{"id":19291,"date":"2026-10-17T11:15:18","date_gmt":"2026-10-17T03:15:18","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/ms-25w-miniature-supply-for-junction-boxes\/"},"modified":"2026-10-17T11:15:18","modified_gmt":"2026-10-17T03:15:18","slug":"ms-25w-miniature-supply-for-junction-boxes","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/","title":{"rendered":"MS-25W Miniature Supply for Junction Boxes: Specify the Complete Assembly"},"content":{"rendered":"<article>\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\">\u00cdndice<\/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=\"Alternar \u00edndice de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/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-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.wehopower.com\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#MS-25W_Miniature_Supply_for_Junction_Boxes_Specify_the_Complete_Assembly\" >MS-25W Miniature Supply for Junction Boxes: Specify the Complete Assembly<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Define_the_load_before_choosing_the_box\" >Define the load before choosing the box<\/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\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Build_an_assembly_envelope_not_a_chassis_outline\" >Build an assembly envelope, not a chassis outline<\/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\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Do_not_hide_the_thermal_problem_inside_a_small_enclosure\" >Do not hide the thermal problem inside a small enclosure<\/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\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Make_sample_acceptance_reproducible\" >Make sample acceptance reproducible<\/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\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Send_a_complete_junction-box_RFQ\" >Send a complete junction-box RFQ<\/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\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Buyer_questions\" >Buyer questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.wehopower.com\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Can_an_84_%C3%97_58_%C3%97_38_mm_cavity_be_used_as_the_finished_box_size\" >Can an 84 \u00d7 58 \u00d7 38 mm cavity be used as the finished box size?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.wehopower.com\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Does_the_MS-25_family_name_make_every_version_interchangeable\" >Does the MS-25 family name make every version interchangeable?<\/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\/pt\/news\/ms-25w-miniature-supply-for-junction-boxes\/#Is_a_vented_metal_supply_suitable_for_an_exposed_wet_junction_box\" >Is a vented metal supply suitable for an exposed wet junction box?<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"MS-25W_Miniature_Supply_for_Junction_Boxes_Specify_the_Complete_Assembly\"><\/span>MS-25W Miniature Supply for Junction Boxes: Specify the Complete Assembly<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<figure data-image-role=\"application_a\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/01-application-a-96.png\" alt=\"MS-25W Miniature Supply for Junction Boxes: Specify the Complete Assembly  title=\" width=\"1536\" height=\"1024\" ms-25w miniature supply for junction boxes: specify the complete assembly title=\"\"><figcaption>Conceptual carton-counter auxiliary compartment with a continuous mounting floor and separate wire routing. This is not a verified operating installation.<\/figcaption><\/figure>\n<p>A miniature supply can simplify a small junction box, but it should be purchased as part of a defined assembly, not selected by whether its metal case fits between two walls. For the pictured WEHO MS-25-12, start with the documented 84 \u00d7 58 \u00d7 38 mm chassis and the sample\u2019s 12 V, 2.1 A output. Then allow for cable bends, terminal access, protective measures and the temperature inside the closed box.<\/p>\n<p>This approach suits OEM buyers specifying an auxiliary low-voltage branch for counters, interfaces or small control circuits. It does not establish suitability for a motor, a safety function or an outdoor enclosure without the corresponding load and installation assessment.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Define_the_load_before_choosing_the_box\"><\/span>Define the load before choosing the box<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Record the receiver\u2019s permitted voltage range and current in every relevant state: idle, normal operation, startup and simultaneous activation. A current budget based only on average consumption can miss a brief demand that resets the equipment. Include future accessories explicitly instead of treating unused nameplate capacity as a general expansion allowance.<\/p>\n<p>The supplied MS-25W sheet lists 12 V and 0\u20132.1 A for MS-25-12. The photographed nameplate also states 2.1 A. The <a href=\"https:\/\/www.wehopower.com\/pt\/product\/small-size-25w-ac-dc-power-supply\/\">MS-25 product page<\/a> currently has different figures in its 12 V table, so a purchase order should identify the approved sample, output current and matched specification revision. Do not substitute the web table\u2019s 5 A entry for the photographed rating.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Build_an_assembly_envelope_not_a_chassis_outline\"><\/span>Build an assembly envelope, not a chassis outline<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead>\n<tr>\n<th>Layout item<\/th>\n<th>What the OEM should define<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chassis and fixing<\/td>\n<td>Use the matching 84 \u00d7 58 \u00d7 38 mm drawing and original base holes; do not assume a DIN clip.<\/td>\n<\/tr>\n<tr>\n<td>Terminal side<\/td>\n<td>Reserve space for conductors, the amber guard, inspection and the actual termination tool.<\/td>\n<\/tr>\n<tr>\n<td>Cable entry<\/td>\n<td>Specify glands and strain relief so external cable forces are not carried by the supply terminals.<\/td>\n<\/tr>\n<tr>\n<td>Cover and adjacent parts<\/td>\n<td>Check the fully closed cover, wire-duct lid and protective arrangement with the harness installed.<\/td>\n<\/tr>\n<tr>\n<td>Ventilation<\/td>\n<td>Keep vents unobstructed and obtain the offered revision\u2019s clearance and thermal instructions.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The five front connections separate AC input, protective earth and the DC output pair. They are not five independent output channels. Terminal guards are part of the component construction, not evidence that the finished box meets a particular ingress or touch-protection requirement. A qualified equipment designer should select the enclosure and electrical protection for the intended installation.