{"id":31556,"date":"2026-10-08T13:12:24","date_gmt":"2026-10-08T05:12:24","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31556"},"modified":"2026-10-08T13:13:02","modified_gmt":"2026-10-08T05:13:02","slug":"automatic-transfer-switch-for-cold-storage-and-refrigeration-systems","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/cold-storage-automatic-transfer-switch\/","title":{"rendered":"Automatic Transfer Switch for Cold Storage and Refrigeration Systems"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31556\" class=\"elementor elementor-31556\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b125a5f e-flex e-con-boxed e-con e-parent\" data-id=\"b125a5f\" 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-6958785 elementor-widget elementor-widget-html\" data-id=\"6958785\" 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}\r\n\r\n  #leeyee-cold-storage-ats-guide .leeyee-about-btn-light{\r\n    width:100%;\r\n    min-height:50px;\r\n    padding:12px 18px;\r\n  }\r\n}\r\n\r\n@media (max-width:430px){\r\n  #leeyee-cold-storage-ats-guide h2{\r\n    font-size:23px;\r\n  }\r\n\r\n  #leeyee-cold-storage-ats-guide .ly-quick,\r\n  #leeyee-cold-storage-ats-guide .ly-note,\r\n  #leeyee-cold-storage-ats-guide .ly-warning,\r\n  #leeyee-cold-storage-ats-guide .ly-checklist,\r\n  #leeyee-cold-storage-ats-guide .ly-cta,\r\n  #leeyee-cold-storage-ats-guide .ly-flow-answer,\r\n  #leeyee-cold-storage-ats-guide .ly-related{\r\n    padding:17px 15px;\r\n  }\r\n\r\n  #leeyee-cold-storage-ats-guide .ly-caption{\r\n    font-size:13.5px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-cold-storage-ats-guide\">\r\n\r\n  <p class=\"ly-intro\">\r\n    Selecting an automatic transfer switch for a cold-storage or refrigeration system is not simply a matter of matching an ATS ampere rating to the total refrigeration load. The correct selection depends on which circuits will transfer, whether compressor motors pass directly through the ATS, how the standby generator accepts those loads, the phase and neutral arrangement, and how much interruption the refrigeration system can tolerate.\r\n  <\/p>\r\n\r\n  <div class=\"ly-quick\">\r\n    <span class=\"ly-quick-label\">Quick Answer<\/span>\r\n    <p>\r\n      <strong>A compact open-transition automatic transfer switch can be used in many cold-storage backup-power architectures, but the ATS should be selected from the electrical system and transferred-load characteristics, not from cold-room size or compressor kW alone.<\/strong>\r\n    <\/p>\r\n    <p>\r\n      Before fixing the ATS model, confirm the transferred load list, continuous current, compressor starting method, generator capacity, phase and pole configuration, neutral arrangement, acceptable interruption and refrigeration restart sequence.\r\n    <\/p>\r\n    <p class=\"ly-answer-line\">\r\n      <strong>Most important:<\/strong> if the ATS directly switches compressor or other motor circuits, do not assume suitability from the ampere rating alone. The marked utilization category, motor-switching duty and project requirements must also be confirmed.<sup>[1][5]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-image\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/cold-storage-ats-backup-power-system-diagram.webp\"\r\n      alt=\"Cold storage automatic transfer switch backup power system diagram with utility supply generator and refrigeration loads\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      A typical cold-storage backup-power architecture: utility and generator feed the transfer system, while refrigeration controls determine how compressors, fans and other downstream loads restart.\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\/fr\/cold-storage-automatic-transfer-switch\/#what-actually-determines-ats-selection-in-a-cold-storage-project\" >What Actually Determines ATS Selection in a Cold-Storage Project?<\/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\/fr\/cold-storage-automatic-transfer-switch\/#cold-storage-loads-should-not-be-treated-as-one-identical-load\" >Cold-Storage Loads Should Not Be Treated as One Identical Load<\/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\/fr\/cold-storage-automatic-transfer-switch\/#can-an-automatic-transfer-switch-switch-a-refrigeration-compressor-directly\" >Can an Automatic Transfer Switch Switch a Refrigeration Compressor Directly?<\/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\/fr\/cold-storage-automatic-transfer-switch\/#ats-sizing-and-generator-sizing-are-related-but-not-identical\" >ATS Sizing and Generator Sizing Are Related but Not Identical<\/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\/fr\/cold-storage-automatic-transfer-switch\/#what-happens-when-utility-power-fails\" >What Happens When Utility Power Fails?