{"id":29791,"date":"2026-07-03T14:29:05","date_gmt":"2026-07-03T06:29:05","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=29791"},"modified":"2026-07-03T14:29:15","modified_gmt":"2026-07-03T06:29:15","slug":"iec-61643-11-vs-iec-61643-31-spd-standard-guide-for-ac-and-pv-buyers","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/iec-61643-11-vs-iec-61643-31\/","title":{"rendered":"IEC 61643-11 vs IEC 61643-31: SPD-Standardleitfaden f\u00fcr AC- und PV-K\u00e4ufer"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"29791\" class=\"elementor elementor-29791\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d99a921 e-flex e-con-boxed e-con e-parent\" data-id=\"d99a921\" 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-17ea5b8 elementor-widget elementor-widget-html\" data-id=\"17ea5b8\" 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grid-template-columns: 1fr;\r\n    }\r\n\r\n    .leeyee-arrow {\r\n      transform: rotate(90deg);\r\n      font-size: 22px;\r\n      line-height: 1;\r\n      margin: 2px 0;\r\n    }\r\n\r\n    .leeyee-table-wrap {\r\n      border-radius: 12px;\r\n      margin-bottom: 24px;\r\n    }\r\n\r\n    .leeyee-std-table {\r\n      min-width: 720px;\r\n    }\r\n\r\n    .leeyee-std-table th,\r\n    .leeyee-std-table td {\r\n      padding: 12px 13px;\r\n      font-size: 14.5px;\r\n    }\r\n\r\n    .leeyee-related,\r\n    .leeyee-final-cta {\r\n      padding: 20px 18px;\r\n      border-radius: 16px;\r\n    }\r\n\r\n    .leeyee-final-actions {\r\n      flex-direction: column;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<div class=\"leeyee-std-article\">\r\n  <section class=\"leeyee-std-intro\">\r\n    <div class=\"leeyee-std-kicker\">SPD Standard Guide for Buyers<\/div>\r\n    <p class=\"leeyee-std-lead\">\r\n      Buying an AC SPD? Check <strong>IEC 61643-11<\/strong>. Buying a PV\/DC SPD for the solar DC side? Check <strong>IEC 61643-31<\/strong>.\r\n    <\/p>\r\n    <p>\r\n      This guide explains the difference between IEC 61643-11 and IEC 61643-31 in a practical way. It is written for solar EPCs, panel builders, distributors, electrical contractors, and OEM buyers who need to check whether an SPD certificate really matches the project.\r\n    <\/p>\r\n    <p class=\"leeyee-std-muted\">\r\n      The key is not only the standard number. Buyers should also check the certificate scope, model number, voltage rating, SPD Type, In, Imax, Iimp, pole configuration, and AC or PV\/DC application.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section class=\"leeyee-quick\">\r\n    <div class=\"leeyee-quick-title\">Quick answer: IEC 61643-11 vs IEC 61643-31<\/div>\r\n    <p>\r\n      <strong>IEC 61643-11<\/strong> applies to surge protective devices connected to AC low-voltage power systems. For buyers, this is the standard normally checked for AC SPD used in distribution boards, AC panels, industrial cabinets, and building power systems.\r\n    <\/p>\r\n    <p>\r\n      <strong>IEC 61643-31<\/strong> applies to SPDs installed on the DC side of photovoltaic systems. For buyers, this is the standard normally checked for PV\/DC SPD used in solar strings, combiner boxes, and inverter DC input protection.\r\n    <\/p>\r\n\r\n    <div class=\"leeyee-quick-rule\">\r\n      <div class=\"leeyee-rule-card\">\r\n        <strong>AC SPD \u2192 IEC 61643-11<\/strong>\r\n        <span>For low-voltage AC power systems, distribution boards, main panels, and industrial AC cabinets.<\/span>\r\n      <\/div>\r\n      <div class=\"leeyee-rule-card\">\r\n        <strong>PV\/DC SPD \u2192 IEC 61643-31<\/strong>\r\n        <span>For the DC side of photovoltaic systems, such as PV strings, combiner boxes, and inverter DC inputs.<\/span>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"leeyee-article-figure\">\r\n    <img src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/iec-61643-11-vs-iec-61643-31-spd-standard-comparison.webp\" alt=\"IEC 61643-11 vs IEC 61643-31 standard comparison for AC SPD and PV DC SPD\" loading=\"lazy\" decoding=\"async\">\r\n    <figcaption>IEC 61643-11 is used for AC SPD, while IEC 61643-31 is used for PV\/DC SPD on the photovoltaic DC side.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-mini-cta\">\r\n    <p>\r\n      Not sure whether your project needs AC SPD or PV\/DC SPD? Send us your system voltage and installation position.\r\n    <\/p>\r\n    <a class=\"leeyee-btn leeyee-site-popup-btn\" href=\"javascript:void(0);\"><span>Ask for SPD Standard Help<\/span><\/a>\r\n  <\/div>\r\n\r\n  <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/iec-61643-11-vs-iec-61643-31\/#iec-61643-11-vs-iec-61643-31-comparison-table\" >IEC 61643-11 vs IEC 61643-31 comparison table<\/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\/iec-61643-11-vs-iec-61643-31\/#when-should-buyers-check-iec-61643-11\" >When should buyers check IEC 61643-11?