{"id":31303,"date":"2026-09-27T10:16:40","date_gmt":"2026-09-27T02:16:40","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31303"},"modified":"2026-09-27T10:17:23","modified_gmt":"2026-09-27T02:17:23","slug":"mechanical-and-electrical-interlock-in-automatic-transfer-switches","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/","title":{"rendered":"Mechanical and Electrical Interlock in Automatic Transfer Switches"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31303\" class=\"elementor elementor-31303\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cc79bf9 e-flex e-con-boxed e-con e-parent\" data-id=\"cc79bf9\" 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-8ea0b9d elementor-widget elementor-widget-html\" data-id=\"8ea0b9d\" 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padding-right:15px;\r\n  }\r\n\r\n  .ly-process li{padding-left:53px;}\r\n}\r\n\r\n@media (max-width:430px){\r\n  .ly-table-wrap td{\r\n    padding-left:0;\r\n    padding-top:31px;\r\n  }\r\n\r\n  .ly-table-wrap td::before{\r\n    top:8px;\r\n    width:100%;\r\n  }\r\n}\r\n\r\n@media (max-width:390px){\r\n  .leeyee-ats-interlock{\r\n    padding-left:13px;\r\n    padding-right:13px;\r\n  }\r\n\r\n  .ly-quick,\r\n  .ly-note,\r\n  .ly-warning,\r\n  .ly-check,\r\n  .ly-product-scope,\r\n  .ly-evidence,\r\n  .ly-cta{\r\n    padding:18px 16px;\r\n  }\r\n}\r\n\r\n@media (max-width:320px){\r\n  .leeyee-ats-interlock{\r\n    padding-left:11px;\r\n    padding-right:11px;\r\n    font-size:15.5px;\r\n  }\r\n\r\n  .leeyee-ats-interlock h2{font-size:23px;}\r\n  .leeyee-ats-interlock h3{font-size:20px;}\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-ats-interlock\">\r\n\r\n  <p class=\"ly-intro\">\r\n    Mechanical and electrical interlocking protect different parts of an automatic transfer switch transfer sequence. In a conventional <strong>open-transition ATS<\/strong>, the objective is to disconnect one source before connecting the other and prevent an unintended simultaneous connection of the two power sources.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For panel builders, generator integrators and OEM buyers, the useful question is not simply whether a supplier says an ATS has \u201cdouble interlock.\u201d The real questions are: <strong>what blocks an invalid physical switch position, what prevents a conflicting electrical command, and how can those functions be verified before sample or bulk approval?<\/strong>\r\n  <\/p>\r\n\r\n  <div class=\"ly-quick\">\r\n    <span class=\"ly-label\">Quick Answer<\/span>\r\n\r\n    <p>\r\n      <strong>Mechanical interlock<\/strong> acts on the switching mechanism and restricts incompatible physical positions. <strong>Electrical interlock<\/strong> acts on the control or operating circuit and prevents conflicting commands. The <strong>ATS controller<\/strong> monitors the sources and determines when a transfer should be initiated according to the equipment's configured logic.<sup><a href=\"#ref-3\">[3]<\/a><\/sup>\r\n    <\/p>\r\n\r\n    <div class=\"ly-quick-grid\">\r\n      <div class=\"ly-quick-item\">\r\n        <strong>Mechanical layer<\/strong>\r\n        Restricts an invalid physical switch position.\r\n      <\/div>\r\n\r\n      <div class=\"ly-quick-item\">\r\n        <strong>Electrical layer<\/strong>\r\n        Inhibits conflicting operating commands.\r\n      <\/div>\r\n\r\n      <div class=\"ly-quick-item\">\r\n        <strong>Controller layer<\/strong>\r\n        Determines when the transfer sequence should begin.\r\n      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Important technical boundary:<\/strong>\r\n    This article mainly discusses open-transition transfer, also called break-before-make. Closed-transition ATSE is different: it intentionally permits a controlled overlap of the two sources under defined conditions and has dedicated requirements in IEC 60947-6-1:2026.<sup><a href=\"#ref-1\">[1]<\/a><\/sup> Do not apply an open-transition interlock explanation directly to a closed-transition system without checking the equipment design and project documents.\r\n  <\/div>\r\n\r\n  <figure class=\"ly-figure ly-product-figure\">\r\n    <img fetchpriority=\"high\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE ATS-2P63 and ATS-4P63 compact automatic transfer switches with Auto Manual control and A B source positions\"\r\n      width=\"640\"\r\n      height=\"640\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      LEEYEE compact 2P and 4P automatic transfer switches. The front panels visibly show A\/B source positions, Auto\/Manual control and a manual operating handle. On the 4P unit shown, Source A is marked for the grid side, Source B for the generator side, and the lower terminals are marked for the load.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-evidence\">\r\n    <span class=\"ly-label\">What This Product Image Shows<\/span>\r\n\r\n    <div class=\"ly-evidence-grid\">\r\n      <div class=\"ly-evidence-col ly-evidence-visible\">\r\n        <strong>Visible on the product<\/strong>\r\n        <ul>\r\n          <li>2P and 4P compact ATS formats;<\/li>\r\n          <li>A and B source positions;<\/li>\r\n          <li>Auto \/ Manual selection;<\/li>\r\n          <li>manual operating handle;<\/li>\r\n          <li>source and load terminal areas;<\/li>\r\n          <li>grid \/ generator identification on the 4P unit shown.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n\r\n      <div class=\"ly-evidence-col ly-evidence-confirm\">\r\n        <strong>Still requires technical confirmation<\/strong>\r\n        <ul>\r\n          <li>internal mechanical interlock construction;<\/li>\r\n          <li>electrical interlock circuit;<\/li>\r\n          <li>position-feedback method;<\/li>\r\n          <li>model-specific switching sequence;<\/li>\r\n          <li>applicable compliance and test scope.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/div>\r\n  <\/div>\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\/es\/ats-mechanical-electrical-interlock\/#what-does-an-ats-interlock-actually-prevent\" >What Does an ATS Interlock Actually Prevent?