{"id":17930,"date":"2026-09-19T08:00:00","date_gmt":"2026-09-19T00:00:00","guid":{"rendered":"https:\/\/www.wehopower.com\/?post_type=news&#038;p=17930"},"modified":"2026-09-21T15:09:01","modified_gmt":"2026-09-21T07:09:01","slug":"power-supply-derating","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/","title":{"rendered":"Power Supply Derating Guide for Industrial Control Cabinets"},"content":{"rendered":"<p class=\"weho-last-updated\" style=\"text-align:center;color:#E60013;\">Last Updated: 2026-09-18<\/p>\n<blockquote class=\"weho-quick-answer\">\n<p>power supply derating for industrial control cabinets means using a supply below its maximum rating when heat, airflow, input voltage, altitude, mounting, or continuous load reduces usable output. Start with the real load, then check the product derating curve, cabinet temperature, cooling path, wiring loss, and startup current before selecting the final wattage.<\/p>\n<\/blockquote>\n<figure class=\"weho-blog-image weho-blog-hero\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/01-hero-50.png?quality=85&strip=all\" alt=\"WEHO LRS power supply inside an environmental chamber for power supply derating testing\" title=\"WEHO LRS power supply inside an environmental chamber for power supply derating testing\" width=\"1536\" height=\"1024\" class=\"alignnone size-full wp-image-17953\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/01-hero-50.png?quality=85&strip=all 1536w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/01-hero-50-300x200.png?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/01-hero-50-1024x683.png?quality=85&strip=all 1024w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/01-hero-50-768x512.png?quality=85&strip=all 768w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/01-hero-50-18x12.png?quality=85&strip=all 18w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey 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\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/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=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#power_supply_derating_starts_with_heat\" >power supply derating starts with heat<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Read_the_derating_curve_before_choosing_wattage\" >Read the derating curve before choosing wattage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Calculate_continuous_load_and_peak_load_separately\" >Calculate continuous load and peak load separately<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Cabinet_installation_changes_the_usable_load\" >Cabinet installation changes the usable load<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Verify_derating_under_a_realistic_load\" >Verify derating under a realistic load<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Selection_mistakes_to_avoid\" >Selection mistakes to avoid<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Key_Takeaways\" >Key Takeaways<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Faqs\" >Faqs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#What_does_power_supply_derating_mean\" >What does power supply derating mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Why_does_ambient_temperature_affect_derating\" >Why does ambient temperature affect derating?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Is_a_450W_power_supply_always_safe_for_a_400W_load\" >Is a 450W power supply always safe for a 400W load?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#How_much_derating_margin_should_I_leave\" >How much derating margin should I leave?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Does_forced_air_cooling_reduce_derating\" >Does forced air cooling reduce derating?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Which_WEHO_product_family_should_I_check_for_derating\" >Which WEHO product family should I check for derating?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.wehopower.com\/hi\/news\/power-supply-derating\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"power_supply_derating_starts_with_heat\"><\/span>power supply derating starts with heat<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"weho-blog-image\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/02-technical-diagram-45.png?quality=85&strip=all\" alt=\"Power supply derating checklist for load temperature airflow and input voltage\" title=\"Power supply derating checklist for load temperature airflow and input voltage\" width=\"1536\" height=\"1024\" class=\"alignnone size-full wp-image-17954\" loading=\"lazy\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/02-technical-diagram-45.png?quality=85&strip=all 1536w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/02-technical-diagram-45-300x200.png?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/02-technical-diagram-45-1024x683.png?quality=85&strip=all 1024w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/02-technical-diagram-45-768x512.png?quality=85&strip=all 768w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/02-technical-diagram-45-18x12.png?quality=85&strip=all 18w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<p><strong>power supply derating<\/strong> is the practice of reducing the usable output below the maximum rating when real operating conditions are harsher than the test condition printed in the data sheet. The nameplate wattage is only a starting point. Cabinet temperature, airflow, mounting direction, input voltage, altitude, and load profile all decide how much output is actually safe.<\/p>\n<p>Many power supply problems begin when a design treats rated wattage as available wattage in every enclosure. A 450W supply may not be suitable for a continuous 430W load inside a sealed cabinet near drives, relays, heaters, or warm ambient air. If heat cannot leave the case, internal components age faster and protection circuits may trip at the worst moment.<\/p>\n<p>For WEHO selection, start with the approved <a href=\"https:\/\/www.wehopower.com\/product_category\/enclosed-switching-power-supply\/\">WEHO enclosed switching power supply category<\/a> and confirm the exact model data sheet. If the design uses an LRS-style enclosed supply, check the specific output voltage, cooling method, installation clearance, and derating curve before deciding final load.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Read_the_derating_curve_before_choosing_wattage\"><\/span>Read the derating curve before choosing wattage<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"weho-blog-image\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/03-product-52.png?quality=85&strip=all\" alt=\"WEHO LRS power supply with derating curve and airflow measurement\" title=\"WEHO LRS power supply with derating curve and airflow measurement\" width=\"1536\" height=\"1024\" class=\"alignnone size-full wp-image-17955\" loading=\"lazy\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/03-product-52.png?quality=85&strip=all 1536w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/03-product-52-300x200.png?