{"id":31675,"date":"2026-10-15T09:04:37","date_gmt":"2026-10-15T01:04:37","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31675"},"modified":"2026-10-15T09:29:51","modified_gmt":"2026-10-15T01:29:51","slug":"automatic-transfer-switch-surge-protection-where-should-spds-be-installed","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/ats-panel-surge-protection\/","title":{"rendered":"Automatic Transfer Switch Surge Protection: Where Should SPDs Be Installed?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31675\" class=\"elementor elementor-31675\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4a4de64 e-flex e-con-boxed e-con e-parent\" data-id=\"4a4de64\" 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-903965f elementor-widget elementor-widget-html\" data-id=\"903965f\" 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}\r\n  .leeyee-ats-spd-guide h3{\r\n    font-size:22px;\r\n  }\r\n  .leeyee-ats-spd-guide .ly-role-grid{\r\n    grid-template-columns:1fr;\r\n  }\r\n}\r\n\r\n@media(max-width:600px){\r\n  .leeyee-ats-spd-guide{\r\n    padding:4px 16px 48px;\r\n    font-size:16px;\r\n  }\r\n  .leeyee-ats-spd-guide .ly-intro{\r\n    font-size:17px;\r\n  }\r\n  .leeyee-ats-spd-guide h2{\r\n    margin-top:44px;\r\n    font-size:27px;\r\n  }\r\n  .leeyee-ats-spd-guide h3{\r\n    font-size:21px;\r\n  }\r\n  .leeyee-ats-spd-guide .ly-quick,\r\n  .leeyee-ats-spd-guide .ly-note,\r\n  .leeyee-ats-spd-guide .ly-warning,\r\n  .leeyee-ats-spd-guide .ly-checklist,\r\n  .leeyee-ats-spd-guide .ly-cta{\r\n    padding:18px;\r\n  }\r\n  .leeyee-ats-spd-guide .ly-answer-grid,\r\n  .leeyee-ats-spd-guide .ly-check-grid{\r\n    grid-template-columns:1fr;\r\n  }\r\n  .leeyee-about-btn-light.leeyee-site-popup-btn{\r\n    width:100%;\r\n    min-height:50px;\r\n    padding:12px 18px;\r\n  }\r\n}\r\n\r\n@media(max-width:430px){\r\n  .leeyee-ats-spd-guide{\r\n    padding-left:14px;\r\n    padding-right:14px;\r\n  }\r\n  .leeyee-ats-spd-guide h2{\r\n    font-size:25px;\r\n  }\r\n  .leeyee-ats-spd-guide h3{\r\n    font-size:20px;\r\n  }\r\n  .leeyee-ats-spd-guide table{\r\n    min-width:640px;\r\n    font-size:14.5px;\r\n  }\r\n  .leeyee-ats-spd-guide th,\r\n  .leeyee-ats-spd-guide td{\r\n    padding:11px;\r\n  }\r\n}\r\n\r\n@media(max-width:360px){\r\n  .leeyee-ats-spd-guide{\r\n    padding-left:12px;\r\n    padding-right:12px;\r\n  }\r\n  .leeyee-ats-spd-guide h2{\r\n    font-size:24px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-ats-spd-guide\">\r\n\r\n  <p class=\"ly-intro\">\r\n    An automatic transfer switch and a surge protective device solve two different problems. The ATS transfers a load between available power sources; an SPD limits transient overvoltage and diverts surge current. For a backup-power system, surge protection should therefore be evaluated around the ATS rather than treated as an internal ATS function. <sup>[1][2]<\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-quick\">\r\n    <span class=\"ly-quick-label\">Quick Answer<\/span>\r\n    <p>\r\n      <strong>An ATS does not replace an SPD.<\/strong> Surge protection may be considered on the utility input, generator input, ATS output or downstream distribution, but the correct locations depend on the complete power architecture rather than the ATS ampere rating alone. <sup>[2][3][4]<\/sup>\r\n    <\/p>\r\n    <div class=\"ly-core-answer\">\r\n      For panel builders, the practical question is not \u201cDoes every ATS need three SPDs?\u201d It is \u201cWhich surge paths exist in this project, what protection already exists, and where should the next coordinated protection stage be placed?\u201d\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-answer-grid\">\r\n    <div class=\"ly-answer-item\">\r\n      <strong>Utility side<\/strong>\r\n      Check whether an upstream coordinated SPD already protects the incoming supply.\r\n    <\/div>\r\n    <div class=\"ly-answer-item\">\r\n      <strong>Generator side<\/strong>\r\n      Review separately, especially when the generator is outdoors, remote or connected by exposed conductors.\r\n    <\/div>\r\n    <div class=\"ly-answer-item\">\r\n      <strong>ATS output<\/strong>\r\n      A downstream SPD may form an additional protection stage for distribution equipment and sensitive loads.\r\n    <\/div>\r\n    <div class=\"ly-answer-item\">\r\n      <strong>SPD type<\/strong>\r\n      Do not choose Type 1 or Type 2 from ATS current alone. Installation position and the complete surge-protection concept matter.