<\/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\/iec-61643-11-vs-iec-61643-31\/#when-should-buyers-check-iec-61643-31\" >When should buyers check IEC 61643-31?<\/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\/iec-61643-11-vs-iec-61643-31\/#product-standard-vs-selection-and-application-standard\" >Product standard vs selection and application standard<\/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\/iec-61643-11-vs-iec-61643-31\/#how-to-check-an-spd-certificate-before-buying\" >How to check an SPD certificate before buying<\/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\/iec-61643-11-vs-iec-61643-31\/#simple-decision-flow-for-spd-standard-selection\" >Simple decision flow for SPD standard selection<\/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\/iec-61643-11-vs-iec-61643-31\/#common-mistakes-when-comparing-iec-61643-11-and-iec-61643-31\" >Common mistakes when comparing IEC 61643-11 and IEC 61643-31<\/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\/iec-61643-11-vs-iec-61643-31\/#what-information-should-buyers-send-before-ordering\" >What information should buyers send before ordering?<\/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\/iec-61643-11-vs-iec-61643-31\/#related-reading-for-spd-buyers\" >Related reading for SPD buyers<\/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\/iec-61643-11-vs-iec-61643-31\/#faq-iec-61643-11-vs-iec-61643-31\" >FAQ: IEC 61643-11 vs IEC 61643-31<\/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\/iec-61643-11-vs-iec-61643-31\/#need-help-checking-the-correct-spd-standard\" >Need help checking the correct SPD standard?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"iec-61643-11-vs-iec-61643-31-comparison-table\"><\/span>IEC 61643-11 vs IEC 61643-31 comparison table<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>\r\n    The fastest way to understand the difference is to look at the application. IEC 61643-11 is for AC low-voltage power systems. IEC 61643-31 is for photovoltaic DC-side surge protection.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-std-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Buyer question<\/th>\r\n          <th>IEC 61643-11<\/th>\r\n          <th>IEC 61643-31<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Main application<\/td>\r\n          <td>AC low-voltage power systems.<\/td>\r\n          <td>Photovoltaic installations on the DC side.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Typical SPD<\/td>\r\n          <td>AC SPD for distribution boards, AC panels, and power cabinets.<\/td>\r\n          <td>PV\/DC SPD for solar strings, combiner boxes, and inverter DC inputs.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Typical voltage range<\/td>\r\n          <td>AC systems up to 1000 V RMS, depending on the standard scope and product rating.<\/td>\r\n          <td>PV DC systems up to 1500 V DC, depending on the standard scope and product rating.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Common buyer<\/td>\r\n          <td>Panel builders, electrical contractors, distributors, OEM cabinet manufacturers.<\/td>\r\n          <td>Solar EPCs, PV combiner box manufacturers, inverter cabinet builders, solar distributors.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Key rating to check<\/td>\r\n          <td>Uc, Type, In, Imax, Iimp, Up, pole configuration, AC system type.<\/td>\r\n          <td>Ucpv, Type, In, Imax, Iimp, Up, pole configuration, PV DC-side application.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Certificate meaning<\/td>\r\n          <td>The certificate should match the AC SPD model and AC system application.<\/td>\r\n          <td>The certificate should match the PV\/DC SPD model and photovoltaic DC-side application.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <figure class=\"leeyee-article-figure\">\r\n    <img src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/ac-spd-vs-pv-dc-spd-iec-standard-application-diagram.webp\" alt=\"AC SPD and PV DC SPD application diagram for IEC 61643-11 and IEC 61643-31\" loading=\"lazy\" decoding=\"async\">\r\n    <figcaption>AC SPD is normally installed in distribution boards, while PV\/DC SPD is installed on the photovoltaic DC side.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-should-buyers-check-iec-61643-11\"><\/span>When should buyers check IEC 61643-11?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>\r\n    Buyers should check IEC 61643-11 when purchasing SPD for AC low-voltage power systems. This normally includes AC distribution boards, main switchboards, sub-distribution boards, building power panels, and industrial control cabinets.\r\n  <\/p>\r\n  <p>\r\n    For these applications, the SPD is connected to an AC system. The buyer should not only ask whether the SPD is \u201cIEC certified\u201d. The certificate should be checked against the real product model, voltage rating, Type, and discharge current values.