{"id":31670,"date":"2026-10-14T13:20:32","date_gmt":"2026-10-14T05:20:32","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31670"},"modified":"2026-10-14T13:21:16","modified_gmt":"2026-10-14T05:21:16","slug":"ats-and-ups-coordination-guide-for-critical-loads","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/pt\/ats-ups-coordination-guide\/","title":{"rendered":"ATS and UPS Coordination Guide for Critical Loads"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31670\" class=\"elementor elementor-31670\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9f4dd73 e-flex e-con-boxed e-con e-parent\" data-id=\"9f4dd73\" 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-8a894d3 elementor-widget elementor-widget-html\" data-id=\"8a894d3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n\/* =========================================================\r\n   LEEYEE B2B Technical Article\r\n   Page 70 \u2014 ATS and UPS Coordination Guide for Critical Loads\r\n   ========================================================= *\/\r\n\r\n.leeyee-ats-ups {\r\n  --ly-blue: #004898;\r\n  --ly-blue-dark: #00386f;\r\n  --ly-blue-pale: #eef5ff;\r\n  --ly-blue-xpale: #f7fbff;\r\n  --ly-text: #273440;\r\n  --ly-heading: #172631;\r\n  --ly-muted: #627181;\r\n  --ly-border: #d9e4ec;\r\n  --ly-warning-bg: #fff9ea;\r\n  --ly-warning-border: #d7a43a;\r\n  --ly-risk-bg: #fff5f3;\r\n  --ly-risk-border: #cc655b;\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 20px 52px;\r\n  color: var(--ly-text);\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  box-sizing: border-box;\r\n}\r\n\r\n.leeyee-ats-ups *,\r\n.leeyee-ats-ups *::before,\r\n.leeyee-ats-ups *::after {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.leeyee-ats-ups p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n.leeyee-ats-ups h2 {\r\n  margin: 52px 0 18px;\r\n  color: var(--ly-heading);\r\n  font-size: 32px;\r\n  line-height: 1.25;\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-ats-ups h3 {\r\n  margin: 32px 0 13px;\r\n  color: var(--ly-heading);\r\n  font-size: 23px;\r\n  line-height: 1.34;\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-ats-ups strong {\r\n  color: var(--ly-heading);\r\n}\r\n\r\n.leeyee-ats-ups a {\r\n  color: var(--ly-blue);\r\n  text-decoration: underline;\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 2px;\r\n}\r\n\r\n.leeyee-ats-ups a:hover {\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n.leeyee-ats-ups-intro {\r\n  margin-bottom: 26px;\r\n  font-size: 18px;\r\n  line-height: 1.72;\r\n}\r\n\r\n\/* Quick Answer *\/\r\n.leeyee-ats-ups-quick {\r\n  margin: 28px 0 30px;\r\n  padding: 24px 26px;\r\n  background: var(--ly-blue-xpale);\r\n  border-left: 4px solid 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tr:nth-child(even) {\r\n  background: #fafcfe;\r\n}\r\n\r\n.leeyee-ats-ups-table-conclusion {\r\n  margin: 9px 0 25px;\r\n  color: #435360;\r\n  font-size: 15px;\r\n}\r\n\r\n\/* Timeline *\/\r\n.leeyee-ats-ups-timeline {\r\n  margin: 25px 0;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: ly-step;\r\n}\r\n\r\n.leeyee-ats-ups-timeline li {\r\n  position: relative;\r\n  margin: 0;\r\n  padding: 0 0 26px 52px;\r\n  counter-increment: ly-step;\r\n}\r\n\r\n.leeyee-ats-ups-timeline li:last-child {\r\n  padding-bottom: 0;\r\n}\r\n\r\n.leeyee-ats-ups-timeline li::before {\r\n  content: counter(ly-step);\r\n  position: absolute;\r\n  top: 0;\r\n  left: 0;\r\n  width: 34px;\r\n  height: 34px;\r\n  border-radius: 50%;\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  font-size: 15px;\r\n  line-height: 34px;\r\n  text-align: center;\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-ats-ups-timeline li::after {\r\n  content: \"\";\r\n  position: absolute;\r\n  top: 37px;\r\n  bottom: 4px;\r\n  left: 16px;\r\n  width: 2px;\r\n  background: #d8e4ed;\r\n}\r\n\r\n.leeyee-ats-ups-timeline li:last-child::after {\r\n  display: none;\r\n}\r\n\r\n.leeyee-ats-ups-timeline strong {\r\n  display: block;\r\n  margin-bottom: 3px;\r\n}\r\n\r\n\/* Architecture *\/\r\n.leeyee-ats-ups-architecture {\r\n  margin: 24px 0;\r\n  padding: 21px 22px;\r\n  background: #fff;\r\n  border: 1px solid var(--ly-border);\r\n  border-radius: 8px;\r\n}\r\n\r\n.leeyee-ats-ups-architecture h3 {\r\n  margin: 0 0 11px;\r\n  font-size: 21px;\r\n}\r\n\r\n.leeyee-ats-ups-path {\r\n  margin: 13px 0 15px;\r\n  padding: 11px 13px;\r\n  overflow-wrap: anywhere;\r\n  background: var(--ly-blue-xpale);\r\n  border-radius: 5px;\r\n  color: #334655;\r\n  font-family: Consolas, Monaco, \"Courier New\", monospace;\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n\/* Checklist *\/\r\n.leeyee-ats-ups-checklist {\r\n  margin: 28px 0;\r\n  padding: 24px;\r\n  background: var(--ly-blue-pale);\r\n  border: 1px 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0;\r\n  padding: 12px 24px;\r\n  border: 1px solid #004898;\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: #004898;\r\n  box-shadow: 0 4px 12px rgba(0, 72, 152, .10);\r\n  font-family: inherit;\r\n  font-size: 16px;\r\n  