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img fetchpriority=\"high\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-surge-protection-system-diagram.webp\"\r\n         alt=\"ATS surge protection system diagram showing SPD positions on utility, generator and load sides\"\r\n         width=\"1448\"\r\n         height=\"1086\"\r\n         loading=\"eager\"\r\n         decoding=\"async\">\r\n    <figcaption>\r\n      Possible SPD positions around a compact automatic transfer switch. The marked positions are engineering options, not a requirement to install an SPD at every point.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-panel-surge-protection\/#ats-and-spd-perform-different-electrical-functions\" >ATS and SPD Perform Different Electrical Functions<\/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\/id\/ats-panel-surge-protection\/#where-can-an-spd-be-installed-around-an-automatic-transfer-switch\" >Where Can an SPD Be Installed Around an Automatic Transfer Switch?<\/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\/id\/ats-panel-surge-protection\/#does-the-utility-input-side-need-surge-protection\" >Does the Utility Input Side Need Surge Protection?<\/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\/id\/ats-panel-surge-protection\/#does-the-generator-input-need-its-own-spd\" >Does the Generator Input Need Its Own 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\/id\/ats-panel-surge-protection\/#should-the-spd-be-installed-before-or-after-the-ats\" >Should the SPD Be Installed Before or After the ATS?<\/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\/id\/ats-panel-surge-protection\/#do-you-need-spds-on-all-three-sides\" >Do You Need SPDs on All Three Sides?<\/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\/id\/ats-panel-surge-protection\/#type-1-or-type-2-spd-for-an-ats-system\" >Type 1 or Type 2 SPD for an ATS System?<\/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\/id\/ats-panel-surge-protection\/#how-mccb-spd-and-ats-work-together\" >How MCCB, SPD and ATS Work Together<\/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\/id\/ats-panel-surge-protection\/#what-should-buyers-confirm-when-ordering-ats-spd-together\" >What Should Buyers Confirm When Ordering ATS + SPD Together?<\/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\/id\/ats-panel-surge-protection\/#common-ats-surge-protection-design-mistakes\" >Common ATS Surge-Protection Design Mistakes<\/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\/id\/ats-panel-surge-protection\/#ats-spd-combination-sourcing-for-panel-builders\" >ATS + SPD Combination Sourcing for Panel Builders<\/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\/id\/ats-panel-surge-protection\/#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-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/id\/ats-panel-surge-protection\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"ats-and-spd-perform-different-electrical-functions\"><\/span>ATS and SPD Perform Different Electrical Functions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 covers transfer switching equipment used to transfer a load between power supply sources. That source-transfer function is fundamentally different from surge protection. <sup>[1]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 61643-11:2025 applies to surge protective devices connected to low-voltage AC power systems. These devices are intended to limit surge voltages and divert surge currents arising from lightning effects or other transient overvoltages. <sup>[2]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    Therefore, an ATS can perform its source-transfer function correctly while the surrounding installation still requires separate surge-protection measures.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure ly-product-figure\">\r\n    <img src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n         alt=\"LEEYEE compact 2P and 4P automatic transfer switches for normal and emergency power source transfer\"\r\n         loading=\"lazy\"\r\n         decoding=\"async\">\r\n    <figcaption>\r\n      LEEYEE compact 2P and 4P automatic transfer switches. These devices perform source transfer between normal and emergency power supplies; surge protection is provided separately by the surrounding electrical system.