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/03-product-52-1024x683.png?quality=85&strip=all 1024w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/03-product-52-768x512.png?quality=85&strip=all 768w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/03-product-52-18x12.png?quality=85&strip=all 18w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<p>A derating curve shows how usable load changes as a condition changes. The most common curve is ambient temperature versus load percentage. For example, a supply may allow full load up to one temperature, then require reduced load as ambient temperature rises. Some products also have input-voltage derating or altitude derating.<\/p>\n<p>Do not copy a derating percentage from another product family. A fan-cooled enclosed supply, a convection-cooled DIN rail module, a waterproof LED driver, and a compact adapter can all have different thermal paths. Use the exact WEHO model documentation for the final calculation.<\/p>\n<p>The practical method is simple:<\/p>\n<ul>\n<li>Find the real continuous load.<\/li>\n<li>Add startup and peak load checks.<\/li>\n<li>Estimate cabinet ambient temperature near the power supply, not room temperature.<\/li>\n<li>Confirm whether the supply has free air, restricted air, or forced air.<\/li>\n<li>Apply the model-specific derating curve.<\/li>\n<li>Leave service margin for dust, filter aging, and future load additions.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Calculate_continuous_load_and_peak_load_separately\"><\/span>Calculate continuous load and peak load separately<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Continuous load is the output current the supply must deliver for long periods. Peak load is the short demand caused by motors, relays, solenoids, lamps, capacitive input stages, or communication modules starting together. Derating mainly protects continuous operation, but peak behavior still matters because a supply near its thermal limit has less room for transients.<\/p>\n<p>For a 24V system, calculate watts from volts times amps. A 24V load drawing 12A needs 288W before margin. If the same cabinet may later add more I\/O, lamps, fans, or sensors, include that planned load instead of sizing only for today.<\/p>\n<p>Low input voltage can also change the thermal condition. When the input is near the low end of the allowed AC range, current and losses can increase inside the supply. If the product data gives a reduced load at low input, apply it before signing off the design.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cabinet_installation_changes_the_usable_load\"><\/span>Cabinet installation changes the usable load<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"weho-blog-image\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/04-installation-56.png?quality=85&strip=all\" alt=\"WEHO LRS power supply installed in a cabinet during ambient temperature check\" title=\"WEHO LRS power supply installed in a cabinet during ambient temperature check\" width=\"1536\" height=\"1024\" class=\"alignnone size-full wp-image-17956\" loading=\"lazy\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/04-installation-56.png?quality=85&strip=all 1536w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/04-installation-56-300x200.png?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/04-installation-56-1024x683.png?quality=85&strip=all 1024w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/04-installation-56-768x512.png?quality=85&strip=all 768w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/04-installation-56-18x12.png?quality=85&strip=all 18w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<p>The best derating calculation can fail if the cabinet layout blocks cooling. Enclosed switching power supplies need space around ventilation slots and a path for warm air to rise or be removed. Mounting the supply too close to a wire duct, side wall, relay bank, or heat-producing drive can make the local ambient temperature much higher than expected.<\/p>\n<p>Measure temperature where the supply actually sits. A cabinet can be 25\u00b0C outside and much warmer near the top rail or beside a drive. If the supply runs continuously, check temperature after the machine reaches stable operating conditions, not immediately after startup.<\/p>\n<p>Vent filters, cabinet fans, and heat exchangers need maintenance. A clean new panel may pass a factory test, while a dusty field cabinet reaches higher internal temperatures months later. This is why conservative power supply derating is a reliability decision, not only a sizing formula.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Verify_derating_under_a_realistic_load\"><\/span>Verify derating under a realistic load<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"weho-blog-image\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/05-application-50.png?quality=85&strip=all\" alt=\"WEHO LRS power supply connected to a load bank for derating verification\" title=\"WEHO LRS power supply connected to a load bank for derating verification\" width=\"1536\" height=\"1024\" class=\"alignnone size-full wp-image-17957\" loading=\"lazy\" srcset=\"https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/05-application-50.png?quality=85&strip=all 1536w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/05-application-50-300x200.png?quality=85&strip=all 300w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/05-application-50-1024x683.png?quality=85&strip=all 1024w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/05-application-50-768x512.png?quality=85&strip=all 768w, https:\/\/i1.wp.com\/www.wehopower.com\/wp-content\/uploads\/2026\/09\/05-application-50-18x12.png?quality=85&strip=all 18w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<p>Before release, test the power supply with a load close to the real application. Confirm output voltage, case temperature, fan operation if present, input voltage, and surrounding cabinet temperature. If the product is intended for 24\/7 duty, a short no-load test does not prove the thermal margin.<\/p>\n<p>Record the test condition with the final equipment file. Include ambient temperature, load current, input voltage, cabinet fan status, and whether doors or filters were in their normal operating condition. This makes later service easier because the technician can compare field symptoms with the original design assumption.