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#mechanical-interlock-the-physical-safety-layer\" >Mechanical Interlock: The Physical Safety Layer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#electrical-interlock-the-command-safety-layer\" >Electrical Interlock: The Command Safety Layer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#mechanical-vs-electrical-interlock-in-an-automatic-transfer-switch\" >Mechanical vs Electrical Interlock in 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-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#controller-electrical-interlock-and-mechanical-interlock-are-different-layers\" >Controller, Electrical Interlock and Mechanical Interlock Are Different Layers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#contactor-type-ats-and-compact-switch-type-ats-do-not-use-the-same-interlock-structure\" >Contactor-Type ATS and Compact Switch-Type ATS Do Not Use the Same Interlock Structure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#why-manual-operation-is-an-important-interlock-check\" >Why Manual Operation Is an Important Interlock Check<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#what-can-go-wrong-if-interlocking-is-poor-or-damaged\" >What Can Go Wrong If Interlocking Is Poor or Damaged?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#do-not-confuse-interlocking-with-other-ats-functions\" >Do Not Confuse Interlocking With Other ATS Functions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#open-transition-and-closed-transition-must-not-be-mixed-up\" >Open Transition and Closed Transition Must Not Be Mixed Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#which-standard-should-a-buyer-check\" >Which Standard Should a Buyer Check?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#how-should-a-b2b-buyer-verify-ats-interlocking\" >How Should a B2B Buyer Verify ATS Interlocking?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#ats-interlock-checklist-before-sample-or-oem-approval\" >ATS Interlock Checklist Before Sample or OEM Approval<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#need-to-confirm-an-ats-configuration\" >Need to Confirm an ATS Configuration?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#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-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-does-an-ats-interlock-actually-prevent\"><\/span>What Does an ATS Interlock Actually Prevent?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A transfer switch connects a load between two supply sources. In open-transition operation, the first source is disconnected before the second source is connected. Eaton describes this operating principle as <strong>break-before-make<\/strong>.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    This source separation matters because two independent AC sources should not be unintentionally paralleled. Their voltage magnitude, phase angle and frequency may not match. Closed-transition equipment is specifically engineered to manage controlled overlap; conventional open-transition equipment should not be treated as if it has that capability.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p class=\"ly-table-intro\">\r\n    For an open-transition ATS, the key question is which source states are permitted during normal operation.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Normal Source<\/th>\r\n          <th>Backup Source<\/th>\r\n          <th>Engineering Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Normal Source\">Closed<\/td>\r\n          <td data-label=\"Backup Source\">Open<\/td>\r\n          <td data-label=\"Engineering Meaning\">Load supplied by the normal source.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Normal Source\">Open<\/td>\r\n          <td data-label=\"Backup Source\">Open<\/td>\r\n          <td data-label=\"Engineering Meaning\">Open-transfer interval or neutral position where provided by the design.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Normal Source\">Open<\/td>\r\n          <td data-label=\"Backup Source\">Closed<\/td>\r\n          <td data-label=\"Engineering Meaning\">Load supplied by the backup source.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Normal Source\">Closed<\/td>\r\n          <td data-label=\"Backup Source\">Closed<\/td>\r\n          <td data-label=\"Engineering Meaning\"><strong>Not a normal permitted state for conventional open-transition operation.<\/strong><\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Procurement conclusion: identify the transition type first. \u201cBoth sources closed\u201d has a very different meaning in conventional open-transition equipment and purpose-designed closed-transition equipment.\r\n  <\/p>\r\n\r\n  <div class=\"ly-meaning\">\r\n    <strong>Buyer meaning:<\/strong>\r\n    Do not ask only \u201cDoes the ATS transfer automatically?\u201d Ask what physically and electrically prevents an invalid source state in the exact model being evaluated.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"mechanical-interlock-the-physical-safety-layer\"><\/span>Mechanical Interlock: The Physical Safety Layer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A mechanical interlock uses the physical transfer mechanism to restrict incompatible switching positions. Its implementation depends on the ATS architecture. It may use a dedicated interlock between separate switching devices, a common double-throw mechanism, a linkage, a cam or another manufacturer-designed arrangement.\r\n  <\/p>\r\n\r\n  <p>\r\n    Eaton documents open-transition transfer-switch designs in which the switching devices are mechanically and electrically interlocked so that the two main contact sets cannot close simultaneously.<sup><a href=\"#ref-4\">[4]<\/a><\/sup> ABB also describes motorized change-over switches with an inbuilt mechanical interlock intended to maintain separation between two asynchronous supplies.<sup><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    The important point is that <strong>mechanical interlock describes a function, not one universal component<\/strong>. A compact integrated transfer switch does not have to look like two large contactors connected by an external locking bar.