font-weight: 700;\r\n  line-height: 1.2;\r\n  text-align: center;\r\n  cursor: pointer;\r\n  appearance: none;\r\n  -webkit-appearance: none;\r\n  transition:\r\n    background-color .2s ease,\r\n    border-color .2s ease,\r\n    color .2s ease,\r\n    transform .2s ease,\r\n    box-shadow .2s ease;\r\n}\r\n\r\n.leeyee-ats-ups .leeyee-about-btn-light:hover {\r\n  background: #004898;\r\n  border-color: #004898;\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 6px 16px rgba(0, 72, 152, .16);\r\n}\r\n\r\n.leeyee-ats-ups .leeyee-about-btn-light:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, .25);\r\n  outline-offset: 3px;\r\n}\r\n\r\n.leeyee-ats-ups .leeyee-about-btn-light:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n\/* FAQ *\/\r\n.leeyee-ats-ups-faq {\r\n  margin-top: 22px;\r\n  border-top: 1px solid var(--ly-border);\r\n}\r\n\r\n.leeyee-ats-ups-faq-item {\r\n  padding: 20px 0;\r\n  border-bottom: 1px solid var(--ly-border);\r\n}\r\n\r\n.leeyee-ats-ups-faq-item h3 {\r\n  margin: 0 0 8px;\r\n  font-size: 20px;\r\n}\r\n\r\n.leeyee-ats-ups-faq-item p {\r\n  margin: 0;\r\n}\r\n\r\n\/* References *\/\r\n.leeyee-ats-ups-references {\r\n  margin: 18px 0 0;\r\n  padding-left: 22px;\r\n  color: #4b5b69;\r\n  font-size: 14px;\r\n  line-height: 1.65;\r\n}\r\n\r\n.leeyee-ats-ups-references li {\r\n  margin: 9px 0;\r\n}\r\n\r\n.leeyee-ats-ups-references a {\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n\/* Responsive *\/\r\n@media (max-width: 820px) {\r\n  .leeyee-ats-ups-summary {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .leeyee-ats-ups-summary-item {\r\n    border-right: 0;\r\n    border-bottom: 1px solid var(--ly-border);\r\n  }\r\n\r\n  .leeyee-ats-ups-summary-item:last-child {\r\n    border-bottom: 0;\r\n  }\r\n}\r\n\r\n@media (max-width: 768px) {\r\n  .leeyee-ats-ups {\r\n    padding: 5px 18px 42px;\r\n    font-size: 16px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  .leeyee-ats-ups h2 {\r\n    margin-top: 43px;\r\n    font-size: 27px;\r\n  }\r\n\r\n  .leeyee-ats-ups h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  .leeyee-ats-ups-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .leeyee-ats-ups-quick,\r\n  .leeyee-ats-ups-note,\r\n  .leeyee-ats-ups-warning,\r\n  .leeyee-ats-ups-checklist,\r\n  .leeyee-ats-ups-cta,\r\n  .leeyee-ats-ups-architecture {\r\n    padding: 19px;\r\n  }\r\n\r\n  .leeyee-ats-ups-check-grid {\r\n    grid-template-columns: 1fr;\r\n    gap: 2px;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  .leeyee-ats-ups-table {\r\n    min-width: 570px;\r\n  }\r\n\r\n  .leeyee-ats-ups-figure {\r\n    margin-top: 24px;\r\n    margin-bottom: 30px;\r\n  }\r\n}\r\n\r\n@media (max-width: 480px) {\r\n  .leeyee-ats-ups {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n  }\r\n\r\n  .leeyee-ats-ups h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  .leeyee-ats-ups h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .leeyee-ats-ups-quick,\r\n  .leeyee-ats-ups-note,\r\n  .leeyee-ats-ups-warning,\r\n  .leeyee-ats-ups-checklist,\r\n  .leeyee-ats-ups-cta,\r\n  .leeyee-ats-ups-architecture {\r\n    padding: 17px;\r\n  }\r\n\r\n  .leeyee-ats-ups .leeyee-about-btn-light {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding-left: 16px;\r\n    padding-right: 16px;\r\n  }\r\n\r\n  .leeyee-ats-ups-table th,\r\n  .leeyee-ats-ups-table td {\r\n    padding: 11px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-ats-ups\">\r\n\r\n  <p class=\"leeyee-ats-ups-intro\">\r\n    An automatic transfer switch and a UPS solve different parts of the same critical-power problem. The ATS selects between available power sources. The UPS keeps supported critical loads powered while the upstream source is lost, changing or recovering. In a generator-backed system, reliable continuity depends on coordinating the <strong>ATS transition method, UPS topology, generator start and stabilisation sequence, bypass state and permitted load interruption<\/strong> rather than selecting each device independently.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-ats-ups-quick\">\r\n    <span class=\"leeyee-ats-ups-label\">Quick Answer<\/span>\r\n    <p>\r\n      <strong>An ATS is not a UPS.<\/strong> A standard open-transition ATS uses break-before-make transfer, so the electrical path through the ATS is interrupted while moving from one source to another. A suitable downstream UPS can bridge this upstream interruption and support a critical load while a standby generator starts and becomes acceptable. Whether the load actually remains uninterrupted depends on UPS topology, battery autonomy, operating mode, bypass condition, generator behaviour and the complete system architecture. [1][2][3]\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-ats-ups-summary\">\r\n    <div class=\"leeyee-ats-ups-summary-item\">\r\n      <strong>ATS<\/strong>\r\n      <span>Selects which acceptable AC source feeds the downstream system.