{"id":31201,"date":"2026-09-18T09:12:43","date_gmt":"2026-09-18T01:12:43","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31201"},"modified":"2026-09-18T09:13:20","modified_gmt":"2026-09-18T01:13:20","slug":"open-transition-ats-break-before-make-guide-for-compact-backup-power","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/th\/open-transition-ats\/","title":{"rendered":"Open Transition ATS: Break-Before-Make Guide for Compact Backup Power"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31201\" class=\"elementor elementor-31201\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-76caa72 e-flex e-con-boxed e-con e-parent\" data-id=\"76caa72\" 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-fd6cfc0 elementor-widget elementor-widget-html\" data-id=\"fd6cfc0\" 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class=\"ly-otats-eyebrow\">Commercial &amp; Compact Backup Power Guide<\/span>\r\n\r\n    <p>An <strong>open transition ATS<\/strong>, also called an <strong>open transition automatic transfer switch<\/strong>, disconnects the load from one source before connecting it to the alternate source. This <strong>break-before-make<\/strong> sequence creates a brief period when the load is not connected to either source. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-1\">[1]<\/a><\/sup><\/p>\r\n\r\n    <p>For compact two-source backup systems, the real selection question is not simply how fast the switch moves. Buyers must confirm whether the connected load can tolerate the interruption, how the alternate source becomes available, and whether sensitive downstream equipment needs UPS ride-through.<\/p>\r\n\r\n    <p>This guide is intended for panel builders, electrical contractors, generator or backup-power integrators, distributors and B2B buyers evaluating compact ATS applications such as the LEEYEE two-pole transfer switch shown later in this article.<\/p>\r\n  <\/div>\r\n\r\n  <section class=\"ly-otats-quick\">\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\/th\/open-transition-ats\/#quick-answer\" >Quick Answer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/th\/open-transition-ats\/#what-is-an-open-transition-ats\" >What Is an Open Transition ATS?<\/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\/th\/open-transition-ats\/#how-does-this-relate-to-the-leeyee-compact-2p-ats\" >How Does This Relate to the LEEYEE Compact 2P ATS?<\/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\/th\/open-transition-ats\/#why-does-an-open-transition-ats-interrupt-power\" >Why Does an Open Transition ATS Interrupt Power?<\/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\/th\/open-transition-ats\/#which-loads-are-a-good-match-for-a-compact-open-transition-ats\" >Which Loads Are a Good Match for a Compact Open Transition 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\/th\/open-transition-ats\/#typical-compact-ats-application-scenarios\" >Typical Compact ATS Application Scenarios<\/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\/th\/open-transition-ats\/#can-a-compact-ats-be-used-with-a-standby-generator\" >Can a Compact ATS Be Used with a Standby Generator?<\/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\/th\/open-transition-ats\/#do-sensitive-loads-need-a-ups\" >Do Sensitive Loads Need a UPS?<\/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\/th\/open-transition-ats\/#open-transition-vs-closed-transition-ats\" >Open Transition vs. Closed Transition ATS<\/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\/th\/open-transition-ats\/#what-about-delayed-transition-and-large-motor-loads\" >What About Delayed Transition and Large Motor Loads?<\/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\/th\/open-transition-ats\/#which-standard-should-be-checked\" >Which Standard Should Be Checked?<\/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\/th\/open-transition-ats\/#what-should-buyers-confirm-before-ordering-a-compact-2p-ats\" >What Should Buyers Confirm Before Ordering a Compact 2P ATS?<\/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\/th\/open-transition-ats\/#need-to-confirm-whether-this-ats-fits-your-backup-circuit\" >Need to Confirm Whether This ATS Fits Your Backup Circuit?<\/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\/th\/open-transition-ats\/#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-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/th\/open-transition-ats\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer\"><\/span>Quick Answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p><strong>An open transition ATS is a practical choice when the connected load can tolerate a temporary interruption during source transfer.<\/strong> The active source is disconnected first, and the alternate source is connected afterwards. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-1\">[1]<\/a><\/sup><\/p>\r\n\r\n    <ul>\r\n      <li><strong>Break-before-make:<\/strong> Source A opens before Source B closes.<\/li>\r\n      <li><strong>Compact backup systems:<\/strong> the key issue is whether the actual load can tolerate the transfer and restart behaviour.<\/li>\r\n      <li><strong>Generator applications:<\/strong> total outage can be much longer than ATS contact-transfer time because the generator must first become acceptable. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-2\">[2]<\/a><\/sup><\/li>\r\n      <li><strong>Sensitive controls:<\/strong> selected downstream loads may need a UPS even when open transition is suitable for the main circuit.<\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <figure class=\"ly-otats-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/open-transition-ats-break-before-make-sequence.webp\"\r\n      alt=\"Open transition ATS break-before-make switching sequence between normal and backup power sources\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>Open transition disconnects the active source before the alternate source is connected. The two source connections are therefore not intentionally closed at the same time.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"what-is-an-open-transition-ats\"><\/span>What Is an Open Transition ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>An <strong>open transition ATS<\/strong> uses a break-before-make transfer sequence. Eaton defines open transition as an operation in which the connection to one source is broken before the connection to the other source is made. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-1\">[1]<\/a><\/sup><\/p>\r\n\r\n    <div class=\"ly-otats-note\">\r\n      <span class=\"ly-otats-label\">Basic sequence<\/span>\r\n      <p><strong>Source A connected \u2192 Source A opens \u2192 load temporarily disconnected \u2192 Source B closes \u2192 load supplied by Source B.<\/strong><\/p>\r\n    <\/div>\r\n\r\n    <p>For procurement, this definition matters because <strong>open transition describes the source-switching method, not the complete backup-system recovery time.<\/strong><\/p>\r\n\r\n    <div class=\"ly-otats-engineering\">\r\n      <span class=\"ly-otats-label\">Buyer meaning<\/span>\r\n      <p>Do not approve an ATS only because a quotation says \u201cautomatic transfer\u201d or lists a short transfer time. Confirm the actual source sequence, allowable interruption, rated voltage, current, poles and the behaviour of the connected load.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"how-does-this-relate-to-the-leeyee-compact-2p-ats\"><\/span>How Does This Relate to the LEEYEE Compact 2P ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>The LEEYEE unit shown below is a compact two-source transfer switch marked <strong>ATS-2P63<\/strong>. The front panel identifies Source A, Source B, a downstream load connection and Auto\/Manual operation.<\/p>\r\n\r\n    <figure class=\"ly-otats-figure ly-otats-product-figure\">\r\n      <img loading=\"lazy\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2-1.png\"\r\n        alt=\"LEEYEE ATS-2P63 compact two-pole automatic transfer switch with Source A, Source B and load terminals\"\r\n        width=\"1448\"\r\n        height=\"1086\"\r\n        loading=\"lazy\"\r\n        decoding=\"async\">\r\n      <figcaption>LEEYEE ATS-2P63 compact two-pole transfer switch with Source A, Source B, load terminals and Auto\/Manual operating controls.<\/figcaption>\r\n    <\/figure>\r\n\r\n    <div class=\"ly-otats-product-note\">\r\n      <span class=\"ly-otats-label\">Important product boundary<\/span>\r\n      <p>This article explains <strong>open-transition selection logic<\/strong>. The exact transition sequence, rated operating data, utilization category, transfer time and permitted applications of the LEEYEE ATS-2P63 must be confirmed from the model-specific datasheet or technical documentation before project approval.<\/p>\r\n    <\/div>\r\n\r\n    <p>This product format is most relevant when the project needs a compact two-pole transfer solution between two compatible AC sources and the downstream circuit can tolerate the actual transfer behaviour.<\/p>\r\n\r\n    <p>It should not automatically be treated as a substitute for large-frame ATS equipment used in high-current generator rooms, closed-transition systems, synchronized paralleling applications or specialized motor-transfer systems.<\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"why-does-an-open-transition-ats-interrupt-power\"><\/span>Why Does an Open Transition ATS Interrupt Power?