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-mechanical-interlock-break-before-make.webp\"\r\n      alt=\"Open-transition ATS mechanical interlock showing Source A on, both sources off during transfer and Source B on\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Break-before-make concept for an open-transition ATS: Source A ON \u2192 both source paths open during transfer \u2192 Source B ON. The actual mechanism and permitted positions must be verified from the selected ATS documentation.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-label\">Engineering Meaning<\/span>\r\n    <p>\r\n      Mechanical interlocking provides a physical restriction in the switching mechanism. It should not be confused with controller software. However, its exact construction, permitted positions and manual operating behaviour remain model-specific and require project confirmation.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"electrical-interlock-the-command-safety-layer\"><\/span>Electrical Interlock: The Command Safety Layer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Electrical interlocking works in the control or operating circuit. Its purpose is to prevent a conflicting close command from being completed when the opposite switching state makes that command invalid.\r\n  <\/p>\r\n\r\n  <p>\r\n    In a contactor-based ATS, one common implementation is cross-interlocking through auxiliary contacts. ABB publishes contactor-based ATS examples using two contactors, auxiliary contact blocks and mechanical interlock components as part of the transfer arrangement.<sup><a href=\"#ref-6\">[6]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    Other ATS architectures can achieve the same control objective through relays, limit switches, position feedback, electronics or manufacturer-specific actuator logic. Buyers should therefore avoid assuming that every ATS uses one standard relay circuit.\r\n  <\/p>\r\n\r\n  <h3>Typical Electrical Interlock Logic in an Open-Transition ATS<\/h3>\r\n\r\n  <p>\r\n    The exact circuit depends on the product design, but the control objective can be summarised simply: the alternate source should not receive a valid closing command until the opposite source has reached the required open state and the remaining transfer conditions are satisfied.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Detected Switch State<\/th>\r\n          <th>Typical Control Result<\/th>\r\n          <th>Why It Matters<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Detected Switch State\"><strong>Source A closed<\/strong><\/td>\r\n          <td data-label=\"Typical Control Result\">Source B close command inhibited.<\/td>\r\n          <td data-label=\"Why It Matters\">Prevents a conflicting closing command.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Detected Switch State\"><strong>Source A confirmed open<\/strong><\/td>\r\n          <td data-label=\"Typical Control Result\">Source B may be permitted to close if the remaining transfer conditions are satisfied.<\/td>\r\n          <td data-label=\"Why It Matters\">Supports break-before-make transfer.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Detected Switch State\"><strong>Source B closed<\/strong><\/td>\r\n          <td data-label=\"Typical Control Result\">Source A close command inhibited.<\/td>\r\n          <td data-label=\"Why It Matters\">Prevents the opposite conflicting command.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Detected Switch State\"><strong>Source B confirmed open<\/strong><\/td>\r\n          <td data-label=\"Typical Control Result\">Source A may be permitted to close if the remaining retransfer conditions are satisfied.<\/td>\r\n          <td data-label=\"Why It Matters\">Allows a controlled return to the preferred source.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    This table describes the control objective of a typical open-transition electrical interlock. It is not the internal wiring diagram of every ATS. Voltage conditions, delays, source availability and other permissives can also affect whether a close command is accepted.\r\n  <\/p>\r\n\r\n  <div class=\"ly-meaning\">\r\n    <strong>Buyer meaning:<\/strong>\r\n    Electrical interlocking helps stop the wrong command. Mechanical interlocking helps restrict the wrong physical position. They support the same transfer objective from different layers.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"mechanical-vs-electrical-interlock-in-an-automatic-transfer-switch\"><\/span>Mechanical vs Electrical Interlock in an Automatic Transfer Switch<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p class=\"ly-table-intro\">\r\n    The key comparison is not which interlock is \u201cbetter,\u201d but where each function acts.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Decision Point<\/th>\r\n          <th>Mechanical Interlock<\/th>\r\n          <th>Electrical Interlock<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Acts on<\/strong><\/td>\r\n          <td data-label=\"Mechanical Interlock\">Physical switching mechanism or contact system.<\/td>\r\n          <td data-label=\"Electrical Interlock\">Control, actuator or command circuit.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Main purpose<\/strong><\/td>\r\n          <td data-label=\"Mechanical Interlock\">Restrict an incompatible physical position.<\/td>\r\n          <td data-label=\"Electrical Interlock\">Block or inhibit a conflicting operating command.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Typical implementation<\/strong><\/td>\r\n          <td data-label=\"Mechanical Interlock\">Common mechanism, linkage, cam or dedicated interlock.<\/td>\r\n          <td data-label=\"Electrical Interlock\">Auxiliary contacts, relays, feedback or electronic logic.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Manual operation<\/strong><\/td>\r\n          <td data-label=\"Mechanical Interlock\">Can continue to restrict physical movement where the design provides it.<\/td>\r\n          <td data-label=\"Electrical Interlock\">Behaviour depends on how the control circuit is isolated or bypassed.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Decision Point\"><strong>Buyer verification<\/strong><\/td>\r\n          <td data-label=\"Mechanical Interlock\">Check permitted positions and the mechanical transfer sequence.