{"id":31603,"date":"2026-10-10T13:25:07","date_gmt":"2026-10-10T05:25:07","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31603"},"modified":"2026-10-10T13:30:35","modified_gmt":"2026-10-10T05:30:35","slug":"automatic-transfer-switch-for-ev-charging-stations-compact-ac-backup-power-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/it\/ev-charging-station-automatic-transfer-switch\/","title":{"rendered":"Automatic Transfer Switch for EV Charging Stations: Compact AC Backup Power Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31603\" class=\"elementor elementor-31603\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8735c37 e-flex e-con-boxed e-con e-parent\" data-id=\"8735c37\" 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-def4806 elementor-widget elementor-widget-html\" data-id=\"def4806\" 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.leeyee-ev-ats-article{\r\n  --ly-blue:#004898;\r\n  --ly-blue-pale:#f7fbff;\r\n  --ly-text:#263746;\r\n  --ly-heading:#142b3c;\r\n  --ly-muted:#5f7080;\r\n  --ly-border:#d7e2ea;\r\n  --ly-warning:#9b451e;\r\n  --ly-warning-bg:#fff8f2;\r\n\r\n  width:100%;\r\n  max-width:860px;\r\n  margin:0 auto;\r\n  padding:8px 20px 56px;\r\n  box-sizing:border-box;\r\n  color:var(--ly-text);\r\n  font-family:inherit;\r\n  font-size:16.5px;\r\n  line-height:1.72;\r\n  overflow-wrap:anywhere;\r\n}\r\n\r\n.leeyee-ev-ats-article *,\r\n.leeyee-ev-ats-article *::before,\r\n.leeyee-ev-ats-article *::after{\r\n  box-sizing:border-box;\r\n}\r\n\r\n.leeyee-ev-ats-article p{\r\n  margin:0 0 17px;\r\n}\r\n\r\n.leeyee-ev-ats-article strong{\r\n  color:var(--ly-heading);\r\n  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.ly-table-note{\r\n  margin:8px 0 24px;\r\n  color:var(--ly-muted);\r\n  font-size:14.5px;\r\n}\r\n\r\n\/* Images *\/\r\n.leeyee-ev-ats-article figure{\r\n  width:100%;\r\n  max-width:100%;\r\n  margin:28px auto 34px;\r\n  padding:0;\r\n  text-align:center;\r\n}\r\n\r\n.leeyee-ev-ats-article .ly-wide-figure{\r\n  width:100%;\r\n  max-width:860px;\r\n  margin:28px auto 34px;\r\n}\r\n\r\n.leeyee-ev-ats-article .ly-product-figure{\r\n  width:100%;\r\n  max-width:640px;\r\n  margin:28px auto 34px;\r\n}\r\n\r\n.leeyee-ev-ats-article figure img{\r\n  display:block;\r\n  width:100%;\r\n  max-width:100%;\r\n  height:auto;\r\n  margin:0 auto;\r\n  padding:0;\r\n  object-fit:contain;\r\n  background:#fff;\r\n  border:1px solid #dce5eb;\r\n  border-radius:10px;\r\n  box-shadow:none;\r\n}\r\n\r\n.leeyee-ev-ats-article .ly-wide-figure img{\r\n  aspect-ratio:4 \/ 3;\r\n}\r\n\r\n.leeyee-ev-ats-article .ly-product-figure img{\r\n  max-width:640px;\r\n  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padding-left:12px;\r\n    font-size:15.5px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-ev-ats-article\">\r\n\r\n  <span class=\"ly-kicker\">EV Charging Infrastructure \u00b7 ATS Selection Guide<\/span>\r\n\r\n  <p class=\"ly-intro\">\r\n    An automatic transfer switch can be useful at an EV charging station when a load needs to move automatically between two AC power sources.\r\n  <\/p>\r\n\r\n  <p>\r\n    For the compact LEEYEE ATS shown on this page, the best fit is normally a <strong>defined low-voltage AC circuit<\/strong>. That could be an auxiliary panel, control equipment or a selected charging branch.\r\n  <\/p>\r\n\r\n  <p>\r\n    It is <strong>not<\/strong> a DC fast-charging output switch. It should not be installed between a charger's DC power module and the vehicle.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <section class=\"ly-quick\" aria-labelledby=\"quick-answer\">\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\/it\/ev-charging-station-automatic-transfer-switch\/#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\/it\/ev-charging-station-automatic-transfer-switch\/#where-does-the-ats-go\" >Where Does the ATS Go?<\/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\/it\/ev-charging-station-automatic-transfer-switch\/#which-loads-should-be-backed-up\" >Which Loads Should Be Backed Up?<\/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\/it\/ev-charging-station-automatic-transfer-switch\/#generator-bess-or-second-ac-source\" >Generator, BESS or Second AC Source?<\/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\/it\/ev-charging-station-automatic-transfer-switch\/#how-do-you-choose-current-and-poles\" >How Do You Choose Current and Poles?<\/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\/it\/ev-charging-station-automatic-transfer-switch\/#what-can-the-leeyee-compact-ats-do\" >What Can the LEEYEE Compact ATS Do?<\/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\/it\/ev-charging-station-automatic-transfer-switch\/#what-should-you-send-before-ordering\" >What Should You Send Before Ordering?