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>The interruption exists because neither source is connected to the load during the break-before-make interval. The exact switching interval depends on the ATS mechanism, controller logic and specific product design.<\/p>\r\n\r\n    <p>For a buyer, two different time periods must be kept separate.<\/p>\r\n\r\n    <h3>1. ATS transfer gap<\/h3>\r\n\r\n    <p>If both sources are already available and acceptable, the ATS still requires time to disconnect one source and connect the other. The actual value must be checked from the model-specific documentation rather than assumed from a generic industry number.<\/p>\r\n\r\n    <h3>2. Total outage when a standby generator must start<\/h3>\r\n\r\n    <p>If Source B is a standby generator that is not already running, the load must also wait while the controller detects source failure, the generator starts, and the generator reaches acceptable voltage and frequency. Only then can transfer occur. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-1\">[1]<\/a><\/sup><sup class=\"ly-otats-ref\"><a href=\"#ly-ref-2\">[2]<\/a><\/sup><\/p>\r\n\r\n    <figure class=\"ly-otats-figure\">\r\n      <img loading=\"lazy\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-transfer-time-vs-generator-outage-timeline.webp\"\r\n        alt=\"Comparison of ATS transfer time and total generator backup outage during a utility power failure\"\r\n        width=\"1448\"\r\n        height=\"1086\"\r\n        loading=\"lazy\"\r\n        decoding=\"async\">\r\n      <figcaption>ATS switching time and total generator-backed outage are different engineering values. Generator startup and source acceptance can dominate the total interruption.<\/figcaption>\r\n    <\/figure>\r\n\r\n    <div class=\"ly-otats-warning\">\r\n      <span class=\"ly-otats-label\">Do not confuse these values<\/span>\r\n      <p><strong>A short ATS transfer specification does not mean the backup generator will restore the load in the same amount of time.<\/strong> If a generator must start after utility failure, the complete backup sequence must be considered. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-2\">[2]<\/a><\/sup><\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"which-loads-are-a-good-match-for-a-compact-open-transition-ats\"><\/span>Which Loads Are a Good Match for a Compact Open Transition ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>For a compact two-pole ATS, the most useful selection question is: <strong>Can the downstream circuit tolerate a short loss of supply and then resume normal operation when the alternate source is connected?<\/strong><\/p>\r\n\r\n    <div class=\"ly-otats-table-wrap\">\r\n      <table class=\"ly-otats-table\">\r\n        <thead>\r\n          <tr>\r\n            <th>Application condition<\/th>\r\n            <th>Selection direction<\/th>\r\n            <th>What to confirm<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Condition\">General circuit can tolerate interruption<\/td>\r\n            <td data-label=\"Direction\">Often suitable<\/td>\r\n            <td data-label=\"Confirm\">Allowable outage and restart behaviour<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Condition\">Load automatically resumes after transfer<\/td>\r\n            <td data-label=\"Direction\">Often suitable<\/td>\r\n            <td data-label=\"Confirm\">No nuisance trip or manual reset required<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Condition\">Sensitive control equipment has UPS support<\/td>\r\n            <td data-label=\"Direction\">May still be suitable<\/td>\r\n            <td data-label=\"Confirm\">UPS runtime and compatibility<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Condition\">Process cannot tolerate a power blink<\/td>\r\n            <td data-label=\"Direction\">Standard open transition may not be suitable<\/td>\r\n            <td data-label=\"Confirm\">Continuity architecture<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Condition\">Large motors or stored-energy loads dominate the circuit<\/td>\r\n            <td data-label=\"Direction\">Requires separate engineering review<\/td>\r\n            <td data-label=\"Confirm\">Motor duty, residual voltage and transition method<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"ly-otats-table-conclusion\"><strong>Procurement conclusion:<\/strong> compact ATS selection should be based on the actual circuit and load behaviour, not only on nominal current.<\/p>\r\n\r\n    <figure class=\"ly-otats-figure\">\r\n      <img loading=\"lazy\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/open-transition-ats-load-selection-flowchart.webp\"\r\n        alt=\"Decision flowchart for determining whether a load is suitable for an open transition ATS\"\r\n        width=\"1448\"\r\n        height=\"1086\"\r\n        loading=\"lazy\"\r\n        decoding=\"async\">\r\n      <figcaption>The decision should start with interruption tolerance and load restart behaviour before moving to ATS model selection.