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-note-title\">LEEYEE product scope<\/span>\r\n    <p>\r\n      LEEYEE's standard ATS offering is a compact integrated automatic transfer switch, including configurations such as 2P and 4P for normal\/emergency source transfer. It is supplied as the ATS device rather than as a complete ATS cabinet, AMF cabinet or bypass-isolation system.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-figure ly-mask-logo\">\r\n    <div class=\"ly-image-mask-wrap\">\r\n      <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-spd-mccb-function-comparison.webp\"\r\n           alt=\"Comparison of ATS SPD and MCCB functions in a backup power distribution system\"\r\n           width=\"1448\"\r\n           height=\"1086\"\r\n           loading=\"lazy\"\r\n           decoding=\"async\">\r\n    <\/div>\r\n    <figcaption>\r\n      ATS, SPD and MCCB functions should be evaluated separately before they are coordinated in the same low-voltage panel.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-role-grid\">\r\n    <div class=\"ly-role\">\r\n      <span class=\"ly-role-name\">ATS<\/span>\r\n      <p>Transfers the load between normal and emergency power sources.<\/p>\r\n    <\/div>\r\n    <div class=\"ly-role\">\r\n      <span class=\"ly-role-name\">SPD<\/span>\r\n      <p>Limits transient overvoltage and diverts surge current.<\/p>\r\n    <\/div>\r\n    <div class=\"ly-role\">\r\n      <span class=\"ly-role-name\">MCCB<\/span>\r\n      <p>Provides circuit interruption, overcurrent protection and isolation according to the selected device and system design.<\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-note-title\">Engineering meaning<\/span>\r\n    <p>\r\n      A higher-current ATS does not replace an SPD. An SPD does not replace an MCCB. Panel builders should verify source transfer, overcurrent protection, short-circuit performance and surge protection separately, then coordinate them at system level.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-can-an-spd-be-installed-around-an-automatic-transfer-switch\"><\/span>Where Can an SPD Be Installed Around an Automatic Transfer Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    For engineering review, divide the power path into three areas: the utility or normal source, the generator or emergency source, and the load side after the transfer switch.\r\n  <\/p>\r\n\r\n  <p>\r\n    Schneider Electric application guidance for automatic transfer switches discusses surge protection at the service-entry side, generator side and transfer-switch load side. System arrangement and existing protection affect the final solution. <sup>[5]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    This does not mean every ATS installation requires three identical SPDs.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>SPD position<\/th>\r\n          <th>Why evaluate it?<\/th>\r\n          <th>What must be confirmed?<\/th>\r\n          <th>Procurement meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td><strong>Utility \/ normal source<\/strong><\/td>\r\n          <td>Incoming lightning-related or switching transients<\/td>\r\n          <td>Service entrance, upstream SPD, earthing and lightning protection concept<\/td>\r\n          <td>Check existing upstream protection first<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td><strong>Generator \/ emergency source<\/strong><\/td>\r\n          <td>Separate surge exposure through generator conductors<\/td>\r\n          <td>Generator location, cable route, exposure and existing protection<\/td>\r\n          <td>Outdoor and remote circuits deserve separate review<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td><strong>ATS output \/ load side<\/strong><\/td>\r\n          <td>Additional protection for downstream equipment<\/td>\r\n          <td>Load sensitivity, downstream panels and upstream SPD coordination<\/td>\r\n          <td>Use as part of a coordinated protection concept<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    The ATS nameplate alone cannot determine where the SPD belongs. Review the complete single-line architecture first.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-the-utility-input-side-need-surge-protection\"><\/span>Does the Utility Input Side Need Surge Protection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The utility side is one of the first locations engineers review because transient overvoltages can enter from the incoming power system.