<\/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\/fr\/cold-storage-automatic-transfer-switch\/#is-open-transition-ats-suitable-for-cold-storage\" >Is Open-Transition ATS Suitable for Cold Storage?<\/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\/fr\/cold-storage-automatic-transfer-switch\/#should-all-refrigeration-compressors-restart-at-the-same-time\" >Should All Refrigeration Compressors Restart at the Same Time?<\/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\/fr\/cold-storage-automatic-transfer-switch\/#how-to-select-an-ats-for-a-cold-storage-system\" >How to Select an ATS for a Cold-Storage System<\/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\/fr\/cold-storage-automatic-transfer-switch\/#why-delay-settings-matter-in-refrigeration-backup-power\" >Why Delay Settings Matter in Refrigeration Backup Power<\/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\/fr\/cold-storage-automatic-transfer-switch\/#common-cold-storage-ats-selection-mistakes\" >Common Cold-Storage ATS Selection Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/cold-storage-automatic-transfer-switch\/#information-to-prepare-before-ordering\" >Information to Prepare Before Ordering<\/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\/fr\/cold-storage-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-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/cold-storage-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-actually-determines-ats-selection-in-a-cold-storage-project\"><\/span>What Actually Determines ATS Selection in a Cold-Storage Project?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The first question is not \u201cHow large is the cold room?\u201d It is \u201cWhat electrical load will the automatic transfer switch actually carry?\u201d\r\n  <\/p>\r\n\r\n  <p>\r\n    A cold-storage installation may include compressor motors, condenser and evaporator fans, pumps, defrost heaters, refrigeration controllers, PLCs, alarms, monitoring equipment and lighting. These loads do not behave in the same way when utility power fails or when standby power becomes available.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Item to Confirm<\/th>\r\n          <th>Why It Matters<\/th>\r\n          <th>What the Buyer Should Provide<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Transferred loads<\/td>\r\n          <td>Defines what the ATS must continuously carry<\/td>\r\n          <td>Load schedule or circuit list<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Compressor motors<\/td>\r\n          <td>Motor starting and reconnection can create demanding electrical conditions<\/td>\r\n          <td>Motor current, power and starting method<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Generator<\/td>\r\n          <td>Must support steady running load and transient starting demand<\/td>\r\n          <td>Generator kW\/kVA, voltage and controller data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Phase and neutral<\/td>\r\n          <td>Affects pole selection and whether neutral switching needs evaluation<\/td>\r\n          <td>Single-line diagram and earthing arrangement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Interruption tolerance<\/td>\r\n          <td>Determines whether ordinary open-transition transfer is acceptable<\/td>\r\n          <td>Process and control-system requirements<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Restart sequence<\/td>\r\n          <td>Prevents assuming every refrigeration load should reconnect simultaneously<\/td>\r\n          <td>Refrigeration controller or PLC logic<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    <strong>Procurement conclusion:<\/strong> ATS selection should begin with the transferred-load architecture, not with a single compressor power figure.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-image\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/cold-storage-refrigeration-load-types-ats-selection.webp\"\r\n      alt=\"Cold storage refrigeration load types for ATS selection including compressors fans controllers heaters and auxiliary loads\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      Compressor motors, fans, controllers and auxiliary circuits have different electrical behavior and different backup priorities.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"cold-storage-loads-should-not-be-treated-as-one-identical-load\"><\/span>Cold-Storage Loads Should Not Be Treated as One Identical Load<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Compressor motors<\/h3>\r\n  <p>\r\n    Compressor motors are usually among the most important loads to evaluate. Motor-driven equipment can require substantially more power during starting than during normal running, and generator application guidance requires starting and transient demand to be considered separately from steady-state load.