<\/figcaption>\r\n    <\/figure>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"typical-compact-ats-application-scenarios\"><\/span>Typical Compact ATS Application Scenarios<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ly-otats-scenarios\">\r\n      <div class=\"ly-otats-scenario\">\r\n        <h3>Small commercial distribution circuit<\/h3>\r\n        <p>A compact two-pole ATS can be considered where two compatible AC sources supply a downstream circuit and a brief transfer interruption is acceptable.<\/p>\r\n        <p><strong>Confirm:<\/strong> voltage, current, poles, source type and load restart behaviour.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-otats-scenario\">\r\n        <h3>Control cabinet auxiliary supply<\/h3>\r\n        <p>A secondary source can provide backup for selected auxiliary circuits when the connected controls can tolerate the source-transfer sequence.<\/p>\r\n        <p><strong>Confirm:<\/strong> controller sensitivity and whether selected devices need UPS ride-through.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-otats-scenario\">\r\n        <h3>Utility plus compatible backup AC source<\/h3>\r\n        <p>The ATS can transfer between two compatible sources when the source characteristics and product ratings match the project requirements.<\/p>\r\n        <p><strong>Confirm:<\/strong> voltage, frequency and how the alternate source becomes available.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-otats-scenario\">\r\n        <h3>Sensitive load behind a UPS<\/h3>\r\n        <p>The main circuit can use open transition while a correctly selected UPS supports equipment that should not lose power during the transfer interval.<\/p>\r\n        <p><strong>Confirm:<\/strong> UPS topology, runtime, bypass arrangement and downstream load.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"ly-otats-engineering\">\r\n      <span class=\"ly-otats-label\">Application boundary<\/span>\r\n      <p>Do not infer suitability for large motors, synchronized generator paralleling, closed-transition transfer or other specialized applications from the compact ATS form factor alone. Those projects require product-specific engineering confirmation.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"can-a-compact-ats-be-used-with-a-standby-generator\"><\/span>Can a Compact ATS Be Used with a Standby Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Potentially yes, but the complete generator-control architecture must be checked.<\/p>\r\n\r\n    <p>An ATS can only transfer to a generator after the generator source is available and acceptable. Some backup systems use a separate generator controller or dry-contact start circuit, while other systems integrate start logic differently.<\/p>\r\n\r\n    <div class=\"ly-otats-warning\">\r\n      <span class=\"ly-otats-label\">Do not assume generator-start capability<\/span>\r\n      <p>The presence of Source A and Source B terminals does <strong>not<\/strong> by itself prove that an ATS provides a generator-start output. If generator autostart is required, verify the exact ATS model documentation and the generator-controller interface before ordering.<\/p>\r\n    <\/div>\r\n\r\n    <p>This distinction is especially important for a compact ATS such as the ATS-2P63 shown above. The source-transfer function and the generator-start function should be verified separately.<\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"do-sensitive-loads-need-a-ups\"><\/span>Do Sensitive Loads Need a UPS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>An ATS changes the source supplying a circuit. A UPS provides ride-through power to supported loads when its input is temporarily unavailable. These are different functions. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-5\">[5]<\/a><\/sup><\/p>\r\n\r\n    <figure class=\"ly-otats-figure\">\r\n      <img loading=\"lazy\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/open-transition-ats-ups-backup-power-architecture.webp\"\r\n        alt=\"Compact open transition ATS supplying general loads and UPS-protected sensitive loads\"\r\n        width=\"1448\"\r\n        height=\"1086\"\r\n        loading=\"lazy\"\r\n        decoding=\"async\">\r\n      <figcaption>The ATS provides source transfer, while an appropriately selected UPS can maintain selected sensitive loads during the interruption.<\/figcaption>\r\n    <\/figure>\r\n\r\n    <div class=\"ly-otats-note\">\r\n      <span class=\"ly-otats-label\">Simple distinction<\/span>\r\n      <p><strong>ATS:<\/strong> changes the source supplying the circuit.<\/p>\r\n      <p><strong>UPS:<\/strong> bridges the interruption for supported downstream loads, subject to UPS design and runtime.