<\/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\/it\/ev-charging-station-automatic-transfer-switch\/#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-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ev-charging-station-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer\"><\/span>Quick Answer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p class=\"ly-answer\">\r\n      <strong>Put the ATS on the AC supply side, before the charger converts power for the vehicle.<\/strong>\r\n    <\/p>\r\n\r\n    <p>\r\n      Typical source combinations are utility + generator, utility + a suitable PCS AC backup output, or two AC supplies.\r\n    <\/p>\r\n\r\n    <p>\r\n      Before choosing the ATS, first decide <strong>what actually needs backup<\/strong>. Do not size it from the total charging-station kW alone.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Application<\/th>\r\n          <th>Fit<\/th>\r\n          <th>Buyer Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Utility \u2194 generator for auxiliary loads<\/td>\r\n          <td class=\"ly-yes\">Good fit<\/td>\r\n          <td>Typical compact ATS application.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Selected EV charger branch<\/td>\r\n          <td class=\"ly-check\">Check first<\/td>\r\n          <td>Confirm real AC current and protection.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Utility \u2194 PCS backup AC<\/td>\r\n          <td class=\"ly-check\">Project check<\/td>\r\n          <td>Confirm PCS and EMS operating logic.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Whole high-power charging station<\/td>\r\n          <td class=\"ly-check\">Do not assume<\/td>\r\n          <td>May exceed compact ATS scope.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>DC charger output \u2194 EV<\/td>\r\n          <td class=\"ly-no\">No<\/td>\r\n          <td>Not the function of this AC ATS.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    Start with the circuit that needs backup, not the total advertised power of the charging station.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-wide-figure\">\r\n    <img fetchpriority=\"high\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ev-charging-station-ats-system-diagram.webp\"\r\n      alt=\"EV charging station ATS system diagram showing utility, backup AC source, ATS, distribution board and EV charger\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      decoding=\"async\"\r\n      fetchpriority=\"high\">\r\n    <figcaption>\r\n      The ATS sits on the AC supply side. It transfers power before the charger power-conversion stage.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-does-the-ats-go\"><\/span>Where Does the ATS Go?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    EV charging equipment can contain both AC and DC sections.<sup><a href=\"#ref-1\">[1]<\/a><\/sup> That is why the first step is to separate the two clearly.\r\n  <\/p>\r\n\r\n  <p>\r\n    The LEEYEE ATS belongs on the <strong>low-voltage AC side<\/strong>. It transfers an AC load between two AC sources.\r\n  <\/p>\r\n\r\n  <p>\r\n    After that, the EV charger handles its own charging control and power conversion.\r\n  <\/p>\r\n\r\n  <div class=\"ly-keyline\">\r\n    <p>\r\n      <strong>Simple rule:<\/strong> ATS before the charger power-conversion stage = possible. ATS between the DC charger output and the EV = not this product's job.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-wide-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/correct-incorrect-ats-position-ev-charging.webp\"\r\n      alt=\"Correct and incorrect ATS positions in an EV charging station with AC-side transfer and DC-side misuse\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      The correct position is on the AC supply side. A normal AC ATS should not be used as the charger-to-vehicle DC output switch.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-loads-should-be-backed-up\"><\/span>Which Loads Should Be Backed Up?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    This decision matters more than the total charger rating.\r\n  <\/p>\r\n\r\n  <p>\r\n    A charging station may have a large installed capacity but only need a small part of the site to stay powered during an outage.\r\n  <\/p>\r\n\r\n  <h3>1. Auxiliary Loads<\/h3>\r\n\r\n  <p>\r\n    These may include control systems, communication equipment, network devices, monitoring, payment equipment, lighting and access control.\r\n  <\/p>\r\n\r\n  <p>\r\n    For a compact ATS, this is often the most practical backup scenario.\r\n  <\/p>\r\n\r\n  <h3>2. Selected Chargers<\/h3>\r\n\r\n  <p>\r\n    Some projects keep only one or several chargers available during an outage.\r\n  <\/p>\r\n\r\n  <p>\r\n    In this case, size the ATS from the <strong>actual AC current of the selected backup circuit<\/strong>, not from the total installed charger power.