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 62305-4:2024 addresses surge-protection measures for electrical and electronic systems within structures exposed to lightning electromagnetic effects. IEC 60364-5-53 covers selection and erection requirements relevant to protective, switching and control equipment in low-voltage installations. <sup>[3][4]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    If a suitable upstream SPD already exists, another SPD immediately beside the ATS may or may not provide meaningful additional protection.\r\n  <\/p>\r\n\r\n  <div class=\"ly-scenario\">\r\n    <strong>Scenario: an upstream SPD already exists<\/strong>\r\n    Confirm its location, type, voltage ratings, protection level and coordination before adding another stage near the ATS.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-the-generator-input-need-its-own-spd\"><\/span>Does the Generator Input Need Its Own SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The emergency source should be assessed independently because its physical installation may create a different surge path.\r\n  <\/p>\r\n\r\n  <p>\r\n    An outdoor or remotely installed generator may be connected through long or exposed conductors. That differs from a compact indoor installation with short protected cable runs.\r\n  <\/p>\r\n\r\n  <p>\r\n    ATS surge-protection application guidance also identifies generator-side power and external control or monitoring circuits as areas that may require separate consideration. <sup>[5]<\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-warning-title\">Do not assume every generator input needs the same SPD<\/span>\r\n    <p>\r\n      Confirm generator location, cable exposure, system voltage, earthing arrangement, existing protection and the applicable project standard before fixing the SPD configuration.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"should-the-spd-be-installed-before-or-after-the-ats\"><\/span>Should the SPD Be Installed Before or After the ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    There is no universal \u201cbefore\u201d or \u201cafter\u201d answer.\r\n  <\/p>\r\n\r\n  <p>\r\n    An upstream SPD can address transient overvoltages arriving from a source. A downstream SPD can form another protection stage closer to distribution equipment or sensitive loads.\r\n  <\/p>\r\n\r\n  <p>\r\n    Some installations use coordinated SPDs at several levels. A compact installation with suitable upstream protection may not require another device at every possible position.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-spd-placement-decision-flow.webp\"\r\n         alt=\"Decision flow for choosing SPD installation positions around an automatic transfer switch\"\r\n         width=\"1448\"\r\n         height=\"1086\"\r\n         loading=\"lazy\"\r\n         decoding=\"async\">\r\n    <figcaption>\r\n      Decision flow for reviewing utility-side, generator-side and downstream surge protection without assuming every ATS needs the same three-SPD arrangement.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"do-you-need-spds-on-all-three-sides\"><\/span>Do You Need SPDs on All Three Sides?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    <strong>No universal rule requires the same three-SPD arrangement for every ATS system.<\/strong>\r\n  <\/p>\r\n\r\n  <div class=\"ly-scenario\">\r\n    <strong>Existing service-entrance SPD near the ATS<\/strong>\r\n    The normal-source side may already have a protection stage. Verify coordination before adding another SPD.\r\n  <\/div>\r\n\r\n  <div class=\"ly-scenario\">\r\n    <strong>Outdoor generator with a long feeder<\/strong>\r\n    Generator-side protection deserves stronger consideration because the conductors may form a separate exposure path.\r\n  <\/div>\r\n\r\n  <div class=\"ly-scenario\">\r\n    <strong>ATS supplies PLC, BMS, UPS or control equipment<\/strong>\r\n    A downstream SPD may provide an additional coordinated protection stage for sensitive electronics.\r\n  <\/div>\r\n\r\n  <div class=\"ly-scenario\">\r\n    <strong>Compact indoor system with coordinated upstream protection<\/strong>\r\n    Do not add another SPD merely because a diagram shows an available installation point.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"type-1-or-type-2-spd-for-an-ats-system\"><\/span>Type 1 or Type 2 SPD for an ATS System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Do not determine SPD type from the ATS current rating.