<\/td>\r\n          <td data-label=\"Electrical Interlock\">Check the control diagram, feedback and command-inhibition logic.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    These are functional descriptions. The exact interlocking method must be confirmed against the manufacturer's documentation for the selected ATS model.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/mechanical-vs-electrical-interlock-ats.webp\"\r\n      alt=\"Mechanical versus electrical interlock in an automatic transfer switch control and switching system\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Functional relationship between the ATS controller, electrical interlock, actuator, mechanical interlock and power contacts. These functions work together but should not be treated as the same function.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"controller-electrical-interlock-and-mechanical-interlock-are-different-layers\"><\/span>Controller, Electrical Interlock and Mechanical Interlock Are Different Layers<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    ATS specifications often become confusing because controller logic and interlocking are described together. Separating them into three functional layers makes the transfer sequence easier to evaluate.\r\n  <\/p>\r\n\r\n  <ol class=\"ly-process\">\r\n    <li>\r\n      <strong>The controller monitors the sources.<\/strong>\r\n      In automatic mode, the controller evaluates the available sources according to the monitoring functions and settings provided by the equipment.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>The controller initiates the required transfer.<\/strong>\r\n      A transfer begins when the configured operating conditions are met.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>The electrical operating circuit permits or blocks commands.<\/strong>\r\n      Depending on the architecture, feedback, auxiliary contacts, relays or electronic logic may prevent a conflicting command from being completed.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>The operating mechanism changes the contact position.<\/strong>\r\n      In open transition, the existing source connection is broken before the alternate source connection is made.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>The mechanical construction restricts incompatible positions.<\/strong>\r\n      Where a mechanical interlock is part of the design, it provides a physical layer independent of the controller's transfer decision.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Do not treat controller software as proof of mechanical interlocking.<\/strong>\r\n    A controller can decide that Source B should not close, but the buyer should still understand what the switching mechanism permits physically and how that behaviour changes during manual operation.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"contactor-type-ats-and-compact-switch-type-ats-do-not-use-the-same-interlock-structure\"><\/span>Contactor-Type ATS and Compact Switch-Type ATS Do Not Use the Same Interlock Structure<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    This distinction matters because many ATS interlock diagrams show a contactor-based arrangement and then present it as if it represented every automatic transfer switch.\r\n  <\/p>\r\n\r\n  <h3>Contactor-Based ATS<\/h3>\r\n\r\n  <p>\r\n    In a contactor-based arrangement, two contactors can serve as the two switching devices. A dedicated mechanical interlock can physically link the contactors, while auxiliary contacts and relay logic can provide electrical cross-interlocking.\r\n  <\/p>\r\n\r\n  <p>\r\n    ABB's application note provides a useful example because it shows actual contactor-based ATS circuits together with auxiliary contacts and mechanical interlock components.<sup><a href=\"#ref-6\">[6]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h3>Compact Switch-Type ATS<\/h3>\r\n\r\n  <p>\r\n    The LEEYEE product shown near the beginning of this guide uses a compact integrated format rather than the appearance of two large externally interlocked contactors. The front panel provides visible A\/B positions together with Auto\/Manual operation and a manual handle.\r\n  <\/p>\r\n\r\n  <p>\r\n    On the 4P unit shown in the product image, the markings identify <strong>Source A as the grid side<\/strong> and <strong>Source B as the generator side<\/strong>. This statement applies to the configuration visible in that product image and should not be assumed to define every ATS configuration without checking the model documentation.\r\n  <\/p>\r\n\r\n  <p>\r\n    For this type of compact ATS, buyers should not copy a two-contactor interlock circuit onto the product or assume that an external locking bar must be visible. The exact internal switching and interlocking construction should be confirmed from the technical documentation for the selected model.\r\n  <\/p>\r\n\r\n  <div class=\"ly-product-scope\">\r\n    <span class=\"ly-label\">LEEYEE ATS-63 Product Scope<\/span>\r\n\r\n    <p>\r\n      LEEYEE ATS-63 is a compact DIN-rail automatic transfer switch for switching between two AC sources. Current product data lists 2P and 4P versions, rated current options from 6A to 63A, AC110V \/ AC220V \/ AC400V variants, 50\/60Hz operation, PC Class and AC-31B utilisation category.<sup><a href=\"#ref-7\">[7]<\/a><\/sup>\r\n    <\/p>\r\n\r\n    <div class=\"ly-spec-grid\">\r\n      <div class=\"ly-spec\">\r\n        <strong>Rated current<\/strong>\r\n        6A \/ 10A \/ 16A \/ 20A \/ 25A \/ 32A \/ 40A \/ 50A \/ 63A\r\n      <\/div>\r\n\r\n      <div class=\"ly-spec\">\r\n        <strong>Pole options<\/strong>\r\n        2P \/ 4P\r\n      <\/div>\r\n\r\n      <div class=\"ly-spec\">\r\n        <strong>Rated voltage options<\/strong>\r\n        AC110V \/ AC220V \/ AC400V\r\n      <\/div>\r\n\r\n      <div class=\"ly-spec\">\r\n        <strong>Frequency<\/strong>\r\n        50\/60Hz\r\n      <\/div>\r\n\r\n      <div class=\"ly-spec\">\r\n        <strong>Class<\/strong>\r\n        PC Class\r\n      <\/div>\r\n\r\n      <div class=\"ly-spec\">\r\n        <strong>Utilisation category<\/strong>\r\n        AC-31B\r\n      <\/div>\r\n\r\n      <div class=\"ly-spec\">\r\n        <strong>Transfer switching time<\/strong>\r\n        &lt;50 ms\r\n      <\/div>\r\n\r\n      <div class=\"ly-spec\">\r\n        <strong>Mounting<\/strong>\r\n        DIN-rail installation\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <p class=\"ly-small\">\r\n      These values describe the current ATS-63 range. They do not by themselves prove a specific internal interlock construction. For project approval, confirm the exact model's switching sequence, wiring instructions and applicable compliance documents.