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-ats-ups-summary-item\">\r\n      <strong>UPS<\/strong>\r\n      <span>Provides ride-through and conditioned power according to its topology and operating state.<\/span>\r\n    <\/div>\r\n    <div class=\"leeyee-ats-ups-summary-item\">\r\n      <strong>Generator<\/strong>\r\n      <span>Provides longer-duration standby power after starting and reaching acceptable conditions.<\/span>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <figure class=\"leeyee-ats-ups-figure leeyee-ats-ups-figure--mask-logo\">\r\n    <div class=\"leeyee-ats-ups-image-mask-wrap\">\r\n      <img\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-ups-generator-critical-load-coordination-diagram.webp\"\r\n        alt=\"ATS and UPS coordination diagram showing utility, generator, automatic transfer switch, UPS, and critical load\"\r\n        loading=\"eager\"\r\n        decoding=\"async\">\r\n    <\/div>\r\n    <figcaption>\r\n      A common ATS and UPS coordination concept: the ATS changes the upstream source while the UPS supports the critical load during source loss, generator startup and transfer.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/ats-ups-coordination-guide\/#ats-vs-ups-what-does-each-device-actually-do\" >ATS vs UPS: What Does Each Device Actually Do?<\/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\/pt\/ats-ups-coordination-guide\/#why-does-an-open-transition-ats-create-a-power-gap\" >Why Does an Open-Transition ATS Create a Power Gap?<\/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\/pt\/ats-ups-coordination-guide\/#what-actually-happens-after-utility-power-fails\" >What Actually Happens After Utility Power Fails?<\/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\/pt\/ats-ups-coordination-guide\/#should-the-ats-be-installed-before-or-after-the-ups\" >Should the ATS Be Installed Before or After the UPS?<\/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\/pt\/ats-ups-coordination-guide\/#where-does-the-leeyee-compact-ats-fit\" >Where Does the LEEYEE Compact ATS Fit?<\/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\/pt\/ats-ups-coordination-guide\/#why-does-generator-stability-matter-to-the-ups\" >Why Does Generator Stability Matter to the UPS?<\/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\/pt\/ats-ups-coordination-guide\/#what-is-the-real-ups-ride-through-requirement\" >What Is the Real UPS Ride-Through Requirement?<\/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\/pt\/ats-ups-coordination-guide\/#what-happens-when-utility-power-returns\" >What Happens When Utility Power Returns?<\/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\/pt\/ats-ups-coordination-guide\/#why-must-ups-bypass-be-included-in-the-review\" >Why Must UPS Bypass Be Included in the Review?<\/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\/pt\/ats-ups-coordination-guide\/#does-closed-transition-remove-the-need-for-a-ups\" >Does Closed Transition Remove the Need for a UPS?<\/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\/pt\/ats-ups-coordination-guide\/#which-status-and-alarm-signals-matter\" >Which Status and Alarm Signals Matter?<\/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\/pt\/ats-ups-coordination-guide\/#how-should-ats-ups-coordination-be-tested\" >How Should ATS + UPS Coordination Be Tested?<\/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\/pt\/ats-ups-coordination-guide\/#what-should-be-confirmed-before-ordering\" >What Should Be Confirmed Before Ordering?<\/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\/pt\/ats-ups-coordination-guide\/#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\/pt\/ats-ups-coordination-guide\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"ats-vs-ups-what-does-each-device-actually-do\"><\/span>ATS vs UPS: What Does Each Device Actually Do?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 covers transfer switching equipment used to transfer a load between power supply sources. Eaton likewise describes an ATS as a self-acting switching device that monitors the available sources and transfers the connected load according to its control logic. [1][2]\r\n  <\/p>\r\n\r\n  <p>\r\n    A UPS has a different job. It supports its downstream load when normal input power is disturbed or unavailable, according to the UPS topology, energy-storage system and operating state. It therefore provides a power bridge that an ordinary electromechanical ATS does not provide. [3]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-ats-ups-table-wrap\">\r\n    <table class=\"leeyee-ats-ups-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Equipment<\/th>\r\n          <th>Main Function<\/th>\r\n          <th>Stored-Energy Support<\/th>\r\n          <th>Role During Utility Failure<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td><strong>ATS<\/strong><\/td>\r\n          <td>Transfers the load between acceptable power sources<\/td>\r\n          <td>No<\/td>\r\n          <td>Selects the alternate source when transfer conditions are satisfied<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td><strong>UPS<\/strong><\/td>\r\n          <td>Maintains suitable power to supported critical loads<\/td>\r\n          <td>Yes, according to UPS design<\/td>\r\n          <td>Supports the load while upstream power is unavailable<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td><strong>Generator<\/strong><\/td>\r\n          <td>Provides longer-duration standby power<\/td>\r\n          <td>Fuel-based energy source<\/td>\r\n          <td>Starts, stabilises and then supplies the standby system<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"leeyee-ats-ups-table-conclusion\">\r\n    <strong>Buyer meaning:<\/strong> specifying only \u201cATS + UPS\u201d is not enough. The project must define which sources are being transferred, which loads require ride-through and what interruption those loads can tolerate.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-does-an-open-transition-ats-create-a-power-gap\"><\/span>Why Does an Open-Transition ATS Create a Power Gap?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Open transition is a <strong>break-before-make<\/strong> transfer method. The first source is disconnected before the second source is connected. Eaton describes this operating sequence in its ATS fundamentals guidance. [2]\r\n  <\/p>\r\n\r\n  <p>\r\n    That switching function is fundamentally different from stored-energy support. During the break in the upstream path, a sensitive electronic load needs another source of ride-through if even a short loss of supply is unacceptable.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-ats-ups-warning\">\r\n    <span class=\"leeyee-ats-ups-note-title\">Engineering meaning<\/span>\r\n    <p>\r\n      Do not describe an ordinary open-transition ATS as a \u201czero-break\u201d power device. If uninterrupted output is required at the critical load, continuity must be provided by the complete system architecture, such as an appropriately selected UPS, rather than by the open-transition ATS alone.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-actually-happens-after-utility-power-fails\"><\/span>What Actually Happens After Utility Power Fails?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"leeyee-ats-ups-timeline\">\r\n    <li>\r\n      <strong>The normal source becomes unacceptable.<\/strong>\r\n      The ATS or source-monitoring system detects loss of utility power or another condition outside the configured source-acceptance range. [2]\r\n    <\/li>\r\n    <li>\r\n      <strong>The UPS supports the critical load.<\/strong>\r\n      If the UPS is operating through a topology and power path that provides stored-energy ride-through, the downstream critical load continues operating while upstream power is unavailable. [3]\r\n    <\/li>\r\n    <li>\r\n      <strong>The standby generator starts.<\/strong>\r\n      The generator needs time to start and establish usable output. [4]\r\n    <\/li>\r\n    <li>\r\n      <strong>The emergency source reaches acceptable conditions.<\/strong>\r\n      Voltage and frequency must satisfy the applicable transfer-control criteria before the normal transfer sequence proceeds. [2][4]\r\n    <\/li>\r\n    <li>\r\n      <strong>The ATS transfers to the emergency source.<\/strong>\r\n      With open transition, the normal source is disconnected before the generator source is connected. [2]\r\n    <\/li>\r\n    <li>\r\n      <strong>The UPS accepts generator input.<\/strong>\r\n      The UPS has its own acceptable input-voltage and frequency range. If generator output remains outside that range, the UPS can remain on battery. [5]\r\n    <\/li>\r\n    <li>\r\n      <strong>The system enters recovery.<\/strong>\r\n      The generator must remain stable while the UPS returns toward its intended operating state and battery recharge is managed.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <figure class=\"leeyee-ats-ups-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/generator-backup-automatic-transfer-switch-system-diagram.webp\"\r\n      alt=\"Generator backup automatic transfer switch system diagram showing utility supply, generator, ATS, and downstream load\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      In a generator-backed ATS system, transfer is only one part of the recovery sequence. The generator must start and become an acceptable source before it can support the downstream system.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <figure class=\"leeyee-ats-ups-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-ups-transfer-timeline-ride-through-diagram.webp\"\r\n      alt=\"ATS UPS transfer timeline showing utility failure, UPS ride-through, generator startup, ATS transfer, and UPS recovery\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      The UPS ride-through requirement normally covers the complete source-recovery sequence. The ATS transfer interval is only one part of that sequence.