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 61643-11:2025 specifies requirements and test methods for SPDs connected to low-voltage AC systems, including requirements relevant to Type 1 and Type 2 devices. <sup>[2]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    In an IEC-oriented project, Type 1 protection is generally associated with locations where lightning-current discharge capability forms part of the lightning protection concept. Type 2 SPDs are commonly used at distribution levels for transient overvoltage protection and coordinated downstream protection.\r\n  <\/p>\r\n\r\n  <p>\r\n    Final selection still depends on installation position, external lightning protection, earthing system, existing upstream protection, Uc, Up and required surge-current capability.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-type-1-type-2-spd-selection-overview.webp\"\r\n         alt=\"Type 1 and Type 2 SPD selection overview for ATS utility generator and load-side applications\"\r\n         width=\"1448\"\r\n         height=\"1086\"\r\n         loading=\"lazy\"\r\n         decoding=\"async\">\r\n    <figcaption>\r\n      Type 1 versus Type 2 is an installation and surge-exposure decision. It should not be inferred from ATS amperage alone.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-note-title\">IEC and UL terminology are not automatically equivalent<\/span>\r\n    <p>\r\n      IEC and UL use different classification and installation frameworks. Buyers should confirm the required market standard and product certification before OEM approval. <sup>[6]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-mccb-spd-and-ats-work-together\"><\/span>How MCCB, SPD and ATS Work Together<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A backup-power panel may use MCCBs or other protective devices together with SPDs and a compact ATS, but each component has a different purpose.\r\n  <\/p>\r\n\r\n  <p>\r\n    The ATS handles source transfer. The SPD handles transient overvoltage. The MCCB handles circuit protection and switching functions appropriate to its design.\r\n  <\/p>\r\n\r\n  <p>\r\n    SPD backup protection also requires project confirmation. Fuse or breaker ratings, conductor size, prospective short-circuit current and permitted installation arrangement must follow the selected SPD documentation and applicable standard.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-warning-title\">Project confirmation required<\/span>\r\n    <p>\r\n      Do not determine conductor size, SPD backup fuse or breaker rating, protection mode, neutral arrangement or short-circuit coordination from a generic article. Confirm the actual SPD model and project conditions.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-buyers-confirm-when-ordering-ats-spd-together\"><\/span>What Should Buyers Confirm When Ordering ATS + SPD Together?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <span class=\"ly-checklist-title\">Prepare the following information:<\/span>\r\n\r\n    <div class=\"ly-check-grid\">\r\n      <div class=\"ly-check-group\">\r\n        <strong>ATS information<\/strong>\r\n        <ul>\r\n          <li>Rated system voltage<\/li>\r\n          <li>Single-phase or three-phase<\/li>\r\n          <li>Rated current<\/li>\r\n          <li>2P, 3P or 4P configuration<\/li>\r\n          <li>Normal and emergency source type<\/li>\r\n          <li>Open-transition requirement<\/li>\r\n          <li>Required standard or project specification<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n\r\n      <div class=\"ly-check-group\">\r\n        <strong>SPD information<\/strong>\r\n        <ul>\r\n          <li>System voltage<\/li>\r\n          <li>Earthing arrangement<\/li>\r\n          <li>Proposed installation position<\/li>\r\n          <li>Type 1, Type 2 or coordinated protection requirement<\/li>\r\n          <li>Uc and Up requirements<\/li>\r\n          <li>In, Imax or Iimp where applicable<\/li>\r\n          <li>Required certification or market standard<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>\r\n    LEEYEE supplies compact automatic transfer switches and surge protective devices. The surrounding MCCB arrangement, enclosure, generator controls and complete panel architecture remain project-specific unless separately confirmed.\r\n  <\/p>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Need to review an ATS + SPD configuration?<\/h3>\r\n    <p>\r\n      Send the system voltage, ATS current and poles, utility\/generator arrangement, earthing system, proposed SPD positions and required standard.