<\/p>\n<p>If a supply runs hot, do not only move to a larger wattage. Check blocked airflow, wrong mounting orientation, overloaded branches, excessive cable drop, poor cabinet ventilation, and low input voltage. Sometimes the correct fix is improved cooling or load separation rather than a larger unit in the same hot location.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Selection_mistakes_to_avoid\"><\/span>Selection mistakes to avoid<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Avoid these common mistakes when applying <strong>power supply derating<\/strong>:<\/p>\n<ul>\n<li>Using room temperature instead of cabinet temperature.<\/li>\n<li>Treating rated wattage as usable wattage in every installation.<\/li>\n<li>Ignoring input-voltage derating.<\/li>\n<li>Blocking ventilation slots with ducts or cable bundles.<\/li>\n<li>Forgetting startup current and simultaneous loads.<\/li>\n<li>Reusing another model&#8217;s derating curve.<\/li>\n<li>Skipping field conditions such as dust, filters, and fan failure.<\/li>\n<\/ul>\n<p>For purchasing, specify output voltage, continuous load, expected peak load, input voltage range, ambient temperature, mounting orientation, airflow condition, and required service margin. This helps engineering and purchasing choose the right WEHO model instead of comparing only price and watts.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>power supply derating<\/strong> converts nameplate wattage into safe usable output under real heat and airflow conditions.<\/li>\n<li>Cabinet ambient temperature near the supply matters more than room temperature.<\/li>\n<li>Use the exact WEHO model derating curve; do not borrow a curve from another product family.<\/li>\n<li>Continuous load, peak load, low input voltage, and cooling path should be checked together.<\/li>\n<li>Good clearance, ventilation, and test records reduce field failures.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Faqs\"><\/span>Faqs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"weho-visible-faq\">\n<h3><span class=\"ez-toc-section\" id=\"What_does_power_supply_derating_mean\"><\/span>What does power supply derating mean?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Power supply derating means operating the supply below its maximum nameplate output when heat, airflow, input voltage, altitude, mounting, or duty cycle reduces the safe continuous load.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_does_ambient_temperature_affect_derating\"><\/span>Why does ambient temperature affect derating?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Higher ambient temperature leaves less thermal margin for internal components. If the cabinet is warm or poorly ventilated, the power supply may need a lower continuous load than its rated wattage.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_a_450W_power_supply_always_safe_for_a_400W_load\"><\/span>Is a 450W power supply always safe for a 400W load?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Not always. A 400W continuous load can still be too high if the supply is installed in a hot enclosure, has restricted airflow, low input voltage, high altitude, or repeated startup surges.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_much_derating_margin_should_I_leave\"><\/span>How much derating margin should I leave?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Use the exact product derating curve first. When conditions are uncertain, leave practical margin for cabinet temperature, cable loss, startup current, and long service life instead of sizing only from nameplate watts.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_forced_air_cooling_reduce_derating\"><\/span>Does forced air cooling reduce derating?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Forced air can improve usable output when the product data allows it, but the airflow path must be real. Blocked vents, dirty filters, or crowded cabinets can remove that benefit.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Which_WEHO_product_family_should_I_check_for_derating\"><\/span>Which WEHO product family should I check for derating?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>For enclosed AC-DC supplies, start with the WEHO enclosed switching power supply category and then verify the exact model data sheet, installation orientation, cooling requirement, and derating curve.<\/p>\n<\/div>\n<p>The FAQ section below summarizes practical derating questions for selection, installation, and field service checks.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>power supply derating<\/strong> is a practical reliability check. Start with the real load, confirm the exact product curve, measure cabinet conditions, and leave enough margin for heat, airflow, startup demand, and long service life. For enclosed AC-DC supplies, review the <a href=\"https:\/\/www.wehopower.com\/product_category\/enclosed-switching-power-supply\/\">WEHO enclosed switching power supply category<\/a>, confirm the final model data, or contact [sarayu@chnwh.com](mailto:sarayu@chnwh.com) through the <a href=\"https:\/\/www.wehopower.com\/contact\/\">WEHO contact page<\/a> before release.<\/p>\n<div class=\"weho-article-cta\">\n<p>Review the <a href=\"https:\/\/www.wehopower.com\/product_category\/enclosed-switching-power-supply\/\">relevant WEHO product category<\/a>, email <a href=\"mailto:sarayu@chnwh.com\">sarayu@chnwh.com<\/a>, or <a href=\"https:\/\/www.wehopower.com\/contact\/\">contact WEHO<\/a> with the input voltage, output load, ambient temperature, and installation details.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>power supply derating guide for industrial control cabinets: load percentage, ambient temperature, cabinet airflow, input voltage, altitude, and margin.<\/p>","protected":false},"author":1,"featured_media":17953,"parent":0,"menu_order":4,"comment_status":"closed","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,148],"class_list":["post-17930","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-industry-news","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news\/17930","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/comments?post=17930"}],"version-history":[{"count":2,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news\/17930\/revisions"}],"predecessor-version":[{"id":17958,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news\/17930\/revisions\/17958"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/media\/17953"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/media?parent=17930"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/hi\/wp-json\/wp\/v2\/news_category?post=17930"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}