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Important:<\/strong>\r\n    The real LEEYEE product image demonstrates the product format and visible operating features. The two technical graphics in this article explain interlocking principles. Neither should be treated as an internal wiring or mechanical construction drawing for the ordered ATS unless the corresponding technical documentation confirms it.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-manual-operation-is-an-important-interlock-check\"><\/span>Why Manual Operation Is an Important Interlock Check<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Manual operation is especially relevant to this compact ATS format because the front panel provides both an Auto\/Manual selector and a manual operating handle. That makes manual transfer behaviour a practical item to check during sample approval.\r\n  <\/p>\r\n\r\n  <p>\r\n    When automatic controller logic is not governing the transfer in the normal way, the permitted physical positions of the mechanism become more visible to the operator. In equipment that uses a mechanical interlock, the physical restriction can remain relevant during manual operation.<sup><a href=\"#ref-8\">[8]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    The exact behaviour remains model-specific. A buyer should not force the handle beyond its permitted travel or infer internal contact position only from the front appearance.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <span class=\"ly-label\">Sample Approval Check<\/span>\r\n    <p>\r\n      With the equipment safely isolated and following the manufacturer's instructions, operate the front handle through its permitted A\/B transfer positions. Confirm that the visible position indication follows the intended transfer sequence and that normal manual operation does not permit an unintended dual-source state.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-can-go-wrong-if-interlocking-is-poor-or-damaged\"><\/span>What Can Go Wrong If Interlocking Is Poor or Damaged?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    \u201cInterlock failure\u201d is not one single fault. Mechanical damage, incorrect control wiring, defective position feedback and controller faults can produce different symptoms and different risks.\r\n  <\/p>\r\n\r\n  <div class=\"ly-risk-grid\">\r\n    <div class=\"ly-risk-card ly-risk-good\">\r\n      <h3>A reliable design should support<\/h3>\r\n      <ul>\r\n        <li>repeatable source transfer;<\/li>\r\n        <li>defined permitted positions;<\/li>\r\n        <li>clear position indication;<\/li>\r\n        <li>controlled operating commands;<\/li>\r\n        <li>safe manual operation;<\/li>\r\n        <li>a documented transfer sequence.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"ly-risk-card ly-risk-bad\">\r\n      <h3>Conditions that require investigation<\/h3>\r\n      <ul>\r\n        <li>uncertain contact position;<\/li>\r\n        <li>conflicting actuator commands;<\/li>\r\n        <li>incomplete transfer;<\/li>\r\n        <li>mechanism jamming or abnormal wear;<\/li>\r\n        <li>incorrect position feedback;<\/li>\r\n        <li>unexpected source connection.<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>\r\n    The actual consequence depends on the ATS architecture and system conditions. Do not diagnose a field problem from these symptoms alone. Isolate the equipment safely and follow the manufacturer's service procedure.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning ly-danger\">\r\n    <strong>Safety boundary:<\/strong>\r\n    Do not attempt to prove the interlock by intentionally paralleling two live unsynchronised AC sources. High-energy verification and compliance testing require appropriate equipment, procedures and qualified personnel. Closed-transition source overlap is a separate engineered function, not a field test for an open-transition ATS.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"do-not-confuse-interlocking-with-other-ats-functions\"><\/span>Do Not Confuse Interlocking With Other ATS Functions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Several ATS functions affect transfer behaviour, but they do not automatically prove that a mechanical or electrical interlock is present.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>ATS Function<\/th>\r\n          <th>What It Does<\/th>\r\n          <th>Why It Is Different From Interlocking<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"ATS Function\"><strong>Auto \/ Manual selector<\/strong><\/td>\r\n          <td data-label=\"What It Does\">Changes how operation is initiated.<\/td>\r\n          <td data-label=\"Why It Is Different\">It does not by itself prove which physical positions the mechanism permits.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"ATS Function\"><strong>Voltage monitoring<\/strong><\/td>\r\n          <td data-label=\"What It Does\">Determines whether source conditions satisfy the controller's settings.<\/td>\r\n          <td data-label=\"Why It Is Different\">Monitoring decides whether transfer may be needed; it does not mechanically separate the contacts.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"ATS Function\"><strong>Transfer delay<\/strong><\/td>\r\n          <td data-label=\"What It Does\">Controls when transfer occurs.<\/td>\r\n          <td data-label=\"Why It Is Different\">A time delay is not a physical interlock.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"ATS Function\"><strong>Source indication<\/strong><\/td>\r\n          <td data-label=\"What It Does\">Shows source availability or switching status.