\r\n    <\/p>\r\n    <button type=\"button\"\r\n            class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n            aria-label=\"Send Your Panel Requirement\">\r\n      <span class=\"w-btn-label\">Send Your Panel Requirement<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-ats-surge-protection-design-mistakes\"><\/span>Common ATS Surge-Protection Design Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>1. Treating surge protection as an ATS built-in function<\/h3>\r\n  <p>\r\n    Do not assume a transfer switch includes surge protection unless the actual assembly documentation says so.\r\n  <\/p>\r\n\r\n  <h3>2. Installing the same SPD at every possible position<\/h3>\r\n  <p>\r\n    Utility, generator and downstream positions can have different surge exposure, earthing and coordination requirements.\r\n  <\/p>\r\n\r\n  <h3>3. Choosing an SPD from ATS current alone<\/h3>\r\n  <p>\r\n    ATS current does not by itself determine SPD Type, Uc, Up, In, Imax or Iimp.\r\n  <\/p>\r\n\r\n  <h3>4. Ignoring existing upstream protection<\/h3>\r\n  <p>\r\n    Additional SPDs should be coordinated with devices already installed.\r\n  <\/p>\r\n\r\n  <h3>5. Forgetting control and communication circuits<\/h3>\r\n  <p>\r\n    Remote start contacts, BMS links and communication circuits may require separate signal-line protection. Power-line SPDs do not automatically protect every signal interface. <sup>[5]<\/sup>\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-spd-combination-sourcing-for-panel-builders\"><\/span>ATS + SPD Combination Sourcing for Panel Builders<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    ATS and SPD combination sourcing can simplify model confirmation when the system architecture is already known. The benefit is not that they become one device; it is that their requirements can be reviewed together before panel production.\r\n  <\/p>\r\n\r\n  <p>\r\n    For distribution-level SPD information, see the\r\n    <a href=\"https:\/\/www.cnspd.com\/shop\/type-2-surge-protective-device\/\">LEEYEE Type 2 Surge Protective Device<\/a>.\r\n    For ATS operating logic and selection, see the\r\n    <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">LEEYEE Automatic Transfer Switch Selection Guide<\/a>.\r\n  <\/p>\r\n\r\n  <div class=\"ly-related\">\r\n    <strong>Procurement conclusion<\/strong>\r\n    A useful ATS + SPD enquiry should include a single-line diagram or a clear description of both sources, ATS rating, earthing arrangement, existing upstream protection and downstream loads.\r\n  <\/div>\r\n\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=\"ly-faq-item\">\r\n    <h3>Does every automatic transfer switch need surge protection?<\/h3>\r\n    <p>\r\n      Not as a universal rule. Review source exposure, existing protection, generator location, earthing and downstream load sensitivity.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Should an SPD be installed before or after an ATS?<\/h3>\r\n    <p>\r\n      Either or both locations may be appropriate. The final arrangement depends on source exposure and coordination with other SPDs.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Does a generator input need its own SPD?<\/h3>\r\n    <p>\r\n      It depends. Generator-side protection deserves stronger consideration when the generator is outdoors, remote or connected by long or exposed conductors.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Can the same Type 2 SPD be used on utility and generator inputs?<\/h3>\r\n    <p>\r\n      Do not assume so. Each source should be checked for voltage, earthing, installation position and required surge-current capability.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Is an MCCB enough to protect an ATS from surge voltage?<\/h3>\r\n    <p>\r\n      No. MCCBs and SPDs address different electrical events. An SPD is specifically intended to limit transient overvoltage and divert surge current.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-faq-item\">\r\n    <h3>Does LEEYEE supply the complete ATS panel?<\/h3>\r\n    <p>\r\n      This article does not make that claim. LEEYEE's standard offering is the compact integrated ATS device, and LEEYEE also supplies surge protective devices. Complete cabinet design and project wiring must be confirmed separately.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Confirm the system before fixing the models<\/h3>\r\n    <p>\r\n      Share the utility and generator voltage, ATS current and poles, earthing system, existing upstream SPD, downstream load type and required project standard.