{"product_id":"mercury-13-8v-5-4a-74w-switch-mode-psu","title":"Mercury 13.8V 5.4A 74W Switch Mode PSU","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Mercury is a 13.8V 5.4A switch mode power supply delivering up to 74W of continuous DC output via screw terminals on the rear panel. The 13.8V output voltage matches the fully charged state of a 12V lead-acid battery, allowing the PSU to power 12V devices directly or to maintain a 12V battery system under constant charge without over-voltage damage.\u003c\/p\u003e\n\u003cp\u003eDesigned for radio communications, alarm and security systems, access control installations, LED signage and monitoring equipment, the PSU provides a single output channel suitable for powering devices drawing up to 5.4A. Built-in short-circuit protection cuts the output if a fault is detected, while overload protection prevents damage from excessive current draw. Both protections reset automatically once the fault condition is cleared, avoiding manual intervention in most cases.\u003c\/p\u003e\n\u003cp\u003eThe compact 110 x 80 x 35mm enclosure with perforated steel casing allows convection cooling and weighs 220g, making it suitable for confined equipment racks, control panels and wall-mounted installations where space is limited. The IP20 rating makes it suitable for indoor use only. Mains input is via a standard 240V AC 50Hz connection rated at 1.3A, and the voltage regulation holds output within 12.42V to 15.18V under varying load conditions.\u003c\/p\u003e\n\u003cp\u003eInstallation uses screw terminals for both mains input and DC output, compatible with standard single-core or stranded wire up to 2.5mm². The working temperature range of -10°C to +40°C covers most indoor environments including unheated equipment rooms and loft spaces, though ventilation around the unit should be maintained to prevent thermal stress under sustained maximum load.\u003c\/p\u003e\n\u003ch5\u003eSpecification\u003c\/h5\u003e\n\u003ctable class=\"spec_table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput voltage\u003c\/td\u003e\n\u003ctd\u003e13.8Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIP rating\u003c\/td\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage range\u003c\/td\u003e\n\u003ctd\u003e12.42V-15.18V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking temperature\u003c\/td\u003e\n\u003ctd\u003e-10~40°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply\u003c\/td\u003e\n\u003ctd\u003e240Vac\/1.3A, 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower : max.\u003c\/td\u003e\n\u003ctd\u003e74.52W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput current\u003c\/td\u003e\n\u003ctd\u003e5.4A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e110x35x80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.22kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput channels\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch5\u003eDownloads\u003c\/h5\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/650756UK.pdf\" target=\"_blank\"\u003eProduct Manual\u003c\/a\u003e\u003c\/p\u003e\n\u003ch5\u003eFrequently Asked\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the output 13.8V instead of 12V?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 13.8V output matches the fully charged voltage of a 12V lead-acid battery, allowing the PSU to maintain a battery system under float charge without over-voltage damage. 12V devices are designed to tolerate this voltage range and will operate normally on 13.8V.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it power devices rated at exactly 12V?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Most 12V devices including radios, access control panels, LED drivers and monitoring equipment are specified to operate across a range of 10.8V to 15V, so the 13.8V output is well within tolerance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if the load exceeds 5.4A?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe overload protection cuts the output to prevent damage to the PSU. Once the excessive load is removed the PSU resets automatically and resumes normal operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for outdoor use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The IP20 rating means the PSU has no protection against moisture ingress and is suitable for indoor installations only. For outdoor applications a weatherproof enclosure would be required.\u003c\/p\u003e","brand":"AVSL","offers":[{"title":"Default Title","offer_id":45313448444171,"sku":"650.756UK","price":12.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8993\/3835\/files\/650756UK_CO1_458aecdf-c9eb-43aa-a068-6c7de711063c.jpg?v=1715193128","url":"https:\/\/niori.co.uk\/products\/mercury-13-8v-5-4a-74w-switch-mode-psu","provider":"Niori","version":"1.0","type":"link"}