<sup>[4]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For engineering review, \u201c15 kW compressor\u201d alone is not enough. Useful information includes motor rated current, motor power, starting method, number of compressors and whether several motors can restart at the same time.\r\n  <\/p>\r\n\r\n  <h3>Evaporator and condenser fans<\/h3>\r\n  <p>\r\n    Fan motors may be smaller than the main compressor, but several fans can reconnect together. Their combined contribution should therefore appear in the load schedule and restart strategy.\r\n  <\/p>\r\n\r\n  <h3>Refrigeration controller, PLC and monitoring<\/h3>\r\n  <p>\r\n    Control and monitoring circuits may consume much less power than a compressor but can be operationally critical. If a controller, alarm or monitoring system cannot tolerate a short interruption, that continuity requirement must be addressed separately in the electrical design. An ordinary open-transition ATS is not an uninterruptible power supply.<sup>[2]<\/sup>\r\n  <\/p>\r\n\r\n  <h3>Defrost heaters and auxiliary loads<\/h3>\r\n  <p>\r\n    Defrost heaters are primarily resistive loads, while lighting and other auxiliary circuits may have different priorities. Depending on the project, non-critical loads may be delayed or excluded from emergency operation to reduce generator demand.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Do not size a cold-storage backup system from one total-kW figure.<\/strong> Generator application guidance distinguishes steady-state load from starting and transient requirements, and sequencing can reduce the amount of load applied at one time.<sup>[4]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"can-an-automatic-transfer-switch-switch-a-refrigeration-compressor-directly\"><\/span>Can an Automatic Transfer Switch Switch a Refrigeration Compressor Directly?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    It can only be confirmed after reviewing the actual transfer-switch rating and circuit arrangement. An ATS that is suitable for distribution or lightly inductive duty should not automatically be assumed suitable for direct compressor motor switching simply because its rated current is higher than the compressor running current.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 covers low-voltage transfer switching equipment and establishes requirements for transfer-switch performance and declared characteristics. Final application suitability must therefore be checked against the selected device documentation and the actual project duty.<sup>[1]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    Transfer-switch application guidance also treats motor switching as a specific duty because switching motors imposes different making and breaking conditions from ordinary non-inductive or lightly inductive loads.<sup>[5]<\/sup>\r\n  <\/p>\r\n\r\n  <figure class=\"ly-image ly-image-product\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE compact ATS-2P63 and ATS-4P63 automatic transfer switches for grid and generator backup power\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      LEEYEE compact 2P and 4P automatic transfer switches for normal and standby source switching. Final cold-storage application suitability depends on system voltage, transferred current, pole configuration, utilization category and actual load characteristics.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-note\">\r\n    <p>\r\n      <strong>How this product fits a cold-storage project:<\/strong> the compact LEEYEE ATS shown above is best treated as a source-transfer device within the refrigeration distribution architecture. A typical arrangement is utility + generator \u2192 compact ATS \u2192 refrigeration distribution\/control panel \u2192 compressors, fans, controllers and auxiliary loads.\r\n    <\/p>\r\n    <p>\r\n      Current public information for the compact ATS-63 lists 2P and 4P configurations, 6\u201363 A current options and utilization category AC-31B.<sup>[6]<\/sup> Therefore, do not conclude that a 63 A ATS-63 is suitable for directly switching a compressor merely because the compressor running current is below 63 A.\r\n    <\/p>\r\n    <p>\r\n      If compressor or other motor circuits pass directly through the ATS, the specific motor duty, utilization category, protection arrangement and project requirements must be confirmed before model approval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-buyer-meaning\">\r\n    <strong>Buyer meaning:<\/strong> ATS rated current and motor-switching suitability are two different checks. The compact product form can fit a cold-storage backup-power architecture without implying universal direct-compressor switching capability.