrial control panel<\/td>\n            <td>PLC cabinets, motor control panels, automation systems<\/td>\n            <td>Protects sensitive control components from switching and induced surges.<\/td>\n          <\/tr>\n          <tr>\n            <td>OEM electrical assembly<\/td>\n            <td>Distribution boxes, machinery panels, power cabinets<\/td>\n            <td>Adds integrated surge protection inside finished electrical equipment.<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"when-should-you-choose-a-type-2-spd\"><\/span>When Should You Choose a Type 2 SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <div class=\"t2spd-grid\">\n      <div class=\"t2spd-card\">\n        <h3>Distribution protection<\/h3>\n        <p>\n          Choose Type 2 SPD for distribution boards and sub-panels where downstream circuits need protection from transient overvoltages.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>Switching surge protection<\/h3>\n        <p>\n          Type 2 SPD is suitable for reducing surges caused by motors, transformers, HVAC equipment, contactors, and grid switching events.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>Secondary protection<\/h3>\n        <p>\n          When a Type 1 or Type 1+2 SPD is installed upstream, Type 2 SPD can provide additional downstream protection.\n        <\/p>\n      <\/div>\n    <\/div>\n\n    <div class=\"t2spd-split\">\n      <div class=\"t2spd-card t2spd-good\">\n        <h3>Good use cases<\/h3>\n        <ul>\n          <li>AC distribution boards<\/li>\n          <li>Industrial control panels<\/li>\n          <li>Commercial electrical cabinets<\/li>\n          <li>Machinery power panels<\/li>\n          <li>OEM low-voltage assemblies<\/li>\n        <\/ul>\n      <\/div>\n\n      <div class=\"t2spd-card t2spd-bad\">\n        <h3>Not enough by itself when<\/h3>\n        <ul>\n          <li>The building has external lightning protection<\/li>\n          <li>Partial lightning current may enter the installation<\/li>\n          <li>The project requires Type 1 impulse current discharge<\/li>\n          <li>The installation is exposed to severe lightning risk<\/li>\n          <li>Local rules require Type 1 or Type 1+2 upstream protection<\/li>\n        <\/ul>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"how-to-select-a-type-2-spd\"><\/span>How to Select a Type 2 SPD<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p>\n      Type 2 SPD selection should be based on system voltage, protection mode, discharge current rating, voltage protection level, short-circuit withstand capability, installation position, and maintenance requirements.\n    <\/p>\n\n    <div class=\"t2spd-table-wrap\">\n      <table class=\"t2spd-table\">\n        <thead>\n          <tr>\n            <th>Selection factor<\/th>\n            <th>What to check<\/th>\n            <th>Why it matters<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td><span class=\"t2spd-pill\">System voltage<\/span><\/td>\n            <td>Nominal voltage and maximum continuous operating voltage, Uc<\/td>\n            <td>The SPD must remain stable during normal operation and TOV conditions.<\/td>\n          <\/tr>\n          <tr>\n            <td><span class=\"t2spd-pill\">Protection mode<\/span><\/td>\n            <td>L-N, L-PE, N-PE, 1P, 2P, 3P, 3P+N, 4P<\/td>\n            <td>The protection mode must match the earthing system and panel wiring.<\/td>\n          <\/tr>\n          <tr>\n            <td><span class=\"t2spd-pill\">Discharge current<\/span><\/td>\n            <td>In and Imax based on 8\/20 \u03bcs waveform<\/td>\n            <td>These ratings show the surge current duty the Type 2 SPD can handle.<\/td>\n          <\/tr>\n          <tr>\n            <td><span class=\"t2spd-pill\">Voltage protection level<\/span><\/td>\n            <td>Up value<\/td>\n            <td>Lower Up helps reduce residual overvoltage reaching downstream equipment.<\/td>\n          <\/tr>\n          <tr>\n            <td><span class=\"t2spd-pill\">Short-circuit rating<\/span><\/td>\n            <td>SCCR \/ ISCCR and backup protection requirement<\/td>\n            <td>The SPD must coordinate safely with the electrical system and protective device.<\/td>\n          <\/tr>\n          <tr>\n            <td><span class=\"t2spd-pill\">Maintenance<\/span><\/td>\n            <td>Pluggable module, visual indicator, remote signaling contact<\/td>\n            <td>These features make inspection and replacement easier in panels and OEM assemblies.<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"type-2-spd-ratings-explained\"><\/span>Type 2 SPD Ratings Explained<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p>\n      A Type 2 SPD should not be selected only by its maximum current number. Buyers should check the full group of ratings because each parameter describes a different part of the protection performance.