<\/p>\r\n    <\/div>\r\n\r\n    <p>This can be useful where most of the circuit can tolerate open transition but a PLC, network device, controller or similar sensitive load should remain powered.<\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"open-transition-vs-closed-transition-ats\"><\/span>Open Transition vs. Closed Transition ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Closed transition uses a make-before-break sequence under suitable conditions. That allows momentary source overlap, unlike standard open transition. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-1\">[1]<\/a><\/sup><\/p>\r\n\r\n    <div class=\"ly-otats-table-wrap\">\r\n      <table class=\"ly-otats-table\">\r\n        <thead>\r\n          <tr>\r\n            <th>Decision point<\/th>\r\n            <th>Open transition<\/th>\r\n            <th>Closed transition<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Decision point\">Sequence<\/td>\r\n            <td data-label=\"Open\">Break before make<\/td>\r\n            <td data-label=\"Closed\">Make before break<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Decision point\">Source overlap<\/td>\r\n            <td data-label=\"Open\">No intentional overlap<\/td>\r\n            <td data-label=\"Closed\">Brief overlap under controlled conditions<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Decision point\">Load interruption<\/td>\r\n            <td data-label=\"Open\">Expected during transfer<\/td>\r\n            <td data-label=\"Closed\">Can be avoided during qualified transfer conditions<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Decision point\">Compact ATS relevance<\/td>\r\n            <td data-label=\"Open\">Common selection concept<\/td>\r\n            <td data-label=\"Closed\">Requires equipment specifically designed for closed transition<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <div class=\"ly-otats-warning\">\r\n      <span class=\"ly-otats-label\">Product boundary<\/span>\r\n      <p>Do not interpret this comparison as a claim that the LEEYEE ATS-2P63 can be configured for closed transition. Closed-transition capability must be explicitly stated and supported by the specific ATS design and documentation.<\/p>\r\n    <\/div>\r\n\r\n    <p>Also remember that closed transition does not make a standby generator instantly available after a sudden utility failure. If the normal source has already failed, the system must still wait for the generator to become acceptable before load transfer. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-4\">[4]<\/a><\/sup><\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"what-about-delayed-transition-and-large-motor-loads\"><\/span>What About Delayed Transition and Large Motor Loads?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Delayed transition is relevant to the wider ATS market, but it should not be treated as an assumed feature of a compact two-pole ATS.<\/p>\r\n\r\n    <p>Schneider Electric \/ ASCO describes delayed transition as intentionally holding the load disconnected for a defined period before connecting the alternate source, which can be useful for inertial loads such as large motors. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-3\">[3]<\/a><\/sup><\/p>\r\n\r\n    <p>For the compact LEEYEE ATS shown on this page, buyers should <strong>not assume delayed transition, in-phase transfer or specialized motor-transfer capability unless the model-specific documentation explicitly confirms it.<\/strong><\/p>\r\n\r\n    <p>If the project includes large motors, VFD-driven equipment, high-inrush machinery or stored-energy loads, provide those details before selecting the ATS.<\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"which-standard-should-be-checked\"><\/span>Which Standard Should Be Checked?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>For IEC-market projects, the current international transfer-switching standard to review is <strong>IEC 60947-6-1:2026, Low-voltage switchgear and controlgear \u2013 Part 6-1: Multiple function equipment \u2013 Transfer switching equipment<\/strong>. The fourth edition was published in 2026 and replaces the previous edition. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-6\">[6]<\/a><\/sup><\/p>\r\n\r\n    <div class=\"ly-otats-engineering\">\r\n      <span class=\"ly-otats-label\">Certificate scope matters<\/span>\r\n      <p>Citing a standard is not the same as proving that a particular ATS model has been certified or tested to that standard. Verify the actual model marking, test report or certificate scope required by the project before approval.