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-sizing-and-generator-sizing-are-related-but-not-identical\"><\/span>ATS Sizing and Generator Sizing Are Related but Not Identical<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The automatic transfer switch must carry the transferred load continuously and perform its declared transfer duty. The generator must supply the steady-state demand and also tolerate the transient demand created as motors and other major loads are started or reconnected.\r\n  <\/p>\r\n\r\n  <p>\r\n    Cummins generator application guidance explains that motor-driven loads may require considerably more power while starting than while running and that abrupt application of a large load can produce voltage and frequency disturbances if the generating set is not adequately selected.<sup>[4]<\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>ATS Selection Checks<\/th>\r\n          <th>Generator Selection Checks<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td>Continuous transferred current<\/td>\r\n          <td>Total running load<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Voltage and frequency<\/td>\r\n          <td>Generator output voltage and frequency<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Number of poles<\/td>\r\n          <td>Available kW and kVA<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Utilization category and switching duty<\/td>\r\n          <td>Motor starting and transient capability<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Open-transition suitability<\/td>\r\n          <td>Step-load acceptance and recovery<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td>Short-circuit coordination<\/td>\r\n          <td>Generator protection and control strategy<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    <strong>Engineering meaning:<\/strong> a generator may need additional capacity for motor starting even when the ATS continuous-current rating appears adequate.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-happens-when-utility-power-fails\"><\/span>What Happens When Utility Power Fails?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A common misunderstanding is to treat ATS switching time as the entire cold-storage restoration time. It is not.\r\n  <\/p>\r\n\r\n  <div class=\"ly-flow-answer\">\r\n    <strong>Quick engineering answer<\/strong>\r\n    Detection time + generator starting + generator stabilization + ATS transfer + refrigeration restart logic together determine how long the cold-storage system takes to return to operation. The ATS contact-transfer interval is only one part of that sequence.\r\n  <\/div>\r\n\r\n  <figure class=\"ly-image\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/cold-storage-generator-ats-power-restoration-sequence.webp\"\r\n      alt=\"Cold storage generator and ATS power restoration sequence from utility failure to refrigeration system restart\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      Total refrigeration power-restoration time includes utility-failure detection, generator starting and stabilization, ATS transfer and equipment restart logic.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">1<\/span>\r\n    <h3>Utility power becomes unacceptable<\/h3>\r\n    <p>\r\n      The ATS or associated controller detects that the normal source is outside the configured acceptable conditions.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">2<\/span>\r\n    <h3>The generator receives a start request<\/h3>\r\n    <p>\r\n      The standby generator begins its start sequence. The actual start-signal interface depends on the ATS, generator controller and project wiring.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">3<\/span>\r\n    <h3>The generator becomes an acceptable source<\/h3>\r\n    <p>\r\n      The emergency source must become suitable for transfer before the load is connected. Generator starting and stabilization time is separate from the ATS contact-transfer interval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">4<\/span>\r\n    <h3>The ATS transfers the selected load<\/h3>\r\n    <p>\r\n      In open transition, the first source is disconnected before the second source is connected. This is break-before-make operation, so an intentional interruption occurs during transfer.<sup>[2]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">5<\/span>\r\n    <h3>The refrigeration system executes its restart logic<\/h3>\r\n    <p>\r\n      Compressors, fans, pumps and auxiliary equipment should restart according to the refrigeration controller, PLC, motor starters and wider system design. The ATS should not be assumed to perform compressor sequencing by itself.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>ATS switching time is not total refrigeration recovery time.