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-ats-ups-warning\">\r\n    <span class=\"leeyee-ats-ups-note-title\">Do not size UPS ride-through from ATS transfer time alone<\/span>\r\n    <p>\r\n      A generator-backed UPS may need to support the critical load from loss of the normal source until the generator has started, stabilised, passed ATS source-acceptance logic and become an acceptable UPS input. Actual timing must come from the selected ATS, generator controller, UPS documentation and project sequence of operation.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"should-the-ats-be-installed-before-or-after-the-ups\"><\/span>Should the ATS Be Installed Before or After the UPS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-ats-ups-architecture\">\r\n    <h3>Architecture 1: ATS Upstream of the UPS<\/h3>\r\n    <div class=\"leeyee-ats-ups-path\">\r\n      Utility + Generator \u2192 ATS \u2192 UPS \u2192 Critical Load\r\n    <\/div>\r\n    <p>\r\n      This is a common concept for generator-backed critical electronic loads. The ATS selects the long-duration upstream source while the downstream UPS bridges the source-change interval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-ats-ups-architecture\">\r\n    <h3>Architecture 2: Transfer Between Two UPS Outputs<\/h3>\r\n    <div class=\"leeyee-ats-ups-path\">\r\n      UPS A + UPS B \u2192 Suitable Transfer Device \u2192 Single-Cord Critical Load\r\n    <\/div>\r\n    <p>\r\n      This is a different architecture. The transfer device selects between two conditioned sources rather than between utility and generator inputs. Model-specific source synchronisation and transfer requirements must be confirmed. [6]\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-ats-ups-note\">\r\n    <span class=\"leeyee-ats-ups-note-title\">Engineering meaning<\/span>\r\n    <p>\r\n      The question \u201cShould the ATS be before or after the UPS?\u201d cannot be answered safely from current rating alone. Review the single-line diagram, source arrangement, load type, redundancy concept and permitted interruption first.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-does-the-leeyee-compact-ats-fit\"><\/span>Where Does the LEEYEE Compact ATS Fit?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The LEEYEE product shown below is a compact automatic transfer switch intended to switch between two suitable AC sources in low-voltage backup-power applications. In this article, it should be understood as the <strong>source-transfer element<\/strong> of the architecture\u2014not as a UPS and not as a device that independently provides zero-interruption ride-through.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-ats-ups-figure leeyee-ats-ups-figure--product\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE compact 2P and 4P automatic transfer switches for normal and standby source transfer\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      LEEYEE compact 2P and 4P ATS models for normal and standby source transfer. Final project suitability must be confirmed against system voltage, rated current, pole configuration, neutral arrangement, short-circuit conditions and required transfer behaviour.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-ats-ups-architecture\">\r\n    <div class=\"leeyee-ats-ups-path\">\r\n      Utility + Generator \u2192 LEEYEE Compact ATS \u2192 UPS \u2192 Critical Load\r\n    <\/div>\r\n    <p>\r\n      The ATS performs the automatic source change. The UPS provides the ride-through needed by sensitive loads while the upstream source is unavailable or changing.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-ats-ups-warning leeyee-ats-ups-warning--risk\">\r\n    <span class=\"leeyee-ats-ups-note-title\">LEEYEE product boundary<\/span>\r\n    <p>\r\n      LEEYEE's current standard compact ATS offering is based on ordinary open-transition source transfer. Closed-transition systems, bypass\/isolation transfer equipment and maintenance-bypass assemblies are project-level extended solutions and must not be presented as standard built-in functions of the ordinary compact LEEYEE ATS.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-does-generator-stability-matter-to-the-ups\"><\/span>Why Does Generator Stability Matter to the UPS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A generator should not be treated as an acceptable UPS input simply because the engine has started.\r\n  <\/p>\r\n\r\n  <p>\r\n    Eaton notes that every UPS has an acceptable input voltage and frequency window. If generator output falls outside that window, the UPS can regard the generator as unstable and continue operating on battery. Generator sizing, governor performance and UPS topology also affect compatibility. [5]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-ats-ups-warning\">\r\n    <span class=\"leeyee-ats-ups-note-title\">Possible failure pattern<\/span>\r\n    <p>\r\n      If the generator is connected before it is sufficiently stable for the UPS and connected load, applying the load can further disturb voltage or frequency. Schneider Electric documents rack ATS scenarios in which unstable source conditions can contribute to repeated switching. [6] Actual behaviour depends on the selected equipment and project settings.