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"ly-otats-check-box\">\r\n    <h2><span class=\"ez-toc-section\" id=\"what-should-buyers-confirm-before-ordering-a-compact-2p-ats\"><\/span>What Should Buyers Confirm Before Ordering a Compact 2P ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>For a product such as the LEEYEE ATS-2P63, send the supplier the information that directly affects model approval:<\/p>\r\n\r\n    <ul class=\"ly-otats-checklist\">\r\n      <li>Normal source type<\/li>\r\n      <li>Backup source type<\/li>\r\n      <li>Rated system voltage<\/li>\r\n      <li>System frequency<\/li>\r\n      <li>Required current rating<\/li>\r\n      <li>Two-pole switching requirement<\/li>\r\n      <li>Line and neutral arrangement<\/li>\r\n      <li>Type of downstream load<\/li>\r\n      <li>Maximum acceptable interruption<\/li>\r\n      <li>Automatic restart behaviour<\/li>\r\n      <li>Whether a UPS is installed<\/li>\r\n      <li>Whether a generator must auto-start<\/li>\r\n      <li>How generator start is controlled<\/li>\r\n      <li>Required transfer logic<\/li>\r\n      <li>Required standard or certificate<\/li>\r\n      <li>Installation environment<\/li>\r\n      <li>Panel integration requirements<\/li>\r\n      <li>OEM label or documentation requirements<\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <div class=\"ly-otats-related\">\r\n    <h3>Need the broader ATS selection process?<\/h3>\r\n    <p>This page focuses specifically on <strong>open transition ATS<\/strong> and compact backup-power applications. For the wider selection process covering ATS operation, ratings, poles and system configuration, see the <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">Automatic Transfer Switch Selection Guide<\/a>.<\/p>\r\n  <\/div>\r\n\r\n  <section class=\"ly-otats-cta\">\r\n    <h2><span class=\"ez-toc-section\" id=\"need-to-confirm-whether-this-ats-fits-your-backup-circuit\"><\/span>Need to Confirm Whether This ATS Fits Your Backup Circuit?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Send the source voltage, required current, backup-source type, downstream load, acceptable interruption and whether a UPS or generator-start function is required.<\/p>\r\n\r\n    <p>LEEYEE can then help confirm whether the compact ATS configuration matches the actual project requirements before model approval.<\/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  <\/section>\r\n\r\n  <section>\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-otats-faq\">\r\n\r\n      <details>\r\n        <summary>Does an open transition ATS interrupt power?<\/summary>\r\n        <div class=\"ly-otats-faq-answer\">\r\n          <p>Yes. Open transition uses a break-before-make sequence, so the load is disconnected from the first source before connection to the alternate source. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-1\">[1]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>How long is the interruption?<\/summary>\r\n        <div class=\"ly-otats-faq-answer\">\r\n          <p>There is no universal transfer time for every ATS. Use the model-specific datasheet. If the backup source is a generator that must start after utility failure, total outage also includes generator starting and source acceptance. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-2\">[2]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Is a compact 2P ATS suitable for every generator application?<\/summary>\r\n        <div class=\"ly-otats-faq-answer\">\r\n          <p>No. Confirm rated voltage, current, load type, generator interface, source-acceptance logic and whether the ATS itself provides or supports the required generator-start control. Do not assume generator-start capability from the source terminals alone.<\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Can a compact open transition ATS be used with a UPS?<\/summary>\r\n        <div class=\"ly-otats-faq-answer\">\r\n          <p>Yes, depending on system design. The ATS can transfer the circuit between sources while the UPS provides ride-through to selected sensitive downstream loads. UPS topology, runtime and source compatibility must still be confirmed. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-5\">[5]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Can this ATS be used for large motors?<\/summary>\r\n        <div class=\"ly-otats-faq-answer\">\r\n          <p>Do not assume so from current rating alone. Large motors introduce inrush, residual-voltage and transition concerns. Confirm the exact utilization category, switching capability and manufacturer application limits for the ATS model before selection.<\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Does ATS-2P63 automatically mean 63 A is suitable for my project?