<\/strong> Generator starting, source stabilization and compressor restart delays can make the complete restoration sequence much longer than the ATS contact-transfer interval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"is-open-transition-ats-suitable-for-cold-storage\"><\/span>Is Open-Transition ATS Suitable for Cold Storage?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Open transition can be suitable for cold-storage applications where the selected loads and controls are designed to tolerate a short interruption. During open-transition transfer, the normal source is disconnected before the emergency source is connected.<sup>[2]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    That does not make open transition universally suitable. The engineer should confirm interruption tolerance for the refrigeration controller, compressor control logic, alarms, monitoring equipment and any other critical circuit.\r\n  <\/p>\r\n\r\n  <p>\r\n    If a controller or monitoring circuit requires uninterrupted power, the project may need a separate continuity solution for that circuit rather than assuming that the entire refrigeration system requires a different transfer architecture.\r\n  <\/p>\r\n\r\n  <div class=\"ly-note\">\r\n    <p>\r\n      <strong>LEEYEE standard product scope for this article:<\/strong> the normal product direction is a compact open-transition ATS. Closed-transition and bypass-isolation systems should be treated as separate engineered solutions rather than standard compact ATS features.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"should-all-refrigeration-compressors-restart-at-the-same-time\"><\/span>Should All Refrigeration Compressors Restart at the Same Time?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    They should not be assumed to do so.\r\n  <\/p>\r\n\r\n  <p>\r\n    When several motors are applied to a generator at the same time, the combined transient demand can be much more difficult for the generating set than the normal running load. Generator application guidance describes load-step sequencing as one method of reducing the amount of load applied at one time.<sup>[4]<\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    In a cold-storage project, this sequencing may be handled by the refrigeration controller, PLC, motor starters, generator controls or a wider power-management design.\r\n  <\/p>\r\n\r\n  <p>\r\n    The ATS transfers the power source. It should not be credited with compressor sequencing, motor starting or load-management functions unless those functions are specifically documented for the selected system.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-select-an-ats-for-a-cold-storage-system\"><\/span>How to Select an ATS for a Cold-Storage System<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <figure class=\"ly-image\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/cold-storage-automatic-transfer-switch-selection-flow.webp\"\r\n      alt=\"Cold storage automatic transfer switch selection flow for refrigeration generator backup power systems\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption class=\"ly-caption\">\r\n      Cold-storage ATS selection should move from transferred loads and motor duty to electrical configuration, generator behavior and final project verification.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">1<\/span>\r\n    <h3>Identify the actual transferred loads<\/h3>\r\n    <p>\r\n      List every circuit that must operate during a utility outage. Separate essential refrigeration loads from circuits that can be delayed or excluded from generator operation.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">2<\/span>\r\n    <h3>Confirm whether compressor motors pass directly through the ATS<\/h3>\r\n    <p>\r\n      If the ATS directly switches motor circuits, verify its declared utilization category, motor-switching capability and project suitability. Do not infer this from ampere rating alone.<sup>[1][5]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">3<\/span>\r\n    <h3>Confirm system voltage, frequency and phase<\/h3>\r\n    <p>\r\n      Match the ATS to the actual system voltage and frequency. Confirm whether the project is single-phase or three-phase before choosing the pole configuration.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">4<\/span>\r\n    <h3>Determine the required pole configuration<\/h3>\r\n    <p>\r\n      Pole selection is not simply \u201csingle-phase equals 2P\u201d or \u201cthree-phase equals 4P\u201d in every project. Neutral treatment depends on source configuration, earthing arrangement and electrical design.\r\n    <\/p>\r\n    <p>\r\n      Schneider Electric distinguishes solid-neutral and switched-neutral transfer arrangements and explains that a switched-neutral design uses an additional pole to transfer the neutral between sources.