{"id":3281,"date":"2026-09-19T12:44:07","date_gmt":"2026-09-19T12:44:07","guid":{"rendered":"https:\/\/voltnexpower.com\/?p=3281"},"modified":"2026-09-19T12:58:48","modified_gmt":"2026-09-19T12:58:48","slug":"480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide","status":"publish","type":"post","link":"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/","title":{"rendered":"480-208Y\/120 Volt 3 Phase Transformer: kVA Sizes, Applications and Selection Guide"},"content":{"rendered":"<p class=\"isSelectedEnd\">A <a href=\"https:\/\/voltnexpower.com\/it\/industrial-dry-type-isolation-transformers-custom-manufacturer-factory\/\"><strong>480-208Y\/120 volt 3 phase transformer<\/strong><\/a> is widely used when a facility has a 480V three-phase power source but needs a lower-voltage <strong>208Y\/120V three-phase, four-wire system<\/strong> for equipment, lighting, receptacles, controls and other electrical loads.<\/p>\n<p class=\"isSelectedEnd\">Among the available sizes, <a href=\"https:\/\/voltnexpower.com\/it\/manufacturer\/75kva-copper-winding-isolation-transformer-three-phase-dry-type-industrial-transformer-480v-600v-supplier\/\"><strong>75 kVA 480-208Y\/120 volt 3 phase transformers<\/strong><\/a> are a particularly useful configuration for commercial and industrial power distribution. However, the correct transformer capacity depends on the connected load, demand load, motor starting requirements, future expansion and the required secondary current.<\/p>\n<p class=\"isSelectedEnd\">Voltnex Power manufactures customized dry type transformers for 480V to 208Y\/120V applications, with different kVA capacities, winding materials, voltage configurations, cooling methods, enclosures and mounting options available according to project requirements.<\/p>\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:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#What_Is_a_480-208Y120_Volt_3_Phase_Transformer\" >What Is a 480-208Y\/120 Volt 3 Phase Transformer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#Why_Convert_480V_to_208Y120V\" >Why Convert 480V to 208Y\/120V?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#Common_480V_to_208Y120V_Transformer_kVA_Sizes\" >Common 480V to 208Y\/120V Transformer kVA Sizes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#1_kVA_480V_to_208Y120V_Transformer\" >1 kVA 480V to 208Y\/120V Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#5_kVA_Transformer\" >5 kVA Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#75_kVA_Transformer\" >7.5 kVA Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#15_kVA_Transformer\" >15 kVA Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#30_kVA_Transformer\" >30 kVA Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#75_kVA_Transformer-2\" >75 kVA Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#150_kVA_Transformer\" >150 kVA Transformer<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#How_to_Select_the_Correct_Transformer_Capacity\" >How to Select the Correct Transformer Capacity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#Dry_Type_vs_Oil_Filled_Transformer\" >Dry Type vs. Oil Filled Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#Applications_of_480-208Y120V_Transformers\" >Applications of 480-208Y\/120V Transformers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#Custom_480V_to_208Y120V_Transformer_Manufacturer\" >Custom 480V to 208Y\/120V Transformer Manufacturer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/voltnexpower.com\/it\/480-208y-120-volt-3-phase-transformer-kva-sizes-applications-and-selection-guide\/#Get_a_480-208Y120_Volt_3_Phase_Transformer_Quote\" >Get a 480-208Y\/120 Volt 3 Phase Transformer Quote<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_480-208Y120_Volt_3_Phase_Transformer\"><\/span>What Is a 480-208Y\/120 Volt 3 Phase Transformer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">A 480-208Y\/120V transformer is a <a href=\"https:\/\/voltnexpower.com\/it\/step-down-power-transformer-complete-guide-to-voltage-reduction-types-applications-selection\/\"><strong>three-phase step-down transformer<\/strong><\/a> that converts a 480V primary supply into a 208Y\/120V secondary system.<\/p>\n<p class=\"isSelectedEnd\">The 208Y\/120V designation is important because the secondary system provides two useful voltage levels:<\/p>\n<ul data-spread=\"false\">\n<li><strong>208V between phases<\/strong> for three-phase equipment<\/li>\n<li><strong>120V between phase and neutral<\/strong> for single-phase loads<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">This allows one transformer to supply different types of electrical equipment within the same facility.