\r\n  <\/p>\r\n\r\n  <h3>3. Full Charging Bank<\/h3>\r\n\r\n  <p>\r\n    Backing up the whole charging station is a different level of project.\r\n  <\/p>\r\n\r\n  <p>\r\n    It can require much higher current, larger conductors, stronger protection coordination and larger transfer equipment.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Do not assume a compact LEEYEE ATS can serve as the main transfer switch for every high-power charging station.<\/strong> Check the actual circuit and project ratings first.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-wide-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ev-charging-station-backup-load-selection.webp\"\r\n      alt=\"EV charging station backup load selection showing auxiliary loads, selected chargers and full charging bank\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Decide what must stay powered first. That decision directly affects the ATS and backup-source size.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"generator-bess-or-second-ac-source\"><\/span>Generator, BESS or Second AC Source?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Utility + Generator<\/h3>\r\n\r\n  <p>\r\n    This is a common ATS arrangement.\r\n  <\/p>\r\n\r\n  <p>\r\n    When utility power fails, the system can start the generator. Once the backup source is ready, the ATS transfers the selected AC load.\r\n  <\/p>\r\n\r\n  <p>\r\n    The important point is simple: <strong>the generator only needs to supply the loads you decide to keep running.<\/strong>\r\n  <\/p>\r\n\r\n  <h3>Utility + BESS \/ PCS<\/h3>\r\n\r\n  <p>\r\n    A BESS can also provide backup power if its PCS provides a suitable AC output.\r\n  <\/p>\r\n\r\n  <p>\r\n    But this needs more checking than a basic utility-generator system.\r\n  <\/p>\r\n\r\n  <p>\r\n    Confirm how the PCS works during an outage, how it handles island operation, how neutral and earthing are arranged, and how the EMS controls the system.\r\n  <\/p>\r\n\r\n  <div class=\"ly-engineering-note\">\r\n    <span class=\"ly-note-title\">What to send us<\/span>\r\n    <p>\r\n      For a BESS project, send the single-line diagram and PCS backup-output information. Battery kWh alone is not enough to select the ATS.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>Two AC Sources<\/h3>\r\n\r\n  <p>\r\n    An ATS can also transfer a load between two compatible AC sources.\r\n  <\/p>\r\n\r\n  <p>\r\n    Both sources still need to match the project voltage, frequency, protection and ATS requirements.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-do-you-choose-current-and-poles\"><\/span>How Do You Choose Current and Poles?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Do not start from a phrase such as \u201c120 kW charger\u201d or \u201c500 kW station.\u201d\r\n  <\/p>\r\n\r\n  <p>\r\n    Start from the <strong>AC circuit that will actually pass through the ATS<\/strong>.\r\n  <\/p>\r\n\r\n  <ol class=\"ly-steps\">\r\n    <li><strong>Choose the backup load.<\/strong> Auxiliary panel, selected chargers or another defined circuit.<\/li>\r\n    <li><strong>Confirm the AC system.<\/strong> Voltage, frequency and phase arrangement.<\/li>\r\n    <li><strong>Find the real maximum current.<\/strong> Use the project load data and charger AC input information.<\/li>\r\n    <li><strong>Check the backup source.<\/strong> Generator, PCS or second AC supply.<\/li>\r\n    <li><strong>Check protection.<\/strong> Upstream protection and short-circuit conditions matter.<\/li>\r\n    <li><strong>Match the LEEYEE model.<\/strong> Confirm current, poles and required control functions.<\/li>\r\n  <\/ol>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Current alone is not enough.<\/strong> A calculated load current below the ATS rating does not automatically mean the application is suitable. Protection and short-circuit conditions still need to be checked.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>3P or 4P?<\/h3>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>ATS<\/th>\r\n          <th>What It Switches<\/th>\r\n          <th>Main Question<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>3P<\/td>\r\n          <td>L1 \/ L2 \/ L3<\/td>\r\n          <td>Should neutral remain connected?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>4P<\/td>\r\n          <td>L1 \/ L2 \/ L3 \/ N<\/td>\r\n          <td>Does neutral also need to transfer?<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    Do not choose 3P or 4P from charger power alone.\r\n  <\/p>\r\n\r\n  <p>\r\n    Check the earthing system, neutral arrangement and the generator or PCS design first.<sup><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-can-the-leeyee-compact-ats-do\"><\/span>What Can the LEEYEE Compact ATS Do?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The product shown below is a <strong>compact integrated automatic transfer switch<\/strong> for low-voltage AC source transfer.