<sup>[3]<\/sup>\r\n    <\/p>\r\n    <p>\r\n      Current public information for the LEEYEE ATS-63 lists 2P and 4P versions. Final pole selection must still match the project wiring and applicable electrical design.<sup>[6]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">5<\/span>\r\n    <h3>Calculate continuous transferred current<\/h3>\r\n    <p>\r\n      Use the real load schedule and applicable design requirements. Do not choose an ATS only from cold-room floor area, refrigeration capacity or one compressor nameplate value.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">6<\/span>\r\n    <h3>Check generator capacity separately<\/h3>\r\n    <p>\r\n      Confirm continuous generator capacity, motor-starting demand, voltage\/frequency response and expected load steps. The generator must remain within acceptable operating limits while refrigeration equipment is restored.<sup>[4]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">7<\/span>\r\n    <h3>Confirm acceptable transfer interruption<\/h3>\r\n    <p>\r\n      If the selected refrigeration and control loads can tolerate break-before-make transfer, open transition may be appropriate. If not, the system architecture requires further engineering review rather than an assumption that the standard ATS can provide uninterrupted power.<sup>[2]<\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <div class=\"ly-step\">\r\n    <span class=\"ly-step-number\">8<\/span>\r\n    <h3>Review protection and short-circuit coordination<\/h3>\r\n    <p>\r\n      An ATS is not a substitute for circuit breakers, fuses, motor protection or overload protection. Available fault current, upstream\/downstream protection and transfer-switch short-circuit ratings must be checked within the complete panel design.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-delay-settings-matter-in-refrigeration-backup-power\"><\/span>Why Delay Settings Matter in Refrigeration Backup Power<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Delay functions can help prevent the system from reacting to every brief utility disturbance and can allow the standby source to become stable before transfer. Separate restart delays may also be used by refrigeration controls to avoid reconnecting several motors at the same instant.\r\n  <\/p>\r\n\r\n  <p>\r\n    There is no single delay value that is correct for every cold room. Utility quality, generator characteristics, compressor controls, process requirements and equipment documentation all affect the appropriate setting.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <p>\r\n      <strong>Project confirmation required:<\/strong> do not apply a universal 5-second, 10-second or other fixed ATS delay unless that value is supported by the selected ATS, generator, refrigeration controller and project specification.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"common-cold-storage-ats-selection-mistakes\"><\/span>Common Cold-Storage ATS Selection Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Choosing the ATS from compressor running current only<\/h3>\r\n  <p>\r\n    Running current is important, but it does not prove that a transfer switch is suitable for the required motor-switching duty.\r\n  <\/p>\r\n\r\n  <h3>Assuming a larger ampere rating solves every problem<\/h3>\r\n  <p>\r\n    A higher ATS current rating does not automatically solve utilization-category, neutral, fault-current, motor-transfer or generator-starting issues.\r\n  <\/p>\r\n\r\n  <h3>Assuming the ATS controls compressor sequencing<\/h3>\r\n  <p>\r\n    Compressor sequencing normally belongs to the refrigeration controller, PLC, starter logic, generator control system or wider power-management design.\r\n  <\/p>\r\n\r\n  <h3>Ignoring neutral configuration<\/h3>\r\n  <p>\r\n    Whether the neutral remains solidly connected or is switched is a system-design question and should be checked against source configuration, earthing arrangement and project requirements.<sup>[3]<\/sup>\r\n  <\/p>\r\n\r\n  <h3>Treating open transition as uninterrupted power<\/h3>\r\n  <p>\r\n    Open-transition transfer intentionally disconnects one source before connecting the other. The load therefore experiences an interruption during the transfer process.<sup>[2]<\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-related\">\r\n    <strong>Related ATS selection guidance<\/strong>\r\n    For general ATS operating principles and source-transfer logic, see\r\n    <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose<\/a>.\r\n    For the compact LEEYEE product range referenced in this article, see the\r\n    <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\">LEEYEE ATS-63 product page<\/a>.