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-is-the-real-ups-ride-through-requirement\"><\/span>What Is the Real UPS Ride-Through Requirement?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-ats-ups-note\">\r\n    <span class=\"leeyee-ats-ups-note-title\">Conceptual timing relationship<\/span>\r\n    <p>\r\n      Required UPS support period \u2248 generator start + source stabilisation and acceptance + ATS transfer sequence + UPS input acceptance + appropriate project margin.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    This is a conceptual relationship, not a universal sizing formula. No fixed seconds or milliseconds should be assumed without the selected generator controller, ATS controller, UPS specifications and project sequence of operation.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-happens-when-utility-power-returns\"><\/span>What Happens When Utility Power Returns?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Utility restoration does not necessarily mean that the ATS should immediately transfer back. The returning normal source first needs to satisfy the controller's return criteria and any configured retransfer delay.\r\n  <\/p>\r\n\r\n  <p>\r\n    Cummins describes transfer-switch control sequences in which a stable returning utility source initiates retransfer from generator back to utility. Generator shutdown can also include an unloaded cooldown period. Exact timing is controller- and project-specific. [4][7]\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-must-ups-bypass-be-included-in-the-review\"><\/span>Why Must UPS Bypass Be Included in the Review?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A continuity study should not consider only normal UPS inverter operation. When the UPS is on static bypass, or when an external maintenance bypass isolates the UPS, the critical load can be more directly exposed to upstream source behaviour.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-ats-ups-table-wrap\">\r\n    <table class=\"leeyee-ats-ups-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Operating State<\/th>\r\n          <th>Power Path<\/th>\r\n          <th>Main Question<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td><strong>UPS inverter active<\/strong><\/td>\r\n          <td>Load supplied through normal UPS conversion path<\/td>\r\n          <td>Can stored energy bridge the complete upstream event?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td><strong>UPS static bypass<\/strong><\/td>\r\n          <td>Load supplied through the bypass path<\/td>\r\n          <td>Will the upstream transfer reach the load?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td><strong>Maintenance bypass active<\/strong><\/td>\r\n          <td>UPS may be removed from the load path<\/td>\r\n          <td>Can the remaining system meet the continuity requirement?<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-closed-transition-remove-the-need-for-a-ups\"><\/span>Does Closed Transition Remove the Need for a UPS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    No. Closed transition changes the transfer method between suitable sources. It does not provide stored-energy backup if both upstream sources are unavailable. A UPS can therefore still be required for critical loads. [1][2]\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-status-and-alarm-signals-matter\"><\/span>Which Status and Alarm Signals Matter?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-ats-ups-table-wrap\">\r\n    <table class=\"leeyee-ats-ups-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Status<\/th>\r\n          <th>Why It Matters<\/th>\r\n          <th>Typical Source<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Normal source available<\/td>\r\n          <td>Shows whether the preferred source satisfies the configured criteria<\/td>\r\n          <td>ATS \/ source monitor<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Emergency source available<\/td>\r\n          <td>Shows whether the alternate source is ready<\/td>\r\n          <td>ATS \/ generator controller<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Load on normal \/ emergency<\/td>\r\n          <td>Identifies the active source<\/td>\r\n          <td>ATS<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>UPS on battery<\/td>\r\n          <td>Shows stored-energy operation<\/td>\r\n          <td>UPS<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>UPS on bypass<\/td>\r\n          <td>Shows the normal inverter path is not active<\/td>\r\n          <td>UPS<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Generator running \/ alarm<\/td>\r\n          <td>Shows standby-source status<\/td>\r\n          <td>Generator controller<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"leeyee-ats-ups-table-conclusion\">\r\n    Actual dry contacts, communication functions and alarms must be confirmed against the selected equipment. Do not assume every compact ATS provides every signal listed above.