\r\n  <\/p>\r\n\r\n  <h3>Common AC SPD applications<\/h3>\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-std-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Application<\/th>\r\n          <th>Common SPD requirement<\/th>\r\n          <th>What buyers should check<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Main AC panel<\/td>\r\n          <td>Type 1 or Type 1+2 SPD may be required when lightning current risk is high.<\/td>\r\n          <td>IEC 61643-11 certificate, Iimp, Type, Uc, pole configuration.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Distribution board<\/td>\r\n          <td>Type 2 SPD is commonly used for induced surges and switching transients.<\/td>\r\n          <td>IEC 61643-11 certificate, In, Imax, Uc, Up, poles.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Industrial cabinet<\/td>\r\n          <td>SPD selection depends on power system voltage and equipment sensitivity.<\/td>\r\n          <td>AC voltage, grounding system, SPD Type, remote signal option.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>OEM electrical panel<\/td>\r\n          <td>The SPD must match the panel design, export market, and certificate requirement.<\/td>\r\n          <td>Certificate scope, private label needs, datasheet, model marking.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-note\">\r\n    <strong>Buyer note<\/strong>\r\n    For AC SPD, the standard number alone is not enough. A certificate may cover only certain models, voltage ratings, or pole configurations. Always check whether the product you order is included in the certificate scope.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-should-buyers-check-iec-61643-31\"><\/span>When should buyers check IEC 61643-31?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>\r\n    Buyers should check IEC 61643-31 when purchasing SPD for the DC side of photovoltaic systems. This includes PV string protection, PV combiner boxes, solar inverter DC input protection, and other photovoltaic DC-side surge protection points.\r\n  <\/p>\r\n  <p>\r\n    In this application, the SPD must be designed for PV\/DC voltage behavior. A normal AC SPD certificate should not be used as proof that the product is suitable for a photovoltaic DC-side system.\r\n  <\/p>\r\n\r\n  <h3>Common PV\/DC SPD applications<\/h3>\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-std-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Application<\/th>\r\n          <th>Common SPD requirement<\/th>\r\n          <th>What buyers should check<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>PV string<\/td>\r\n          <td>DC SPD selected according to PV string voltage.<\/td>\r\n          <td>IEC 61643-31 certificate, Ucpv, Type, In, Imax, poles.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>PV combiner box<\/td>\r\n          <td>PV\/DC SPD is commonly installed before the inverter input.<\/td>\r\n          <td>Ucpv 600V, 1000V, or 1500V according to system design.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Inverter DC side<\/td>\r\n          <td>SPD should match inverter DC input voltage and protection design.<\/td>\r\n          <td>PV certificate scope, Up, discharge current rating, installation position.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Solar OEM assembly<\/td>\r\n          <td>SPD must match the combiner box or cabinet export requirement.<\/td>\r\n          <td>Certificate, datasheet, label, wiring diagram, OEM marking.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Important warning for PV buyers<\/strong>\r\n    IEC 61643-31 is for SPDs used on the DC side of photovoltaic installations. If your project involves battery energy storage, ESS, or another special DC system, do not assume that a standard PV SPD certificate is enough. Confirm the project requirement before ordering.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"product-standard-vs-selection-and-application-standard\"><\/span>Product standard vs selection and application standard<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>\r\n    Buyers often see different IEC 61643 standard numbers and get confused. A simple way to understand them is to separate product testing standards from selection and application standards.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-std-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Standard<\/th>\r\n          <th>Main meaning for buyers<\/th>\r\n          <th>How to use it in purchasing<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>IEC 61643-11<\/td>\r\n          <td>Requirements and test methods for SPDs connected to AC low-voltage power systems.<\/td>\r\n          <td>Check this for AC SPD certificates and product compliance.