<\/summary>\r\n        <div class=\"ly-otats-faq-answer\">\r\n          <p>No. The marking identifies the product model, but final selection must consider actual load current, load type, utilization category, protective coordination, system voltage and project requirements. Use the model-specific datasheet for approval.<\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Does closed transition eliminate generator startup delay?<\/summary>\r\n        <div class=\"ly-otats-faq-answer\">\r\n          <p>No. Closed transition can maintain continuity only when two acceptable sources are available and the required synchronization conditions are met. A standby generator that has not yet started cannot provide an immediate alternate source. <sup class=\"ly-otats-ref\"><a href=\"#ly-ref-4\">[4]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"ly-otats-references\">\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>\r\n      <li id=\"ly-ref-1\">\r\n        Eaton. <em>Fundamentals of Automatic Transfer Switches (ATS)<\/em>. Defines open transition as break-before-make and explains ATS source-transfer operation.\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\">Official Eaton source<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ly-ref-2\">\r\n        Pacific Northwest National Laboratory. <em>Best Practices for Automatic Transfer Switches Operation and Maintenance<\/em>. Describes detection of primary-source failure, generator starting, source verification and subsequent transfer.\r\n        <a href=\"https:\/\/www.pnnl.gov\/projects\/om-best-practices\/automatic-transfer-switches\" target=\"_blank\" rel=\"noopener noreferrer\">Official PNNL source<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ly-ref-3\">\r\n        Schneider Electric \/ ASCO. <em>What Are the Different ASCO ATS Transition Modes?<\/em>. Explains open and delayed transition and the use of delayed transfer for inertial loads.\r\n        <a href=\"https:\/\/www.se.com\/us\/en\/faqs\/FAQ000219583\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric source<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ly-ref-4\">\r\n        Siemens Russelectric. <em>RTS-03 ATS<\/em>. Describes generator source acceptance and transfer\/retransfer behaviour in a closed-transition ATS system.\r\n        <a href=\"https:\/\/www.siemens.com\/en-us\/products\/russelectric\/rts-03-ats\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Siemens source<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ly-ref-5\">\r\n        Eaton. <em>Uninterruptible Power Supply (UPS) FAQs<\/em>. Explains UPS emergency and ride-through power functions.\r\n        <a href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/backup-power-ups-surge-it-power-distribution\/backup-power-ups\/uninterruptible-power-supply-faq.html\" target=\"_blank\" rel=\"noopener noreferrer\">Official Eaton source<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ly-ref-6\">\r\n        International Electrotechnical Commission. <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2013 Part 6-1: Multiple function equipment \u2013 Transfer switching equipment<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n\r\n    <p class=\"ly-otats-mini\">Model ratings, transfer behaviour, utilization category, generator-start interface, standards and certificate scope must be verified from the exact LEEYEE ATS technical documentation before project approval.<\/p>\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>Commercial &amp; Compact Backup Power GuideAn open transition ATS, also called an open transition automatic transfer switch, disconnects the load from one source before connecting it to the alternate source. This break-before-make sequence creates a brief period when the load is not connected to either source. [1] For compact two-source backup systems, the real selection&#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-31201","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>Open Transition ATS: Break-Before-Make Guide for 2P Backup Systems<\/title>\n<meta name=\"description\" content=\"Learn how an open transition ATS works, when a compact 2P ATS fits backup circuits, why transfer time differs from generator outage time, and when UPS support is needed.\" \/>\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\/th\/open-transition-ats\/\" \/>\n<meta property=\"og:locale\" content=\"th_TH\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Open Transition ATS: Break-Before-Make Guide for 2P Backup Systems\" \/>\n<meta property=\"og:description\" content=\"Learn how an open transition ATS works, when a compact 2P ATS fits backup circuits, why transfer time differs from generator outage time, and when UPS support is needed.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/th\/open-transition-ats\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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