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"information-to-prepare-before-ordering\"><\/span>Information to Prepare Before Ordering<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <h3>Cold-storage ATS project checklist<\/h3>\r\n\r\n    <p><strong>Power system<\/strong><\/p>\r\n    <ul>\r\n      <li>Nominal system voltage<\/li>\r\n      <li>Frequency<\/li>\r\n      <li>Single-phase or three-phase system<\/li>\r\n      <li>Neutral arrangement<\/li>\r\n      <li>Earthing \/ grounding arrangement<\/li>\r\n      <li>Single-line diagram<\/li>\r\n    <\/ul>\r\n\r\n    <p><strong>Refrigeration load<\/strong><\/p>\r\n    <ul>\r\n      <li>Total transferred running current<\/li>\r\n      <li>Compressor quantity<\/li>\r\n      <li>Individual motor ratings and rated current<\/li>\r\n      <li>Motor starting method: DOL, star-delta, soft starter, VFD or other<\/li>\r\n      <li>Evaporator and condenser fan loads<\/li>\r\n      <li>Pumps and defrost heaters<\/li>\r\n      <li>Control, alarm and monitoring circuits<\/li>\r\n      <li>Critical and non-critical load classification<\/li>\r\n    <\/ul>\r\n\r\n    <p><strong>Standby source<\/strong><\/p>\r\n    <ul>\r\n      <li>Generator rated kW \/ kVA<\/li>\r\n      <li>Generator output voltage and frequency<\/li>\r\n      <li>Generator controller model or relevant technical data<\/li>\r\n      <li>Remote-start interface requirements<\/li>\r\n      <li>Expected load-restoration sequence<\/li>\r\n    <\/ul>\r\n\r\n    <p><strong>ATS and panel requirements<\/strong><\/p>\r\n    <ul>\r\n      <li>Required rated current<\/li>\r\n      <li>Required pole configuration<\/li>\r\n      <li>Whether the ATS directly carries motor circuits<\/li>\r\n      <li>Acceptable interruption during transfer<\/li>\r\n      <li>Available short-circuit current and protective-device arrangement<\/li>\r\n      <li>Installation method and available panel space<\/li>\r\n      <li>Required standard, certification or project documentation<\/li>\r\n      <li>Quantity and OEM \/ private-label requirements<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Need to confirm an ATS configuration for a cold-storage project?<\/h3>\r\n    <p>\r\n      Send the single-line diagram, transferred-load schedule, compressor motor data and generator specifications. LEEYEE can review the electrical configuration and help confirm whether a compact ATS fits the intended transfer duty.\r\n    <\/p>\r\n    <div class=\"ly-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Request ATS Configuration Review\">\r\n        <span class=\"w-btn-label\">Request ATS Configuration Review<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/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>Can an automatic transfer switch power a cold-storage compressor?<\/h3>\r\n      <p>\r\n        An ATS can form part of the supply path to a refrigeration compressor, but direct motor-switching suitability must be verified from the actual ATS ratings, utilization category, product documentation and circuit arrangement. Ampere rating alone is not enough.<sup>[1][5]<\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Should ATS size be based on compressor starting current?<\/h3>\r\n      <p>\r\n        ATS continuous-current selection and generator motor-starting calculations are related but not identical. The ATS must meet its declared load-switching duty and continuous-current requirements, while the generator must also handle transient power demanded when motors start or reconnect.<sup>[4][5]<\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is a 4-pole ATS always required for a three-phase cold room?<\/h3>\r\n      <p>\r\n        No universal rule should be applied without reviewing the system. The decision depends on whether the neutral must be switched, the earthing arrangement, generator configuration and project requirements. Switched-neutral ATS arrangements use an additional pole for the neutral.<sup>[3]<\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>How long will a cold-storage system lose power during generator transfer?<\/h3>\r\n      <p>\r\n        Total restoration time includes utility-failure detection, generator starting, generator stabilization, ATS transfer and refrigeration restart logic. The ATS contact-transfer interval is only one part of the complete process.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is open-transition ATS suitable for refrigeration systems?<\/h3>\r\n      <p>\r\n        It can be suitable when the selected refrigeration and control loads tolerate a short interruption. Open transition is break-before-make, so the load is intentionally disconnected between sources. Circuits requiring greater continuity need separate engineering review.<sup>[2]<\/sup>\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Should compressors restart automatically after ATS transfer?<\/h3>\r\n      <p>\r\n        Restart behavior should be determined by the refrigeration equipment, PLC, motor starters and project control logic. The ATS transfers the power source; it should not automatically be assumed to control compressor restart sequencing.