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-should-ats-ups-coordination-be-tested\"><\/span>How Should ATS + UPS Coordination Be Tested?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Individual generator, ATS and UPS tests do not by themselves prove that the complete system will coordinate correctly. Integrated testing should reproduce the relevant operating sequence under controlled project conditions.\r\n  <\/p>\r\n\r\n  <ol class=\"leeyee-ats-ups-timeline\">\r\n    <li><strong>Simulate loss of normal power.<\/strong> Confirm source-failure detection.<\/li>\r\n    <li><strong>Verify UPS ride-through.<\/strong> Confirm the intended critical load remains supported.<\/li>\r\n    <li><strong>Verify generator startup.<\/strong> Confirm voltage and frequency become acceptable.<\/li>\r\n    <li><strong>Observe ATS transfer.<\/strong> Check the intended transfer sequence and watch for repeated source switching.<\/li>\r\n    <li><strong>Confirm UPS accepts generator input.<\/strong> Verify the UPS returns from stored-energy operation as intended.<\/li>\r\n    <li><strong>Verify alarms and remote status.<\/strong> Check required ATS, UPS and generator signals.<\/li>\r\n    <li><strong>Restore utility and test retransfer.<\/strong> Confirm transfer-back and generator cooldown behaviour follow the approved project sequence. [7]<\/li>\r\n  <\/ol>\r\n\r\n  <div class=\"leeyee-ats-ups-warning\">\r\n    <span class=\"leeyee-ats-ups-note-title\">Commissioning boundary<\/span>\r\n    <p>\r\n      Final test procedures, load levels and pass\/fail criteria must follow the project specification, applicable standards and instructions for the selected ATS, UPS, generator and protection equipment.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-be-confirmed-before-ordering\"><\/span>What Should Be Confirmed Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-ats-ups-checklist\">\r\n    <div class=\"leeyee-ats-ups-checklist-title\">\r\n      ATS + UPS Project Confirmation Checklist\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-ats-ups-check-grid\">\r\n      <div class=\"leeyee-ats-ups-check\">Single-line diagram<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Normal and emergency source types<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">System voltage and frequency<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Single-phase or three-phase system<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">ATS current rating<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Required pole configuration<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Neutral switching requirement<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">UPS topology<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">UPS rated kVA \/ kW<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Actual supported load<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Required battery autonomy<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Maximum permitted interruption<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Generator rating and controller<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Generator start sequence<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">UPS generator-input limits<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">UPS static-bypass arrangement<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Maintenance-bypass arrangement<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Required status and alarm signals<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Available fault-current data<\/div>\r\n      <div class=\"leeyee-ats-ups-check\">Applicable standards and certifications<\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-ats-ups-cta\">\r\n    <h3>Need to Confirm an ATS for a UPS-Backed System?<\/h3>\r\n    <p>\r\n      Send your single-line diagram, system voltage, load current, UPS topology, generator information and permitted interruption. LEEYEE can review whether a standard compact open-transition ATS matches the intended source-transfer function before model confirmation.\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 System Review\">\r\n      <span class=\"w-btn-label\">Request ATS System 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=\"leeyee-ats-ups-faq\">\r\n\r\n    <div class=\"leeyee-ats-ups-faq-item\">\r\n      <h3>Can an ATS replace a UPS?<\/h3>\r\n      <p>No. The ATS transfers between power sources, while the UPS provides stored-energy support according to its topology. [1][3]\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-ats-ups-faq-item\">\r\n      <h3>Can a UPS bridge an open-transition ATS transfer?<\/h3>\r\n      <p>Yes, if the selected UPS topology, operating state and battery autonomy can support the load through the complete upstream interruption.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-ats-ups-faq-item\">\r\n      <h3>Should the ATS be before or after the UPS?