\r\n  <\/p>\r\n\r\n  <p>\r\n    It is designed around normal open-transition operation. One source is disconnected before the other source is connected.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    This means there is a short power interruption during transfer.\r\n  <\/p>\r\n\r\n  <p>\r\n    The EV charger or control equipment must be able to accept that interruption and restart correctly.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-product-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/3.png\"\r\n      alt=\"LEEYEE compact 2 pole and 4 pole automatic transfer switches with Auto and Manual operating modes\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Actual LEEYEE compact ATS product. Final current rating, pole configuration and application suitability must be checked for the specific project.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-keyline\">\r\n    <p>\r\n      <strong>Product boundary:<\/strong> this page is about compact open-transition ATS applications. It is not presenting the product as a closed-transition system, bypass-isolation ATS or large EV charging switchgear.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>ATS and EMS Do Different Jobs<\/h3>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>System<\/th>\r\n          <th>Main Job<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>ATS<\/td>\r\n          <td>Transfer the AC load between two sources.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>EV charger controller<\/td>\r\n          <td>Control the charging equipment and charging process.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>EMS<\/td>\r\n          <td>Manage power allocation and charging priority.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Monitoring \/ SCADA<\/td>\r\n          <td>Receive operating status and alarms.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    Depending on the selected ATS model, a monitoring system may also receive signals such as:\r\n  <\/p>\r\n\r\n  <ul>\r\n    <li>Normal Source Available<\/li>\r\n    <li>Emergency Source Available<\/li>\r\n    <li>Load to Normal<\/li>\r\n    <li>Load to Emergency<\/li>\r\n    <li>Auto \/ Manual<\/li>\r\n    <li>Fault Alarm<\/li>\r\n  <\/ul>\r\n\r\n  <p>\r\n    If these signals are required, confirm the available auxiliary contacts and interface details for the exact LEEYEE model.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-you-send-before-ordering\"><\/span>What Should You Send Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A useful ATS recommendation needs more than the total charging-station power.\r\n  <\/p>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <h3>EV Charging ATS Checklist<\/h3>\r\n\r\n    <ul>\r\n      <li>Single-line diagram<\/li>\r\n      <li>Normal power source<\/li>\r\n      <li>Backup power source<\/li>\r\n      <li>System voltage<\/li>\r\n      <li>System frequency<\/li>\r\n      <li>Single-phase or three-phase<\/li>\r\n      <li>Loads that need backup<\/li>\r\n      <li>Maximum transferred current<\/li>\r\n      <li>Charger AC input data<\/li>\r\n      <li>2P \/ 3P \/ 4P requirement<\/li>\r\n      <li>Earthing system<\/li>\r\n      <li>Neutral arrangement<\/li>\r\n      <li>Upstream protection<\/li>\r\n      <li>Short-circuit information<\/li>\r\n      <li>Required status signals<\/li>\r\n      <li>Acceptable transfer interruption<\/li>\r\n      <li>Required certificates or documents<\/li>\r\n      <li>Quantity and OEM requirement<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <p>\r\n    The single-line diagram is especially useful. It shows the sources, ATS position, downstream loads and protection arrangement in one document.\r\n  <\/p>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Need to Check This ATS for Your EV Charging Project?<\/h3>\r\n\r\n    <p>\r\n      Send the single-line diagram, voltage, backup source, load current and pole requirement. LEEYEE can help check whether a compact open-transition ATS fits the application.\r\n    <\/p>\r\n\r\n    <button type=\"button\"\r\n            class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n            aria-label=\"Send Your EV Charging Single-Line Diagram\">\r\n      <span class=\"w-btn-label\">Send Your EV Charging Single-Line Diagram<\/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\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is a compact ATS suitable for an EV charging station?<\/h3>\r\n      <p>\r\n        Yes, when it is used on a suitable low-voltage AC circuit within the selected model's ratings. Auxiliary loads and selected charging branches are typical examples.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can the ATS switch between utility and a generator?<\/h3>\r\n      <p>\r\n        Yes. This is a common ATS application. The generator, load current, poles and protection still need to match the project.