\n    <\/p>\n\n    <div class=\"t2spd-grid\">\n      <div class=\"t2spd-card\">\n        <h3>Uc<\/h3>\n        <p>\n          Maximum continuous operating voltage. It must be suitable for the system voltage and expected voltage tolerance.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>In<\/h3>\n        <p>\n          Nominal discharge current under the 8\/20 \u03bcs waveform. It represents repeated discharge performance under defined test conditions.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>Imax<\/h3>\n        <p>\n          Maximum discharge current under the 8\/20 \u03bcs waveform. It indicates the peak discharge capacity for Type 2 duty.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>Up<\/h3>\n        <p>\n          Voltage protection level. It shows the residual voltage level after the SPD operates under test conditions.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>TOV<\/h3>\n        <p>\n          Temporary overvoltage withstand behavior. This is important for system safety and end-of-life performance.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>Backup protection<\/h3>\n        <p>\n          Some installations require a fuse or breaker coordinated with the SPD according to manufacturer instructions.\n        <\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"type-2-spd-for-ac-distribution-boards\"><\/span>Type 2 SPD for AC Distribution Boards<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p>\n      In AC distribution boards, Type 2 SPDs are usually installed in parallel with the power supply. They should be connected with short, straight conductors and a reliable grounding path to reduce residual voltage and improve protection performance.\n    <\/p>\n\n    <div class=\"t2spd-table-wrap\">\n      <table class=\"t2spd-table\">\n        <thead>\n          <tr>\n            <th>AC system<\/th>\n            <th>Common SPD configuration<\/th>\n            <th>Typical application<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr>\n            <td>Single-phase AC<\/td>\n            <td>1P+N or 2P Type 2 SPD<\/td>\n            <td>Residential boards, small commercial panels, single-phase equipment<\/td>\n          <\/tr>\n          <tr>\n            <td>Three-phase AC<\/td>\n            <td>3P or 3P+N Type 2 SPD<\/td>\n            <td>Factories, machinery panels, power distribution cabinets<\/td>\n          <\/tr>\n          <tr>\n            <td>TT \/ TN systems<\/td>\n            <td>Configuration depends on earthing system<\/td>\n            <td>Electrical boards where correct N-PE or L-PE protection mode is required<\/td>\n          <\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <p>\n      For DC solar systems, use DC-rated Type 2 SPDs selected according to PV string voltage and IEC 61643-31 requirements. Do not use an AC-only SPD on the DC side of a PV system.\n    <\/p>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"recommended-leeyee-type-2-spd-options\"><\/span>Recommended LEEYEE Type 2 SPD Options<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p>\n      LEEYEE provides DIN rail Type 2 SPDs for distribution boards, control panels, and OEM electrical assemblies. The exact model should be selected according to system voltage, poles, protection mode, discharge current, and certification requirements.\n    <\/p>\n\n    <div class=\"t2spd-product-grid\">\n      <div class=\"t2spd-product\">\n        <span class=\"tag\">AC Type 2 SPD<\/span>\n        <h3>LY1-C40\/3(S)+1 Pluggable Multi-Pole SPD<\/h3>\n        <p>\n          A 3P+N Type 2 AC SPD for three-phase distribution boards and industrial panels.\n        <\/p>\n        <div class=\"t2spd-product-meta\">\n          <span>Type 2 \/ Class II<\/span>\n          <span>In 20 kA<\/span>\n          <span>Imax 40 kA<\/span>\n          <span>DIN rail<\/span>\n        <\/div>\n        <a class=\"t2spd-btn t2spd-btn-ghost\" href=\"https:\/\/www.cnspd.com\/ly1-c403s1pluggable-multi-pole-spd-product\/\" target=\"_blank\" rel=\"noopener\">View Product<\/a>\n      <\/div>\n\n      <div class=\"t2spd-product\">\n        <span class=\"tag\">Product family<\/span>\n        <h3>Type 2 DIN Rail SPD Series<\/h3>\n        <p>\n          Pluggable Type 2 surge protective devices for AC distribution boards, control cabinets, and OEM panel builders.\n        <\/p>\n        <div class=\"t2spd-product-meta\">\n          <span>1P \/ 2P \/ 3P \/ 4P<\/span>\n          <span>AC systems<\/span>\n          <span>Remote signal option<\/span>\n          <span>OEM support<\/span>\n        <\/div>\n        <a class=\"t2spd-btn t2spd-btn-primary leeyee-site-popup-btn\" href=\"javascript:void(0);\">Request Model Match<\/a>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"installation-notes-for-type-2-spd\"><\/span>Installation Notes for Type 2 SPD<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p>\n      Correct installation is as important as correct model selection. A suitable Type 2 SPD can perform poorly if the connection length is too long, the grounding path is weak, or the backup protection is not coordinated.