\r\n      <\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <div class=\"ly-scope\">\r\n    <strong>Engineering scope:<\/strong> this guide supports B2B selection and procurement discussion. Final ATS selection must be checked against the selected model datasheet, refrigeration equipment documentation, generator data, single-line diagram, applicable electrical requirements and current project specification.\r\n  <\/div>\r\n\r\n  <section class=\"ly-references\">\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ol>\r\n      <li>\r\n        IEC \u2014 <em>IEC 60947-6-1:2026, 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\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li>\r\n        Schneider Electric \/ ASCO \u2014 <em>What are the different ASCO ATS transition modes?<\/em> Open transition is described as break-before-make operation.\r\n        <a href=\"https:\/\/www.se.com\/sg\/en\/faqs\/FAQ000219583\/\" target=\"_blank\" rel=\"noopener\">Schneider Electric technical FAQ<\/a>.\r\n      <\/li>\r\n      <li>\r\n        Schneider Electric \/ ASCO \u2014 <em>What neutral configurations are available for ASCO Transfer Switches?<\/em> Technical explanation of solid and switched-neutral transfer arrangements.\r\n        <a href=\"https:\/\/www.se.com\/sg\/en\/faqs\/FAQ000220886\/\" target=\"_blank\" rel=\"noopener\">Schneider Electric technical FAQ<\/a>.\r\n      <\/li>\r\n      <li>\r\n        Cummins Power Generation \u2014 <em>Application Manual: Liquid Cooled Generator Sets<\/em>. Guidance covering running load, motor starting requirements and load-step sequencing.\r\n        <a href=\"https:\/\/incal.cummins.com\/www\/literature\/applicationmanuals\/t030.pdf\" target=\"_blank\" rel=\"noopener\">Cummins application manual<\/a>.\r\n      <\/li>\r\n      <li>\r\n        Cummins Power Generation \u2014 <em>Transfer Switch Application Manual<\/em>. Guidance covering transfer-switch application and motor-load switching considerations.\r\n        <a href=\"https:\/\/www.cummins.com\/sites\/default\/files\/2024-08\/t011-Transfer-switch-application-manual.pdf\" target=\"_blank\" rel=\"noopener\">Cummins transfer-switch application manual<\/a>.\r\n      <\/li>\r\n      <li>\r\n        LEEYEE \u2014 <em>ATS-63 Automatic Transfer Switch 2P \/ 4P 6A\u201363A for Backup Power Systems<\/em>. Public product data lists current options, 2P\/4P configurations and utilization category AC-31B.\r\n        <a href=\"https:\/\/www.cnspd.com\/products\/leeyee-automatic-transfer-switch-solar-backup\/\" target=\"_blank\" rel=\"noopener\">LEEYEE ATS-63 product page<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\ndocument.addEventListener('DOMContentLoaded', function () {\r\n  var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n  aboutPopupButtons.forEach(function (button) {\r\n    button.addEventListener('click', function () {\r\n      var realPopupTrigger = document.querySelector(\r\n        '.w-popup.ush_popup_1 .w-popup-trigger'\r\n      );\r\n\r\n      if (realPopupTrigger) {\r\n        realPopupTrigger.click();\r\n      } else {\r\n        window.open(\r\n          'https:\/\/www.cnspd.com\/contact\/',\r\n          '_blank',\r\n          'noopener'\r\n        );\r\n      }\r\n    });\r\n  });\r\n});\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Selecting an automatic transfer switch for a cold-storage or refrigeration system is not simply a matter of matching an ATS ampere rating to the total refrigeration load. The correct selection depends on which circuits will transfer, whether compressor motors pass directly through the ATS, how the standby generator accepts those loads, the phase and neutral&#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-31556","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>Cold Storage Automatic Transfer Switch | Generator &amp; ATS Selection Guide<\/title>\n<meta name=\"description\" content=\"Learn how to select an automatic transfer switch for cold storage and refrigeration systems, including compressor loads, generator capacity, open-transition operation, pole selection, neutral switching and restart requirements.\" \/>\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\/fr\/cold-storage-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cold Storage Automatic Transfer Switch | Generator &amp; ATS Selection Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to select an automatic transfer switch for cold storage and refrigeration systems, including compressor loads, generator capacity, open-transition operation, pole selection, neutral switching and restart requirements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/fr\/cold-storage-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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