<\/td>\r\n          <td data-label=\"Why It Is Different\">An indication alone does not prevent an incompatible physical position.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"ATS Function\"><strong>Fuse \/ circuit breaker<\/strong><\/td>\r\n          <td data-label=\"What It Does\">Provides overcurrent or short-circuit protection according to its design.<\/td>\r\n          <td data-label=\"Why It Is Different\">Protection devices and transfer interlocking perform different functions.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Procurement conclusion: verify transfer logic, interlocking and overcurrent protection separately. Do not treat one feature as evidence for another.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"open-transition-and-closed-transition-must-not-be-mixed-up\"><\/span>Open Transition and Closed Transition Must Not Be Mixed Up<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Open transition is break-before-make: the first source connection is broken before the second source connection is made.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    Closed transition is make-before-break. Eaton describes closed transition as connecting the second source before disconnecting the first, while the sources must satisfy the equipment's synchronising requirements before the intentional overlap occurs.<sup><a href=\"#ref-2\">[2]<\/a><\/sup><sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 includes dedicated requirements for ATSE with closed-transition capability.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-meaning\">\r\n    <strong>Engineering meaning:<\/strong>\r\n    \u201cThe two sources must never be connected together\u201d is too broad as a universal ATS statement. The correct engineering boundary is that unintended simultaneous source connection must be prevented in conventional open-transition operation. Purpose-designed closed-transition equipment follows a different controlled transfer strategy.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-standard-should-a-buyer-check\"><\/span>Which Standard Should a Buyer Check?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The current international edition of IEC 60947-6-1 is <strong>IEC 60947-6-1:2026, Edition 4.0<\/strong>. It covers low-voltage transfer switching equipment, including automatically operated transfer switching equipment and additional transfer-switch configurations defined by the standard.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For procurement, the important point is to verify the documentation of the complete ATS being purchased rather than assuming that a controller, contactor or individual switching component alone proves the performance or compliance of the complete transfer assembly.\r\n  <\/p>\r\n\r\n  <div class=\"ly-meaning\">\r\n    <strong>Buyer meaning:<\/strong>\r\n    Request documentation for the exact ATS model and configuration. Confirm the rated characteristics, transfer method, wiring instructions and applicable compliance scope required by the project.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-should-a-b2b-buyer-verify-ats-interlocking\"><\/span>How Should a B2B Buyer Verify ATS Interlocking?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A useful supplier review turns the word \u201cinterlock\u201d into specific items that can be checked on a drawing, sample or operating procedure.\r\n  <\/p>\r\n\r\n  <ol class=\"ly-question-list\">\r\n    <li>\r\n      <strong>1. What transition method does this exact model use?<\/strong>\r\n      Confirm whether the equipment is open transition, closed transition or another manufacturer-defined transfer type.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>2. What prevents an incompatible physical source position?<\/strong>\r\n      Ask the supplier to identify the mechanical principle instead of accepting only \u201cyes, it has interlock.\u201d\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>3. How are conflicting electrical commands inhibited?<\/strong>\r\n      Ask whether the design uses auxiliary contacts, position feedback, relays, electronics or another defined method.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>4. What changes in manual mode?<\/strong>\r\n      Verify the permitted positions and the manufacturer's required operating procedure.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>5. How is the actual switching position detected or indicated?<\/strong>\r\n      Distinguish source-available indication from actual mechanism or contact-position indication.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>6. Which documents apply to the exact model?<\/strong>\r\n      Request the current datasheet, wiring instructions, operating instructions and project-required compliance documents.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-interlock-checklist-before-sample-or-oem-approval\"><\/span>ATS Interlock Checklist Before Sample or OEM Approval<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-check\">\r\n    <span class=\"ly-label\">Before Ordering<\/span>\r\n\r\n    <ul>\r\n      <li><strong>System voltage:<\/strong> confirm the actual AC system voltage.<\/li>\r\n      <li><strong>Frequency:<\/strong> confirm 50Hz or 60Hz requirements.<\/li>\r\n      <li><strong>Rated current:<\/strong> confirm load current and relevant starting or inrush conditions.<\/li>\r\n      <li><strong>Poles:<\/strong> confirm whether 2P or 4P switching is required by the system design.<\/li>\r\n      <li><strong>Source types:<\/strong> identify utility, generator, inverter or other AC sources.<\/li>\r\n      <li><strong>Transition method:<\/strong> confirm the required open- or closed-transition behaviour.<\/li>\r\n      <li><strong>Mechanical sequence:<\/strong> review which positions are physically possible.<\/li>\r\n      <li><strong>Electrical interlock:<\/strong> review how conflicting commands are inhibited.<\/li>\r\n      <li><strong>Manual operation:<\/strong> confirm the safe operating procedure and permitted positions.<\/li>\r\n      <li><strong>Position feedback:<\/strong> confirm how actual transfer position is indicated or reported.