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>IEC 61643-31<\/td>\r\n          <td>Requirements and test methods for SPDs for photovoltaic installations.<\/td>\r\n          <td>Check this for PV\/DC SPD certificates and product compliance.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>IEC 61643-12<\/td>\r\n          <td>Selection, operation, location, and coordination principles for SPDs in AC power circuits.<\/td>\r\n          <td>Use this when considering AC SPD application and installation design.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>IEC 61643-32<\/td>\r\n          <td>Selection, installation, and coordination principles for SPDs used in PV systems.<\/td>\r\n          <td>Use this when considering PV SPD placement and coordination.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    For most purchasing work, IEC 61643-11 and IEC 61643-31 are the first standards buyers check on product certificates. IEC 61643-12 and IEC 61643-32 are more related to selection, application, installation, and coordination.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-check-an-spd-certificate-before-buying\"><\/span>How to check an SPD certificate before buying<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>\r\n    A certificate is useful only when it matches the actual product and project. Before confirming an SPD order, buyers should check the following points.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-article-figure\">\r\n    <img src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/spd-certificate-checklist-iec-61643-11-31-buyers.webp\" alt=\"SPD certificate checklist for IEC 61643-11 and IEC 61643-31 buyers\" loading=\"lazy\" decoding=\"async\">\r\n    <figcaption>Before ordering, buyers should check the standard number, model, voltage rating, SPD Type, discharge current, application side, and certificate scope.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-checklist\">\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>1. Standard number<\/strong>\r\n      <span>For AC SPD, check IEC 61643-11. For PV\/DC SPD, check IEC 61643-31.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>2. Model range<\/strong>\r\n      <span>Make sure the exact model or series is included in the certificate scope.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>3. Voltage rating<\/strong>\r\n      <span>For AC SPD, check Uc. For PV\/DC SPD, check Ucpv.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>4. SPD Type<\/strong>\r\n      <span>Confirm Type 1, Type 2, or Type 1+2 according to the installation point.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>5. Discharge current<\/strong>\r\n      <span>Check In, Imax, and Iimp. Do not compare only one current value.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>6. Pole configuration<\/strong>\r\n      <span>Check 1P, 2P, 3P, 4P, 3P+N, or PV-specific configuration.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>7. Application side<\/strong>\r\n      <span>Confirm whether the SPD is for AC power, PV DC side, signal, telecom, or another circuit.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>8. Marking and label<\/strong>\r\n      <span>For OEM orders, check whether product marking, label, and datasheet match the certificate.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"simple-decision-flow-for-spd-standard-selection\"><\/span>Simple decision flow for SPD standard selection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>\r\n    If you are not sure which standard to check, start from the installation side. The circuit type is usually the first decision point.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-flow\">\r\n    <div class=\"leeyee-flow-row\">\r\n      <div class=\"leeyee-flow-step\">\r\n        <strong>Step 1<\/strong>\r\n        <span>Identify where the SPD will be installed: AC panel or PV DC side.<\/span>\r\n      <\/div>\r\n      <div class=\"leeyee-arrow\">\u2192<\/div>\r\n      <div class=\"leeyee-flow-step\">\r\n        <strong>Step 2<\/strong>\r\n        <span>Check the correct IEC standard: 61643-11 for AC SPD, 61643-31 for PV\/DC SPD.<\/span>\r\n      <\/div>\r\n      <div class=\"leeyee-arrow\">\u2192<\/div>\r\n      <div class=\"leeyee-flow-step\">\r\n        <strong>Step 3<\/strong>\r\n        <span>Confirm voltage, Type, In, Imax, Iimp, poles, and certificate scope before ordering.<\/span>\r\n      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-mistakes-when-comparing-iec-61643-11-and-iec-61643-31\"><\/span>Common mistakes when comparing IEC 61643-11 and IEC 61643-31<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Mistake 1: Thinking all IEC 61643 certificates are the same<\/h3>\r\n  <p>\r\n    This is not correct. IEC 61643 is a family of standards. A certificate for an AC SPD does not automatically prove that the same product is suitable for PV\/DC application.