<\/p>\n<p class=\"isSelectedEnd\">A common configuration is:<\/p>\n<p class=\"isSelectedEnd\"><strong>480V 3 Phase \u2192 208Y\/120V 3 Phase<\/strong><\/p>\n<p class=\"isSelectedEnd\">For many commercial and industrial installations, the primary may be configured as <strong>480V Delta<\/strong>, while the secondary is a grounded wye connection providing 208V phase-to-phase and 120V phase-to-neutral power. Comparable commercial 75 kVA products are offered with this configuration.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Convert_480V_to_208Y120V\"><\/span>Why Convert 480V to 208Y\/120V?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">Many industrial facilities distribute power at 480V because it is suitable for larger equipment and can reduce current on the upstream distribution system. However, many downstream loads do not operate directly at 480V.<\/p>\n<p class=\"isSelectedEnd\">A 208Y\/120V secondary can supply:<\/p>\n<p class=\"isSelectedEnd\"><strong>208V loads<\/strong><\/p>\n<ul data-spread=\"false\">\n<li>Three-phase machinery<\/li>\n<li>HVAC equipment<\/li>\n<li>Pumps<\/li>\n<li>Motors<\/li>\n<li>Industrial equipment<\/li>\n<li>Commercial electrical equipment<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\"><strong>120V loads<\/strong><\/p>\n<ul data-spread=\"false\">\n<li>Lighting<\/li>\n<li>Receptacles<\/li>\n<li>Control circuits<\/li>\n<li>PLC and auxiliary equipment<\/li>\n<li>Office and general-purpose loads<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">The transformer therefore creates a lower-voltage distribution system suitable for mixed commercial and industrial loads.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_480V_to_208Y120V_Transformer_kVA_Sizes\"><\/span>Common 480V to 208Y\/120V Transformer kVA Sizes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">Transformer capacity should be selected from the actual electrical load rather than simply choosing the largest available rating. Common capacities can range from small transformers for controls and dedicated equipment to large units for facility-level distribution.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_kVA_480V_to_208Y120V_Transformer\"><\/span>1 kVA 480V to 208Y\/120V Transformer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">A <strong>1 kVA transformer<\/strong> is suitable for small control, instrumentation and dedicated auxiliary loads where the required power is relatively low. It may be considered for individual equipment or control systems rather than an entire facility distribution panel.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_kVA_Transformer\"><\/span>5 kVA Transformer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">A <strong>5 kVA 480V to 208Y\/120V transformer<\/strong> provides more capacity for machinery controls, small equipment, lighting circuits and auxiliary electrical systems. It can be useful where several smaller loads need to be supplied from the same transformer.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"75_kVA_Transformer\"><\/span>7.5 kVA Transformer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">A <strong>7.5 kVA transformer<\/strong> is another practical size for small industrial equipment, control panels and auxiliary distribution. The actual suitability depends on the combined load and whether the connected equipment includes motors or other loads with high starting current.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"15_kVA_Transformer\"><\/span>15 kVA Transformer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">A <a href=\"https:\/\/voltnexpower.com\/it\/manufacturer\/15kva-three-phase-dry-type-isolation-transformer-industrial-electrical-transformer-220v-380v-480v\/\"><strong>15 kVA 480V to 208Y\/120V transformer<\/strong><\/a> is suitable for larger machinery, small commercial panels, production equipment and mixed auxiliary loads. It provides substantially more secondary capacity than the smaller 1\u20137.5 kVA units.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"30_kVA_Transformer\"><\/span>30 kVA Transformer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">A <a href=\"https:\/\/voltnexpower.com\/it\/manufacturer\/30kva-three-phase-isolation-transformer-dry-type-power-transformer-for-cnc-machine-and-industrial-equipment\/\"><strong>30 kVA three-phase transformer<\/strong><\/a> is commonly considered for larger equipment groups, commercial distribution panels, industrial production areas and automation systems. It can supply both 208V three-phase equipment and 120V single-phase loads through the secondary distribution system.