<\/h3>\r\n      <p>Utility-to-generator systems commonly place the ATS upstream of the UPS, but the final location must follow the project's single-line diagram and continuity objective.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-ats-ups-faq-item\">\r\n      <h3>Why might a UPS reject generator power?<\/h3>\r\n      <p>A UPS has acceptable input voltage and frequency limits. Generator output outside that range can prevent the UPS from accepting the source. [5]\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-ats-ups-faq-item\">\r\n      <h3>Does closed-transition ATS eliminate the need for a UPS?<\/h3>\r\n      <p>No. Closed transition changes the source-transfer method but does not provide stored-energy backup if both sources fail. [1][2]\r\n    <\/div>\r\n\r\n    <div class=\"leeyee-ats-ups-faq-item\">\r\n      <h3>Is bypass isolation a standard feature of this LEEYEE compact ATS?<\/h3>\r\n      <p>No. The standard compact LEEYEE ATS shown on this page is treated as an ordinary open-transition source-transfer device. Bypass-isolation and maintenance-bypass systems are separate engineered solutions.<\/p>\r\n    <\/div>\r\n\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=\"leeyee-ats-ups-references\">\r\n    <li>\r\n      International Electrotechnical Commission (IEC). <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment.<\/em>\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">IEC publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li>\r\n      Eaton. <em>Fundamentals of Automatic Transfer Switches (ATS).<\/em>\r\n      <a href=\"https:\/\/www.eaton.com\/us\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton ATS fundamentals<\/a>.\r\n    <\/li>\r\n\r\n    <li>\r\n      Schneider Electric. <em>What is the transfer time of APC Smart-UPS and Symmetra Units?<\/em> FAQ000268416.\r\n      <a href=\"https:\/\/www.se.com\/uk\/en\/faqs\/FAQ000268416\/\" target=\"_blank\" rel=\"noopener noreferrer\">Schneider Electric UPS transfer-time FAQ<\/a>.\r\n    <\/li>\r\n\r\n    <li>\r\n      Cummins. <em>GTEC Transfer Switch.<\/em>\r\n      <a href=\"https:\/\/www.cummins.com\/en-in\/generators\/products\/transfer-switches\/gtec-transfer-switch\" target=\"_blank\" rel=\"noopener noreferrer\">Cummins transfer-switch information<\/a>.\r\n    <\/li>\r\n\r\n    <li>\r\n      Eaton. <em>UPS for Generators: Six Considerations to Achieving Generator-UPS Harmony.<\/em>\r\n      <a href=\"https:\/\/www.eaton.com\/us\/en-us\/products\/backup-power-ups-surge-it-power-distribution\/backup-power-ups\/six-considerations-to-achieving-generator-ups-harmony.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton generator-UPS guidance<\/a>.\r\n    <\/li>\r\n\r\n    <li>\r\n      Schneider Electric \/ APC. <em>Common Rack Automatic Transfer Switch Scenarios and Questions.<\/em> FA156201.\r\n      <a href=\"https:\/\/www.se.com\/uk\/en\/faqs\/FA156201\/\" target=\"_blank\" rel=\"noopener noreferrer\">Schneider Electric Rack ATS technical FAQ<\/a>.\r\n    <\/li>\r\n\r\n    <li>\r\n      Cummins Power Generation. <em>Transfer Switch Application Manual.<\/em>\r\n      <a href=\"https:\/\/www.cummins.com\/sites\/default\/files\/2024-08\/t011-Transfer-switch-application-manual.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Cummins Transfer Switch Application Manual<\/a>.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <script>\r\n  document.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>\r\n\r\n<\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>An automatic transfer switch and a UPS solve different parts of the same critical-power problem. The ATS selects between available power sources. The UPS keeps supported critical loads powered while the upstream source is lost, changing or recovering. In a generator-backed system, reliable continuity depends on coordinating the ATS transition method, UPS topology, generator start&#8230;<\/p>","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-31670","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 and UPS Coordination Guide: Generator, Transfer &amp; Critical Loads<\/title>\n<meta name=\"description\" content=\"Learn how ATS, UPS and generator systems coordinate for critical loads, including open-transition ride-through, generator startup, UPS topology, bypass operation, testing and LEEYEE compact ATS selection.\" \/>\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\/pt\/ats-ups-coordination-guide\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATS and UPS Coordination Guide: Generator, Transfer &amp; Critical Loads\" \/>\n<meta property=\"og:description\" content=\"Learn how ATS, UPS and generator systems coordinate for critical loads, including open-transition ride-through, generator startup, UPS topology, bypass operation, testing and LEEYEE compact ATS selection.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/pt\/ats-ups-coordination-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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