\r\n  <\/p>\r\n\r\n  <h3>Mistake 2: Using an AC SPD for a PV DC system<\/h3>\r\n  <p>\r\n    PV DC systems have different operating conditions from AC power systems. For PV\/DC surge protection, buyers should check whether the SPD is designed and certified for photovoltaic DC-side use.\r\n  <\/p>\r\n\r\n  <h3>Mistake 3: Looking only at the voltage<\/h3>\r\n  <p>\r\n    Voltage is important, but it is not the only selection point. Buyers should also check SPD Type, discharge current values, protection level, pole configuration, system type, and certificate scope.\r\n  <\/p>\r\n\r\n  <h3>Mistake 4: Assuming higher rating is always better<\/h3>\r\n  <p>\r\n    A higher voltage or discharge current rating does not automatically mean the SPD is the best choice. The SPD should match the real system voltage, installation position, and protection requirement.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Procurement warning<\/strong>\r\n    If a supplier only says \u201cIEC certified\u201d but cannot show which standard, which model, which voltage, and which Type are covered, the certificate may not be enough for project approval.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-information-should-buyers-send-before-ordering\"><\/span>What information should buyers send before ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <p>\r\n    To recommend the right SPD model, the supplier needs more than a general request such as \u201cI need IEC SPD\u201d. A clear requirement helps avoid wrong models, wrong certificates, and project delays.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-checklist\">\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>System type<\/strong>\r\n      <span>AC distribution system, PV DC side, signal line, telecom line, or another application.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>Nominal voltage<\/strong>\r\n      <span>For AC systems, provide the nominal AC voltage. For PV systems, provide the maximum PV string voltage.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>Installation position<\/strong>\r\n      <span>Main panel, sub-panel, PV combiner box, inverter DC input, or equipment cabinet.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>SPD Type<\/strong>\r\n      <span>Type 1, Type 2, Type 1+2, or project-specified requirement.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>Required certificate<\/strong>\r\n      <span>IEC 61643-11, IEC 61643-31, TUV, CE, CB, or other market requirement.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-check-item\">\r\n      <strong>OEM needs<\/strong>\r\n      <span>Private label, model marking, package, datasheet, wiring diagram, or batch supply requirement.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-mini-cta\">\r\n    <p>\r\n      Send your system voltage, installation position, and required certificate. We can help check whether AC SPD or PV\/DC SPD is more suitable.\r\n    <\/p>\r\n    <a class=\"leeyee-btn leeyee-site-popup-btn\" href=\"javascript:void(0);\"><span>Send Your SPD Requirement<\/span><\/a>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"related-reading-for-spd-buyers\"><\/span>Related reading for SPD buyers<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <div class=\"leeyee-related\">\r\n    <p>\r\n      If you are checking standards before placing an order, these guides may also help you confirm voltage, discharge current, and product application.\r\n    <\/p>\r\n    <ul>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-uc-selection\/\" target=\"_blank\" rel=\"noopener\">SPD Uc Selection Guide for Distribution Boards and OEM Orders<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/dc-spd-ucpv-selection\/\" target=\"_blank\" rel=\"noopener\">DC SPD Ucpv Selection Guide for Solar PV Systems<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-in-rating-selection\/\" target=\"_blank\" rel=\"noopener\">SPD In Rating Selection Guide<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-imax-selection\/\" target=\"_blank\" rel=\"noopener\">SPD Imax Selection Guide<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/solar-spd\/\" target=\"_blank\" rel=\"noopener\">Solar SPD Guide for PV Protection<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/patents-certificates\/\" target=\"_blank\" rel=\"noopener\">LEEYEE Certificates and Technical Documents<\/a><\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"faq-iec-61643-11-vs-iec-61643-31\"><\/span>FAQ: IEC 61643-11 vs IEC 61643-31<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n  <div class=\"leeyee-faq\">\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>What is the difference between IEC 61643-31 and IEC 61643-11 standards?