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"75_kVA_Transformer-2\"><\/span>75 kVA Transformer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">The <strong>75 kVA 480-208Y\/120 volt 3 phase transformer<\/strong> is one of the key configurations for commercial and industrial applications.<\/p>\n<p>A typical 75 kVA configuration can include:<\/p>\n\n<p><!-- HTML & Inline CSS Table Component (Full Width with Vertical Dividers) --><\/p>\n<div style=\"width: 100%; max-width: 100%; margin: 20px 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; box-shadow: 0 4px 12px rgba(0,0,0,0.05); border-radius: 8px; overflow: hidden; border: 1px solid #e5e7eb;\">\n<div style=\"overflow-x: auto; width: 100%;\">\n<table style=\"width: 100%; border-collapse: collapse; text-align: left; background-color: #ffffff; font-size: 14px; line-height: 1.5; color: #374151;\">\n<thead>\n<tr style=\"background-color: #1e293b; color: #ffffff;\">\n<th style=\"padding: 14px 20px; font-weight: 600; text-transform: uppercase; font-size: 13px; letter-spacing: 0.05em; width: 35%; border-bottom: 2px solid #0f172a; border-right: 1px solid #334155;\">Parameter<\/th>\n<th style=\"padding: 14px 20px; font-weight: 600; text-transform: uppercase; font-size: 13px; letter-spacing: 0.05em; width: 65%; border-bottom: 2px solid #0f172a;\">Typical Configuration<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom: 1px solid #e5e7eb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#ffffff'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Capacity<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">75 kVA<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; background-color: #f9fafb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#f9fafb'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Primary Voltage<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">480V<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#ffffff'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Secondary Voltage<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">208Y\/120V<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; background-color: #f9fafb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#f9fafb'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Phase<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">Three Phase<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#ffffff'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Frequency<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">60Hz<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; background-color: #f9fafb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#f9fafb'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Transformer Type<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">Dry Type<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#ffffff'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Cooling<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">Natural Air Cooling<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; background-color: #f9fafb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#f9fafb'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Primary Connection<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">Delta or customized<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#ffffff'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Secondary Connection<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">Wye with Neutral<\/td>\n<\/tr>\n<tr style=\"border-bottom: 1px solid #e5e7eb; background-color: #f9fafb; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#f9fafb'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Winding<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">Copper or Aluminum<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff; transition: background-color 0.2s ease;\" onmouseover=\"this.style.backgroundColor='#f8fafc'\" onmouseout=\"this.style.backgroundColor='#ffffff'\">\n<td style=\"padding: 14px 20px; font-weight: 600; color: #0f172a; border-right: 1px solid #e5e7eb;\">Application<\/td>\n<td style=\"padding: 14px 20px; color: #4b5563;\">Commercial and Industrial Distribution<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n\n<p class=\"isSelectedEnd\">For a 75 kVA transformer, the approximate full-load current is <strong>90.2A on the 480V three-phase primary<\/strong> and <strong>208.2A on the 208V secondary<\/strong>, calculated using the three-phase current formula.