<\/p>\n<figure data-image-role=\"product_detail\"><img decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/03-product-detail-92.png\" alt=\"MS-25W Miniature Supply for Junction Boxes: Specify the Complete Assembly  title=\" width=\"1536\" height=\"1024\" ms-25w miniature supply for junction boxes: specify the complete assembly title=\"\"><figcaption>The original MS-25-12 has five front terminals and an amber guard. Wiring access and enclosure protection require additional space.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Do_not_hide_the_thermal_problem_inside_a_small_enclosure\"><\/span>Do not hide the thermal problem inside a small enclosure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A supply that fits geometrically may still be unsuitable thermally. The relevant operating condition is the air around the supply in the closed assembly, including heat from neighboring components, not the room temperature beside an open prototype. A sealed box, accumulated dust or a tightly packed harness can change that condition.<\/p>\n<p>The supplied sheet gives a working-temperature range of \u221210\u00b0C to +50\u00b0C. Treat that as a component-document condition, not a guarantee of full output in every enclosure. Request the load-versus-temperature instructions for the offered revision and use a representative assembly for sample assessment. Do not assign a universal clearance or an extra power rating from appearance alone.<\/p>\n<figure data-image-role=\"application_b\"><img decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/02-application-b-93.png\" alt=\"MS-25W Miniature Supply for Junction Boxes: Specify the Complete Assembly  title=\" width=\"1536\" height=\"1024\" ms-25w miniature supply for junction boxes: specify the complete assembly title=\"\"><figcaption>A different protected electrical compartment illustrates chassis fixing and harness access. The scene is not a tested customer installation.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Make_sample_acceptance_reproducible\"><\/span>Make sample acceptance reproducible<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before pilot production, agree on the exact model, label artwork, terminal configuration, fixing pattern and approved document revision. Assemble the sample using the production harness and enclosure. The acceptance plan should cover voltage at the receiver, startup behavior, expected switching loads, closed-cover temperature and practical service access. Define pass criteria from the load requirements and applicable equipment rules before testing.<\/p>\n<p>For a replacement supply, compare more than nominal voltage. A different terminal order, greater height, changed fixing hole or revised thermal instruction can require a new harness or enclosure assessment. Retain a reference sample and control these changes in the bill of materials; do not accept an electrically similar item as an automatic drop-in replacement.<\/p>\n<figure data-image-role=\"engineering_context\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/04-engineering-context-96.png\" alt=\"MS-25W Miniature Supply for Junction Boxes: Specify the Complete Assembly  title=\" width=\"1536\" height=\"1024\" ms-25w miniature supply for junction boxes: specify the complete assembly title=\"\"><figcaption>Use the chassis drawing to start the layout, then validate the wired, closed enclosure under the specified load and environment.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Send_a_complete_junction-box_RFQ\"><\/span>Send a complete junction-box RFQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.wehopower.com\/pt\/contact\/\">Send WEHO the assembly requirements<\/a>: supply input and site conditions, required 12 V load profile, internal enclosure dimensions, a layout drawing, ambient range, protection requirements, sample quantity, expected order volume and delivery destination. Ask for the offered revision\u2019s drawing, terminal instructions and applicable supporting documents. Price, order quantity and delivery schedule should be confirmed in the quotation rather than assumed from a family description.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Buyer_questions\"><\/span>Buyer questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Can_an_84_%C3%97_58_%C3%97_38_mm_cavity_be_used_as_the_finished_box_size\"><\/span>Can an 84 \u00d7 58 \u00d7 38 mm cavity be used as the finished box size?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Those are chassis dimensions. The completed installation also needs wiring, access, protection and the thermal arrangement required for its actual operating conditions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_the_MS-25_family_name_make_every_version_interchangeable\"><\/span>Does the MS-25 family name make every version interchangeable?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Match the full voltage suffix, label and document revision. The pictured MS-25-12 is the 12 V, 2.1 A sample used here; other variants and conflicting table entries must not be merged into that identity.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_a_vented_metal_supply_suitable_for_an_exposed_wet_junction_box\"><\/span>Is a vented metal supply suitable for an exposed wet junction box?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Not on the evidence of its case alone. Specify the complete environmental enclosure and assess the finished assembly; the photographs do not establish a wet-location rating.<\/p>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>The 84 \u00d7 58 \u00d7 38 mm MS-25-12 is a compact chassis, not a complete junction-box design. Define load, enclosure and acceptance criteria before ordering.<\/p>","protected":false},"author":2,"featured_media":19287,"parent":0,"menu_order":51,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[149,284],"class_list":["post-19291","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-blog","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news\/19291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/comments?post=19291"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news\/19291\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/media\/19287"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/media?parent=19291"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/pt\/wp-json\/wp\/v2\/news_category?post=19291"}],"curies":[{"name":"wp ent\u00e3o","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}