\n    <\/p>\n\n    <div class=\"t2spd-grid\">\n      <div class=\"t2spd-card\">\n        <h3>Keep leads short<\/h3>\n        <p>\n          Long conductors increase residual voltage. Keep SPD wiring as short and straight as possible.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>Check grounding<\/h3>\n        <p>\n          The SPD needs a low-impedance path to earth or equipotential bonding for effective surge diversion.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card\">\n        <h3>Use correct backup protection<\/h3>\n        <p>\n          Follow the manufacturer\u2019s fuse or breaker coordination requirement for the selected SPD model.\n        <\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"common-mistakes-when-choosing-type-2-spd\"><\/span>Common Mistakes When Choosing Type 2 SPD<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <div class=\"t2spd-split\">\n      <div class=\"t2spd-card t2spd-bad\">\n        <h3>Mistake 1: Choosing only by Imax<\/h3>\n        <p>\n          Imax is important, but it is not the only rating. Uc, Up, In, TOV behavior, poles, and backup protection must also be checked.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card t2spd-bad\">\n        <h3>Mistake 2: Using AC SPD on DC circuits<\/h3>\n        <p>\n          AC and DC SPDs are not interchangeable. DC systems, especially PV systems, need DC-rated SPDs.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card t2spd-bad\">\n        <h3>Mistake 3: Ignoring upstream lightning risk<\/h3>\n        <p>\n          If lightning current may enter the system, Type 2 alone may not be enough. A Type 1 or Type 1+2 SPD may be required upstream.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-card t2spd-bad\">\n        <h3>Mistake 4: Poor wiring layout<\/h3>\n        <p>\n          Excessive cable length and poor grounding can reduce the real protection level even when the SPD rating looks correct.\n        <\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <h2><span class=\"ez-toc-section\" id=\"type-2-spd-faq\"><\/span>Type 2 SPD FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <div class=\"t2spd-faq\">\n      <div class=\"t2spd-faq-item\">\n        <h3>What is a Type 2 SPD used for?<\/h3>\n        <p>\n          A Type 2 SPD is used for secondary surge protection in distribution boards, sub-distribution boards, control panels, and low-voltage electrical systems. It limits induced lightning surges, switching surges, and residual surge energy.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-faq-item\">\n        <h3>Is Type 2 SPD the same as Class II SPD?<\/h3>\n        <p>\n          In IEC-based terminology, Type 2 SPD is commonly associated with Class II testing and the 8\/20 \u03bcs discharge current waveform.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-faq-item\">\n        <h3>Can Type 2 SPD be installed without Type 1 SPD?<\/h3>\n        <p>\n          In many ordinary distribution systems, Type 2 SPD can be used as the main distribution-level SPD. However, if the installation has external lightning protection or significant lightning-current exposure, Type 1 or Type 1+2 protection may be required upstream.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-faq-item\">\n        <h3>Where should a Type 2 SPD be installed?<\/h3>\n        <p>\n          It is commonly installed in main or sub-distribution boards, close to the circuits being protected. The wiring should be short and properly grounded.\n        <\/p>\n      <\/div>\n\n      <div class=\"t2spd-faq-item\">\n        <h3>How do I choose the right Type 2 SPD?<\/h3>\n        <p>\n          Check the system voltage, Uc, In, Imax, Up, pole configuration, protection mode, earthing system, short-circuit rating, backup protection, and whether a pluggable or remote-signal design is needed.\n        <\/p>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-section\">\n    <div class=\"t2spd-related\">\n      <h2><span class=\"ez-toc-section\" id=\"related-guides\"><\/span>Related Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\n      <p>\n        These pages are separated intentionally, so each search intent has one clear answer page.\n      <\/p>\n      <ul>\n        <li><a href=\"https:\/\/www.cnspd.com\/spd-type1-vs-type2-vs-type-3\/\">Type 1 vs Type 2 vs Type 3 SPD<\/a> \u2014 use this page for complete SPD type comparison.<\/li>\n        <li><a href=\"https:\/\/www.cnspd.com\/type-1-2-spd\/\">Type 1+2 SPD<\/a> \u2014 use this page for combined Type 1+2 surge protection.<\/li>\n        <li><a href=\"https:\/\/www.cnspd.com\/ac-surge-protective-device\/\">AC Surge Protective Device<\/a> \u2014 use this page for AC SPD basics and AC system protection.<\/li>\n        <li><a href=\"https:\/\/www.cnspd.com\/dc-surge-protective-device\/\">DC Surge Protective Device<\/a> \u2014 use this page for DC SPD basics and DC system protection.