<\/h3>\r\n      <p>\r\n        IEC 61643-11 applies to surge protective devices connected to AC low-voltage power systems, typically up to 1000V RMS AC. IEC 61643-31 applies to SPDs installed on the DC side of photovoltaic systems, typically up to 1500V DC. For buyers, AC SPD should be checked against IEC 61643-11, while PV\/DC SPD should be checked against IEC 61643-31.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Is IEC 61643-11 for AC SPD?<\/h3>\r\n      <p>\r\n        Yes. IEC 61643-11 is the standard buyers normally check for SPD used in AC low-voltage power systems, such as distribution boards, AC panels, and industrial power cabinets.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Is IEC 61643-31 for PV SPD?<\/h3>\r\n      <p>\r\n        Yes. IEC 61643-31 is used for surge protective devices for photovoltaic installations, especially the DC side of PV systems. It is the key standard for PV\/DC SPD used in solar strings, combiner boxes, and inverter DC input protection.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Can I use an AC SPD in a PV DC system?<\/h3>\r\n      <p>\r\n        In general, no. A PV DC system should use an SPD designed and certified for photovoltaic DC-side application. An AC SPD certificate under IEC 61643-11 should not be used as proof that the SPD is suitable for PV\/DC installation.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>Can an IEC 61643-31 certificate replace IEC 61643-11 for AC panels?<\/h3>\r\n      <p>\r\n        No. IEC 61643-31 is for PV\/DC-side SPD. If the product will be installed in an AC distribution board or AC power cabinet, buyers should check the AC SPD certificate and related ratings under IEC 61643-11.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-faq-item\">\r\n      <h3>What should I check on an SPD certificate before ordering?<\/h3>\r\n      <p>\r\n        Check the standard number, product model, voltage rating, SPD Type, In, Imax, Iimp, protection level, pole configuration, and certificate scope. The certificate should match the exact SPD model and application you plan to buy.\r\n      <\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-final-cta\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-help-checking-the-correct-spd-standard\"><\/span>Need help checking the correct SPD standard?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>\r\n      LEEYEE supplies AC SPD and PV\/DC SPD for power distribution, solar PV, OEM panels, and export projects. If you are not sure whether your project should use IEC 61643-11 or IEC 61643-31, send us your system details.\r\n    <\/p>\r\n    <p>\r\n      Our team can help you check the application side, voltage rating, SPD Type, discharge current values, certificate requirement, and suitable model range before ordering.\r\n    <\/p>\r\n    <div class=\"leeyee-final-actions\">\r\n      <a class=\"leeyee-btn leeyee-site-popup-btn\" href=\"javascript:void(0);\"><span>Request SPD Model Recommendation<\/span><\/a>\r\n      <a class=\"leeyee-btn leeyee-btn-light\" href=\"https:\/\/www.cnspd.com\/contact\/\" target=\"_blank\" rel=\"noopener\"><span>Contact LEEYEE<\/span><\/a>\r\n    <\/div>\r\n  <\/section>\r\n<\/div>\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\": \"What is the difference between IEC 61643-31 and IEC 61643-11 standards?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"IEC 61643-11 applies to surge protective devices connected to AC low-voltage power systems, typically up to 1000V RMS AC. 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The certificate should match the exact SPD model and application you plan to buy.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\r\n\r\n<script>\r\n  document.addEventListener('click', function(e) {\r\n    var btn = e.target.closest('.leeyee-site-popup-btn');\r\n    if (!btn) return;\r\n\r\n    e.preventDefault();\r\n\r\n    var trigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\r\n    if (trigger) {\r\n      trigger.click();\r\n    } else {\r\n      window.open('https:\/\/www.cnspd.com\/contact\/', '_blank');\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>SPD Standardleitfaden f\u00fcr K\u00e4ufer. Kaufen Sie ein AC SPD? \u00dcberpr\u00fcfen Sie IEC 61643-11. Kaufen Sie ein PV\/DC SPD f\u00fcr die DC-Seite von Solar? \u00dcberpr\u00fcfen Sie IEC 61643-31. Dieser Leitfaden erkl\u00e4rt den Unterschied zwischen IEC 61643-11 und IEC 61643-31 auf praktische Weise. Er ist f\u00fcr Solar-EPCs, Modulhersteller, H\u00e4ndler, Elektroinstallateure und OEM-K\u00e4ufer geschrieben, die \u00fcberpr\u00fcfen m\u00fcssen\u2026<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-29791","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>IEC 61643-11 vs IEC 61643-31: AC &amp; PV SPD Guide<\/title>\n<meta name=\"description\" content=\"Learn the difference between IEC 61643-11 and IEC 61643-31 for AC SPD and PV\/DC SPD. 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