\r\n    <\/p>\r\n    <button type=\"button\"\r\n            class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n            aria-label=\"Request Model Recommendation\">\r\n      <span class=\"w-btn-label\">Request Model Recommendation<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\r\n  <section class=\"ly-references\">\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ol>\r\n      <li>\r\n        International Electrotechnical Commission (IEC),\r\n        <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n      <\/li>\r\n      <li>\r\n        International Electrotechnical Commission (IEC),\r\n        <em>IEC 61643-11:2025 \u2014 Low-voltage surge protective devices \u2014 Part 11: Surge protective devices connected to AC low-voltage power systems \u2014 Requirements and test methods<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n      <\/li>\r\n      <li>\r\n        International Electrotechnical Commission (IEC),\r\n        <em>IEC 60364-5-53:2019 + AMD1:2020 + AMD2:2024 \u2014 Low-voltage electrical installations \u2014 Part 5-53<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/104394\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n      <\/li>\r\n      <li>\r\n        International Electrotechnical Commission (IEC),\r\n        <em>IEC 62305-4:2024 \u2014 Protection against lightning \u2014 Part 4: Electrical and electronic systems within structures<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29590\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n      <\/li>\r\n      <li>\r\n        Schneider Electric,\r\n        <em>Locations for a surge protective device in an Automatic transfer switch application<\/em>,\r\n        FAQ000255143.\r\n        <a href=\"https:\/\/www.se.com\/ca\/en\/faqs\/FAQ000255143\/\" target=\"_blank\" rel=\"noopener noreferrer\">Schneider Electric application guidance<\/a>.\r\n      <\/li>\r\n      <li>\r\n        UL Solutions,\r\n        <em>UL iQ for Surge Protective Devices<\/em>.\r\n        <a href=\"https:\/\/iq.ul.com\/ul\/cert.aspx?ULID=102539237\" target=\"_blank\" rel=\"noopener noreferrer\">UL Solutions certification information<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\ndocument.addEventListener('DOMContentLoaded', function () {\r\n  var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n  aboutPopupButtons.forEach(function (button) {\r\n    button.addEventListener('click', function () {\r\n      var realPopupTrigger = document.querySelector(\r\n        '.w-popup.ush_popup_1 .w-popup-trigger'\r\n      );\r\n\r\n      if (realPopupTrigger) {\r\n        realPopupTrigger.click();\r\n      } else {\r\n        window.open(\r\n          'https:\/\/www.cnspd.com\/contact\/',\r\n          '_blank',\r\n          'noopener'\r\n        );\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>An automatic transfer switch and a surge protective device solve two different problems. The ATS transfers a load between available power sources; an SPD limits transient overvoltage and diverts surge current. For a backup-power system, surge protection should therefore be evaluated around the ATS rather than treated as an internal ATS function. [1][2] Quick Answer&#8230;<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[490,1,422],"tags":[],"class_list":["post-31675","post","type-post","status-publish","format-standard","hentry","category-isolator-switching","category-news","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ATS Surge Protection: Where to Install an SPD | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn where surge protection should be considered around an automatic transfer switch, including utility, generator and load sides, Type 1 vs Type 2 SPD selection, MCCB coordination and ATS + SPD procurement.\" \/>\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\/id\/ats-panel-surge-protection\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATS Surge Protection: Where to Install an SPD | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn where surge protection should be considered around an automatic transfer switch, including utility, generator and load sides, Type 1 vs Type 2 SPD selection, MCCB coordination and ATS + SPD procurement.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/id\/ats-panel-surge-protection\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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