<\/li>\r\n      <li><strong>Upstream protection:<\/strong> coordinate the ATS with the required overcurrent and short-circuit protection.<\/li>\r\n      <li><strong>Project documents:<\/strong> verify the exact model, wiring diagram and applicable compliance scope.<\/li>\r\n      <li><strong>OEM approval:<\/strong> keep the approved sample, technical file and production configuration aligned.<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <p>\r\n    This checklist is more useful than asking only, \u201cDoes this ATS have mechanical and electrical interlock?\u201d A simple yes\/no answer does not tell a panel builder how source exclusivity is actually maintained.\r\n  <\/p>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-to-confirm-an-ats-configuration\"><\/span>Need to Confirm an ATS Configuration?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Send the system voltage, rated current, required poles, normal and backup source type, load information and required project documents. LEEYEE can help review whether the available ATS-63 configuration matches the electrical and installation requirements before sample or OEM approval.\r\n    <\/p>\r\n\r\n    <button\r\n      type=\"button\"\r\n      class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n      aria-label=\"Request ATS Configuration Review\">\r\n      <span class=\"w-btn-label\">Request ATS Configuration Review<\/span>\r\n    <\/button>\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\">\r\n    <div class=\"ly-faq-item\">\r\n      <h3>What is a mechanical interlock in an automatic transfer switch?<\/h3>\r\n      <p>\r\n        A mechanical interlock is a physical feature of the switching mechanism that restricts incompatible source positions. In conventional open-transition equipment, it can help prevent the two source switching devices from being closed together unintentionally.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>What is an electrical interlock in an ATS?<\/h3>\r\n      <p>\r\n        Electrical interlocking prevents or inhibits conflicting operating commands through the control circuit. Depending on the ATS architecture, the design can use auxiliary contacts, position feedback, relays or electronic control logic.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Why use both mechanical and electrical interlocking?<\/h3>\r\n      <p>\r\n        They act at different layers. Electrical interlocking addresses the operating command, while mechanical interlocking addresses the physical switching position. Some open-transition transfer-switch designs document both functions.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Does every ATS use two mechanically interlocked contactors?<\/h3>\r\n      <p>\r\n        No. Contactor-based ATS is only one architecture. Transfer equipment can also use switch-based or breaker-based mechanisms. ABB's contactor application note is one implementation example, not a universal internal ATS design.<sup><a href=\"#ref-6\">[6]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is mechanical interlocking still important during manual operation?<\/h3>\r\n      <p>\r\n        It can be. In designs where a mechanical interlock physically restricts the switching devices, that restriction can remain relevant during manual operation. The exact behaviour must be checked in the operating instructions for the selected model.<sup><a href=\"#ref-8\">[8]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can both ATS sources ever be connected at the same time?<\/h3>\r\n      <p>\r\n        Not as an unintended operating state in a conventional open-transition ATS. Purpose-designed closed-transition ATSE is different because it can intentionally overlap the two sources under defined and controlled conditions.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is an Auto\/Manual selector the same as an interlock?<\/h3>\r\n      <p>\r\n        No. Auto\/Manual selects how operation is initiated. It does not by itself prove how the power contacts are mechanically restricted or how conflicting electrical commands are blocked.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>How should an OEM buyer verify ATS interlocking?<\/h3>\r\n      <p>\r\n        Review the transition type, switching mechanism, permitted manual positions, control diagram, position feedback and applicable model documentation. Then verify the operating sequence on the approved sample using the manufacturer's safe operating procedure.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Does a fast transfer time prove that an ATS has reliable interlocking?<\/h3>\r\n      <p>\r\n        No. Transfer time describes timing. Interlocking describes how conflicting commands or incompatible switching positions are prevented. They should be evaluated as separate technical characteristics.\r\n      <\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-related\">\r\n    <p><strong>Related technical confirmation:<\/strong><\/p>\r\n    <p>\r\n      For ATS-63 rated current, voltage, pole options, dimensions and operating conditions, review the\r\n      <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\">LEEYEE ATS-63 technical product page<\/a>.\r\n      For a broader explanation of ATS operation and selection, review the\r\n      <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">automatic transfer switch selection guide<\/a>.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"ly-references\">\r\n    <li id=\"ref-1\">\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      Edition 4.0.\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\r\n    <li id=\"ref-2\">\r\n      Eaton.\r\n      <em>Automatic Transfer Switches (ATS) Fundamentals<\/em>.\r\n      Technical guidance covering open transition, closed transition, ATS operating modes and switching mechanisms.\r\n      <a href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton technical guidance<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-3\">\r\n      Eaton.\r\n      <em>Automatic Transfer Switch Controllers and Remote Annunciators Design Guide<\/em>.\r\n      Guidance covering ATS controller functions and transfer operation.\r\n      <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/design-guides---consultant-audience\/eaton-ats-controller-design-guide-dg140004en.