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can the ATS be installed on the DC fast-charging output?<\/h3>\r\n      <p>\r\n        No. The product shown here is for low-voltage AC source transfer, not for switching the charger-to-vehicle DC output.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can one compact ATS back up the whole charging station?<\/h3>\r\n      <p>\r\n        Only if the complete transferred circuit is within the selected model's verified ratings. Large high-power stations may need a different transfer-switch or switchgear solution.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Should I choose 3P or 4P?<\/h3>\r\n      <p>\r\n        Check whether the neutral needs to switch when the source changes. This depends on the earthing system and the generator or PCS design.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is open-transition transfer seamless?<\/h3>\r\n      <p>\r\n        No. Open transition disconnects the first source before connecting the second, so the load sees a brief interruption.<sup><a href=\"#ref-4\">[4]<\/a><\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <section class=\"ly-references\" aria-labelledby=\"references\">\r\n\r\n    <h2 id=\"references\"><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=\"ref-1\">\r\n        International Electrotechnical Commission (IEC), <em>IEC 61851-1:2017, Electric vehicle conductive charging system \u2013 Part 1: General requirements<\/em>, with Corrigendum 1:2023.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/33644\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-2\">\r\n        International Electrotechnical Commission (IEC), <em>IEC 60364-7-722:2018, Low-voltage electrical installations \u2013 Part 7-722: Requirements for special installations or locations \u2013 Supplies for electric vehicles<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29958\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-3\">\r\n        International Electrotechnical Commission (IEC), <em>IEC 60947-6-1:2026, 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\">IEC official publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-4\">\r\n        Eaton, <em>Automatic Transfer Switches (ATS) Fundamentals<\/em>, technical explanation of open-transition and closed-transition transfer modes.\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 resource<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-5\">\r\n        Schneider Electric \/ ASCO Power Technologies, <em>Neutral Configurations in Transfer Switches<\/em>.\r\n        <a href=\"https:\/\/www.se.com\/us\/en\/download\/document\/ASC-DB-NCTS\/\" target=\"_blank\" rel=\"noopener noreferrer\">Schneider Electric technical resource<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n\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>EV Charging Infrastructure \u00b7 ATS Selection Guide An automatic transfer switch can be useful at an EV charging station when a load needs to move automatically between two AC power sources. For the compact LEEYEE ATS shown on this page, the best fit is normally a defined low-voltage AC circuit. That could be an auxiliary&#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-31603","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>Automatic Transfer Switch for EV Charging Stations | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn where a compact automatic transfer switch fits in an EV charging station, which AC loads it can transfer, how to select backup circuits, poles and current, and where an ATS should not be used.\" \/>\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\/it\/ev-charging-station-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Automatic Transfer Switch for EV Charging Stations | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn where a compact automatic transfer switch fits in an EV charging station, which AC loads it can transfer, how to select backup circuits, poles and current, and where an ATS should not be used.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/it\/ev-charging-station-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-10T05:25:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-10T05:30:35+00:00\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ev-charging-station-automatic-transfer-switch\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ev-charging-station-automatic-transfer-switch\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"Automatic Transfer Switch for EV Charging Stations: Compact AC Backup Power Guide\",\"datePublished\":\"2026-10-10T05:25:07+00:00\",\"dateModified\":\"2026-10-10T05:30:35+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ev-charging-station-automatic-transfer-switch\\\/\"},\"wordCount\":1490,\"articleSection\":[\"Isolator &amp; 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