<\/p>\n<p class=\"isSelectedEnd\">This capacity is often useful when a facility needs to supply a combination of machinery, HVAC, lighting, receptacles and auxiliary electrical systems from a single transformer.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"150_kVA_Transformer\"><\/span>150 kVA Transformer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">A <a href=\"https:\/\/voltnexpower.com\/it\/manufacturer\/75kva-copper-winding-isolation-transformer-three-phase-dry-type-industrial-transformer-480v-600v-supplier\/\"><strong>150 kVA 480V to 208Y\/120V transformer<\/strong><\/a> is designed for significantly larger electrical loads and can be used for manufacturing facilities, larger commercial buildings, production areas, data-related infrastructure and centralized low-voltage distribution.<\/p>\n<p class=\"isSelectedEnd\">At this capacity, transformer installation details such as available fault current, impedance, protection, ventilation, enclosure, cable sizing and installation environment become increasingly important.<\/p>\n<p class=\"isSelectedEnd\">Other commonly specified capacities include <strong><a href=\"https:\/\/voltnexpower.com\/it\/manufacturer\/45kva-three-phase-dry-type-isolation-transformer-110v-120v-220v-380v-480v-industrial-transformer-with-custom-voltage-options\/\">45 kVA<\/a>, <a href=\"https:\/\/voltnexpower.com\/it\/manufacturer\/112-5kva-three-phase-dry-type-isolation-transformer-480v-600v-to-208v-220v-240v-industrial-electrical-power-transformer-oem-manufacturer\/\">112.5 kVA<\/a>, <a href=\"https:\/\/voltnexpower.com\/it\/manufacturer\/225kva-three-phase-dry-type-isolation-transformer-high-capacity-industrial-power-transformer\/\">225 kVA<\/a> and larger ratings<\/strong>, depending on the project. Standard three-phase transformer ratings commonly include 15, 30, 45, 75, 112.5 and 150 kVA.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Select_the_Correct_Transformer_Capacity\"><\/span>How to Select the Correct Transformer Capacity<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">The most important step is to calculate the actual electrical demand.<\/p>\n<p class=\"isSelectedEnd\">For a three-phase transformer, approximate apparent power can be calculated from voltage and current using:<\/p>\n<p class=\"isSelectedEnd\"><strong>kVA = \u221a3 \u00d7 V \u00d7 I \u00f7 1,000<\/strong><\/p>\n<p class=\"isSelectedEnd\">The full-load current can therefore be estimated as:<\/p>\n<p class=\"isSelectedEnd\"><strong>I = kVA \u00d7 1,000 \u00f7 (\u221a3 \u00d7 V)<\/strong><\/p>\n<p class=\"isSelectedEnd\">For example, a 75 kVA transformer at 480V has approximately:<\/p>\n<p class=\"isSelectedEnd\"><strong>75,000 \u00f7 (1.732 \u00d7 480) \u2248 90.2A<\/strong><\/p>\n<p class=\"isSelectedEnd\">On the 208V secondary:<\/p>\n<p class=\"isSelectedEnd\"><strong>75,000 \u00f7 (1.732 \u00d7 208) \u2248 208.2A<\/strong><\/p>\n<p class=\"isSelectedEnd\">These values are useful for preliminary transformer selection, but the final electrical design should also consider continuous loads, motor starting current, power factor, harmonics, ambient temperature, future expansion and applicable electrical codes.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Dry_Type_vs_Oil_Filled_Transformer\"><\/span>Dry Type vs. Oil Filled Transformer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">For indoor commercial and industrial installations, a <strong>dry type transformer<\/strong> is often selected because it uses air rather than liquid insulation and cooling.<\/p>\n<p class=\"isSelectedEnd\">A dry type 480V to 208Y\/120V transformer can be designed with natural air cooling and an appropriate enclosure for the installation environment.<\/p>\n<p class=\"isSelectedEnd\">For example, commercially available 75 kVA units are offered as dry type transformers with natural convection cooling and 480V delta primary \/ 208Y\/120V secondary configurations.<\/p>\n<p class=\"isSelectedEnd\">The final enclosure should be selected according to whether the transformer will be installed indoors, outdoors or in an environment requiring additional protection.