{"id":880496,"date":"2025-09-12T11:26:01","date_gmt":"2025-09-12T10:26:01","guid":{"rendered":"https:\/\/www.electronicsweekly.com\/?p=880496"},"modified":"2025-09-12T11:38:16","modified_gmt":"2025-09-12T10:38:16","slug":"300w-baseplate-cooled-psu","status":"publish","type":"post","link":"https:\/\/www.electronicsweekly.com\/news\/products\/power-supplies\/300w-baseplate-cooled-psu-2025-09\/","title":{"rendered":"300W baseplate cooled PSU"},"content":{"rendered":"<p><a rel=\"image\" href=\"https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2025\/09\/12104815\/Relec-Cincon-CBM300S-baseplate-PSU-web.webp\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-880497\" src=\"https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2025\/09\/12104815\/Relec-Cincon-CBM300S-baseplate-PSU-web-300x192.webp\" alt=\"Relec Cincon CBM300S baseplate cooled PSU web\" width=\"300\" height=\"192\" srcset=\"https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2025\/09\/12104815\/Relec-Cincon-CBM300S-baseplate-PSU-web-300x192.webp 300w, https:\/\/static.electronicsweekly.com\/wp-content\/uploads\/2025\/09\/12104815\/Relec-Cincon-CBM300S-baseplate-PSU-web.webp 692w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>CBM300S is a 300W fan-less ac-dc baseplate-cooled PSU, delivering 360W peak, in a 107 x 85 x 20mm brick.<\/p><div class=\"elect-content\" style=\"margin-left: auto; margin-right: auto; text-align: center; \" id=\"elect-1521024751\"><div id=\"x02\">\r\n<script type=\"text\/javascript\"> if ($(window).width() <= 768) { googletag.display('x02'); } <\/script>\r\n<\/div>\r\n<\/div>\n<p>Made by Cinon and available through Relec, the supplies have closed-box construction and can accept power from 90 &#8211; 264Vac or 120 &#8211; 370Vdc.<\/p>\n<p>Different version offer outputs at 12, 15, 24, 28, 36, 48 or 54V. These can be trimmed -5% to +5% with a single external resistor.<\/p><div class=\"elect-post-content-2\" style=\"margin-left: auto; margin-right: auto; text-align: center; \" id=\"elect-306235554\"><div id=\"DFP-EW-InRead1-Mobile\">\r\n<script type=\"text\/javascript\"> if ($(window).width() <= 768) { googletag.display('DFP-EW-InRead1-Mobile'); } <\/script>\r\n<\/div>\r\n<\/div><div class=\"elect-test\" style=\"margin-left: auto; margin-right: auto; text-align: center; \" id=\"elect-1686350414\"><div id=\"DFP-EW-InRead1\">\r\n<script type=\"text\/javascript\"> if ($(window).width() > 768) { googletag.display('DFP-EW-InRead1'); } <\/script>\r\n<\/div>\r\n<BR>\r\n<\/div>\n<p>&#8220;Its slimline profile makes it an excellent fit where space or height is limited, from automation equipment and telecoms to test systems and industrial ITE,&#8221; said Relec.<\/p>\n<p>Peak efficiency is between 92 and 94% depending on model, no-load power is below 500mW, and leakage is \u22640.75mA.<\/p>\n<p>Operation is across -40 to +90\u00b0C and up to 5,000m altitude.<\/p>\n<p>Fitted with the company&#8217;s K-B022 heatsink, derating starts in ambients of 40\u00b0C and no output is available over 80\u00b0C &#8211; although full power is available if the case can be kept below 90\u00b0C. Slightly less output power can be drawn at inputs below 110Vac.<\/p>\n<p>Protections include over-current, over-voltage, over-temperature and short-circuit.<\/p>\n<p>Approvals include IEC\/UL\/EN 62368-1 (3rd edition) and compliance is to EN 55032 Class B for EMC (without external components) and EN50155 for railway use.<\/p>\n<p>Estimated MTBF is 240,000h.<\/p>\n<p>Find the <a rel=\"image\" href=\"https:\/\/www.relec.co.uk\/power\/cbm300s-series\/\" target=\"_blank\" rel=\"nofollow\">CBM300S power supply family on this Relec web page<\/a> &#8211; from which the data sheet and an application note (which is effectively part 2 of the data sheet) can be downloaded.<\/p>\n<p>XP Power introduced some <a rel=\"image\" href=\"https:\/\/www.electronicsweekly.com\/news\/products\/power-supplies\/bf-medical-ac-dc-psus-rated-for-conduction-convection-and-fan-cooling-2025-02\/\">open-frame PSUs with broadly similar specs<\/a> earlier this year<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CBM300S is a 300W fan-less ac-dc baseplate-cooled PSU, delivering 360W peak, in a 107 x 85 x 20mm brick. Made by Cinon and available through Relec, the supplies have closed-box &#8230;<\/p>\n","protected":false},"author":2,"featured_media":880497,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12654,12696,12694,12693,12647,12677],"tags":[13658],"class_list":["post-880496","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-distribution","category-industrial-electronics","category-medical-electronics","category-military-aerospace-electronics","category-power","category-power-supplies","tag-psu-products"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>300W baseplate cooled PSU | Electronics Weekly<\/title>\n<meta name=\"description\" content=\"CBM300S is a 300W fan-less ac-dc baseplate-cooled PSU, delivering 360W peak, in a 107 x 85 x 20mm brick. Made by Cinon and available through Relec, the\" \/>\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.electronicsweekly.com\/news\/products\/power-supplies\/300w-baseplate-cooled-psu-2025-09\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"300W baseplate cooled PSU | Electronics Weekly\" \/>\n<meta name=\"twitter:description\" content=\"CBM300S is a 300W fan-less ac-dc baseplate-cooled PSU, delivering 360W peak, in a 107 x 85 x 20mm brick. 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