<\/li>\n      <\/ul>\n    <\/div>\n  <\/section>\n\n  <section class=\"t2spd-final-cta\">\n    <h2><span class=\"ez-toc-section\" id=\"need-help-selecting-a-type-2-spd\"><\/span>Need Help Selecting a Type 2 SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n    <p>\n      Send us your system voltage, pole configuration, installation position, and application. LEEYEE can help match a Type 2 SPD for distribution boards, control panels, and OEM electrical assemblies.\n    <\/p>\n    <div class=\"t2spd-cta-row\">\n      <a class=\"t2spd-btn t2spd-btn-primary leeyee-site-popup-btn\" href=\"javascript:void(0);\">Get Type 2 SPD Recommendation<\/a>\n      <a class=\"t2spd-btn t2spd-btn-ghost\" href=\"https:\/\/www.cnspd.com\/ly1-c403s1pluggable-multi-pole-spd-product\/\" target=\"_blank\" rel=\"noopener\">View Type 2 SPD Product<\/a>\n    <\/div>\n  <\/section>\n\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a Type 2 SPD used for?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A Type 2 SPD is used for secondary surge protection in distribution boards, sub-distribution boards, control panels, and low-voltage electrical systems. 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The wiring should be short and properly grounded.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right Type 2 SPD?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Check the system voltage, Uc, In, Imax, Up, pole configuration, protection mode, earthing system, short-circuit rating, backup protection, and whether a pluggable or remote-signal design is needed.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n<script>\n  document.addEventListener('DOMContentLoaded', function () {\n    document.querySelectorAll('.leeyee-site-popup-btn').forEach(function (btn) {\n      btn.addEventListener('click', function (e) {\n        e.preventDefault();\n\n        var trigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\n\n        if (trigger) {\n          trigger.click();\n        } else {\n          window.open('https:\/\/www.cnspd.com\/contact\/', '_blank', 'noopener');\n        }\n      });\n    });\n  });\n<\/script><\/div><section class=\"l-section wpb_row height_large\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row via_grid cols_custom laptops-cols_inherit tablets-cols_inherit mobiles-cols_1 valign_top type_default stacking_default\"><\/div><\/div><\/section><\/div><\/div><\/section><div class=\"wpb_column vc_column_container\"><div class=\"vc_column-inner\"><\/div><\/div><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><\/div><\/div>\n<p><!-- notionvc: d7eeeba0-98d7-4624-bbfa-ab71950ef390 --><\/p>\n<p><script type=\"application\/ld+json\"><br \/>\n{<br \/>\n  \"@context\": \"https:\/\/schema.org\",<br \/>\n  \"@type\": \"FAQPage\",<br \/>\n  \"mainEntity\": [<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"What is a Type 2 SPD used for?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"Type 2 SPDs are installed at the distribution panel to protect branch circuits and connected devices from internal and external surges.\"<br \/>\n      }<br \/>\n    },<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"What\u2019s the difference between Type 1 and Type 2 SPD?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"Type 1 SPDs are installed at the service entrance to protect against lightning and large surges. Type 2 SPDs are installed at the distribution board for additional protection against residual surges.\"<br \/>\n      }<br \/>\n    },<br \/>\n    {<br \/>\n      \"@type\": \"Question\",<br \/>\n      \"name\": \"Do I need both Type 1 and Type 2 SPD?\",<br \/>\n      \"acceptedAnswer\": {<br \/>\n        \"@type\": \"Answer\",<br \/>\n        \"text\": \"Yes. Type 1 provides the first defense against external surges, while Type 2 adds secondary protection for sensitive equipment. Using both ensures comprehensive safety.\"<br \/>\n      }<br \/>\n    }<br \/>\n  ]\n}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>{ &#8220;@context&#8221;: &#8220;https:\/\/schema.org&#8221;, &#8220;@type&#8221;: &#8220;FAQPage&#8221;, &#8220;mainEntity&#8221;: [ { &#8220;@type&#8221;: &#8220;Question&#8221;, &#8220;name&#8221;: &#8220;What is a Type 2 SPD used for?&#8221;, &#8220;acceptedAnswer&#8221;: { &#8220;@type&#8221;: &#8220;Answer&#8221;, &#8220;text&#8221;: &#8220;Type 2 SPDs are installed at the distribution panel to protect branch circuits and connected devices from internal and external surges.&#8221; } }, { &#8220;@type&#8221;: &#8220;Question&#8221;, &#8220;name&#8221;: &#8220;What\u2019s the difference between&#8230;<\/p>","protected":false},"author":18,"featured_media":26085,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-25807","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Type 2 SPD: Complete Guide (2025) | LEEYEE Electrics<\/title>\n<meta name=\"description\" content=\"Discover how Type 2 SPD protects your devices from surges. 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