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Applications_of_480-208Y120V_Transformers\"><\/span>Applications of 480-208Y\/120V Transformers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">480V to 208Y\/120V three-phase transformers can be used in:<\/p>\n<ul data-spread=\"false\">\n<li>Manufacturing plants<\/li>\n<li>Commercial buildings<\/li>\n<li>Industrial workshops<\/li>\n<li>CNC machinery<\/li>\n<li>Automation systems<\/li>\n<li>HVAC systems<\/li>\n<li>Data center infrastructure<\/li>\n<li>Warehouses<\/li>\n<li>Retail facilities<\/li>\n<li>Schools and institutions<\/li>\n<li>Electrical control systems<\/li>\n<li>Industrial distribution panels<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">The 208Y\/120V secondary makes the transformer particularly practical when a facility requires both three-phase 208V equipment and 120V single-phase circuits.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Custom_480V_to_208Y120V_Transformer_Manufacturer\"><\/span>Custom 480V to 208Y\/120V Transformer Manufacturer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">Not every project requires exactly the same transformer configuration. Voltnex Power provides <strong>custom 480V to 208Y\/120V three-phase dry type transformers<\/strong> according to project requirements.<\/p>\n<p class=\"isSelectedEnd\">Available options can include:<\/p>\n<ul data-spread=\"false\">\n<li>1 kVA to 150 kVA and larger capacities<\/li>\n<li>480V primary<\/li>\n<li>208Y\/120V secondary<\/li>\n<li>Copper or aluminum windings<\/li>\n<li>50Hz or 60Hz<\/li>\n<li>Delta or customized primary connection<\/li>\n<li>Wye secondary with neutral<\/li>\n<li>Customized impedance<\/li>\n<li>Voltage taps<\/li>\n<li>Indoor or outdoor enclosure<\/li>\n<li>Floor or wall mounting<\/li>\n<li>Custom dimensions<\/li>\n<li>OEM nameplate and electrical configuration<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">For projects requiring higher capacity, custom voltage combinations or specific enclosure requirements, the transformer can be engineered according to the customer&#8217;s electrical system and installation conditions.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Get_a_480-208Y120_Volt_3_Phase_Transformer_Quote\"><\/span>Get a 480-208Y\/120 Volt 3 Phase Transformer Quote<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">Choosing the correct transformer is not simply a matter of selecting <strong>75 kVA, 30 kVA or 150 kVA<\/strong> from a standard list. The right capacity depends on the actual load, voltage, phase configuration, operating frequency and future power requirements.<\/p>\n<p class=\"isSelectedEnd\">If you are looking for a <strong>480-208Y\/120 volt 3 phase transformer<\/strong>, Voltnex Power can provide customized dry type transformer solutions from smaller capacities such as <strong>1 kVA, 5 kVA, 7.5 kVA and 15 kVA<\/strong> through <strong>30 kVA, 75 kVA, 150 kVA and larger industrial ratings<\/strong>.<\/p>\n<p>Send us your <strong>required kVA, 480V primary configuration, 208Y\/120V secondary requirement, frequency, winding material, enclosure and application<\/strong>. Our engineering team can then recommend a suitable transformer configuration and provide a customized quotation for your project.<\/p>\n\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f280-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"280\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/it\/wp-json\/wp\/v2\/posts\/3281#wpcf7-f280-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\" data-trp-original-action=\"\/it\/wp-json\/wp\/v2\/posts\/3281#wpcf7-f280-o1\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"280\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.1.7\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f280-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" 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Among the available sizes, 75 kVA 480-208Y\/120 volt 3 phase transformers are a particularly useful configuration for commercial and industrial [&#8230;]\n","protected":false},"author":4,"featured_media":3282,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3281","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>480-208Y\/120 Volt 3 Phase Transformer: kVA Sizes &amp; Selection | Voltnex Power<\/title>\n<meta name=\"description\" content=\"Learn about 480-208Y\/120 volt 3 phase transformers, including 75 kVA and other common sizes, applications, load calculations, specifications and custom dry type solutions from Voltnex Power.\" \/>\n<meta name=\"robots\" content=\"index, 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