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton design guide<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-4\">\r\n      Eaton.\r\n      <em>Automatic Transfer Switch, Bypass Isolation, Contactor Type, Open\/Closed Transition \u2014 Operation and Maintenance Manual<\/em>.\r\n      Technical documentation describing open-transition interlocking and closed-transition operating differences.\r\n      <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/low-voltage-power-distribution-controls-systems\/ats\/resources\/ats-bypass-manual-ib140006en.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton operation and maintenance manual<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-5\">\r\n      ABB.\r\n      <em>Motorized Transfer Switches<\/em>.\r\n      Product information covering motorized change-over switching equipment and inbuilt mechanical interlocking.\r\n      <a href=\"https:\/\/new.abb.com\/low-voltage\/products\/switches\/motor-operated-change-over-switches\" target=\"_blank\" rel=\"noopener noreferrer\">ABB product information<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-6\">\r\n      ABB.\r\n      <em>Contactor-Based Automatic Transfer Switch Solutions \u2014 Application Note<\/em>,\r\n      document 1SAC200128W0001.\r\n      Includes example ATS circuits using contactors, auxiliary contacts and mechanical interlock components.\r\n      <a href=\"https:\/\/library.e.abb.com\/public\/81dc3025a94c4b1cb605943ffa6e131f\/1SAC200128W0001_A_ApplNote_AutoTransferSwitch.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ABB application note<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-7\">\r\n      LEEYEE.\r\n      <em>ATS-63 Automatic Transfer Switch Technical Data<\/em>.\r\n      Current product information covering rated current, voltage, poles, frequency, PC Class, AC-31B utilisation category, transfer switching time and DIN-rail installation.\r\n      <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\">LEEYEE ATS-63 product page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-8\">\r\n      Eaton.\r\n      <em>Automatic Transfer Switch Operation Documentation<\/em>.\r\n      Manufacturer documentation describing manual operation and mechanical interlocking in an open-transition transfer-switch design.\r\n      <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/low-voltage-power-distribution-controls-systems\/ats\/legacy-ats-documents\/ib01602003e.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton instruction booklet<\/a>.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <p class=\"ly-small\">\r\n    Final project suitability depends on the exact ATS model, source arrangement, transition requirement, wiring method, protection coordination and applicable local or project requirements. Confirm uncertain conditions against the current model documentation before engineering approval or bulk ordering.\r\n  <\/p>\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>Mechanical and electrical interlocking protect different parts of an automatic transfer switch transfer sequence. In a conventional open-transition ATS, the objective is to disconnect one source before connecting the other and prevent an unintended simultaneous connection of the two power sources.[1][2] For panel builders, generator integrators and OEM buyers, the useful question is not simply&#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-31303","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 Mechanical &amp; Electrical Interlock: How It Works<\/title>\n<meta name=\"description\" content=\"Learn how mechanical and electrical interlocking works in an automatic transfer switch, how open-transition ATS prevents conflicting source closing, and what panel builders and OEM buyers should verify before approval.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATS Mechanical &amp; Electrical Interlock: How It Works\" \/>\n<meta property=\"og:description\" content=\"Learn how mechanical and electrical interlocking works in an automatic transfer switch, how open-transition ATS prevents conflicting source closing, and what panel builders and OEM buyers should verify before approval.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/es\/ats-mechanical-electrical-interlock\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-27T02:16:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-27T02:17:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"16 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Mechanical and Electrical Interlock in Automatic Transfer Switches\",\"datePublished\":\"2026-09-27T02:16:40+00:00\",\"dateModified\":\"2026-09-27T02:17:23+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/\"},\"wordCount\":3484,\"image\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/2.png\",\"articleSection\":[\"Isolator &amp; Switching\",\"News\",\"Technical Guides\"],\"inLanguage\":\"es\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/\",\"name\":\"ATS Mechanical & Electrical Interlock: How It Works\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/2.png\",\"datePublished\":\"2026-09-27T02:16:40+00:00\",\"dateModified\":\"2026-09-27T02:17:23+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"description\":\"Learn how mechanical and electrical interlocking works in an automatic transfer switch, how open-transition ATS prevents conflicting source closing, and what panel builders and OEM buyers should verify before approval.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/#breadcrumb\"},\"inLanguage\":\"es\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"es\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/2.png\",\"contentUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/2.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-mechanical-electrical-interlock\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.cnspd.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Mechanical and Electrical Interlock in Automatic Transfer Switches\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/\",\"name\":\"Surge Protector, Surge Arrestor, Isolating Switch - 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