{"product_id":"the-lock-keeper-12v-access-control-power-supply","title":"The Lock Keeper | 12V DC Access Control Power Supply, 3A and 5A","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp style=\"margin:0 0 18px;line-height:1.8;\"\u003eAn electric lock is a binary device with an unforgiving power requirement. Under-volt it and the strike releases weakly or hums without opening. Over-drive it and the coil cooks. Between the mains supply and the lock sits a power supply that either does its job invisibly for a decade or becomes the reason a door stops working on a Friday afternoon.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 18px;line-height:1.8;\"\u003eThe Lock Keeper takes AC 90 to 260 volts in and delivers a regulated DC 12 volt output at either 3A or 5A. The wide input range means the same unit works on 110V and 220V supplies without a tap change, which matters for imported equipment and for buildings with uneven distribution. Output is filtered, so the strike does not buzz under load and the controller does not brown out when the lock fires.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 18px;line-height:1.8;\"\u003eThe 3A and 5A decision is straightforward. One lock on the supply is comfortably served by 3A. Two locks, or a lock plus a controller and reader on the same rail, run more stably at 5A because the inrush of a strike is several times its holding current. Both units are housed in a compact case with screw terminals and are intended for mounting inside a secured enclosure near the door.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 18px;line-height:1.8;\"\u003eBoth black and white housings are stocked in each current rating. The unit is designed as a building component rather than a consumer adapter: no barrel plug, no wall-wart cable, just terminals that accept the field wiring an installer is already running.\u003c\/p\u003e\n\u003cp style=\"margin:22px 0 0;line-height:1.8;font-style:italic;color:#555;\"\u003eA door either opens or it does not. Everything interesting happens in the twelve volts between those outcomes.\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin:26px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-features\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:19px;margin:0 0 12px;\"\u003eWhy It Works\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;line-height:1.65;\"\u003e✦ Regulated DC 12V output at 3A or 5A\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;line-height:1.65;\"\u003e✦ Wide AC 90 to 260V input, no voltage tap change needed\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;line-height:1.65;\"\u003e✦ Filtered output stops strike buzz and controller brownout\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;line-height:1.65;\"\u003e✦ Screw terminals for field wiring, no adapter plug\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;line-height:1.65;\"\u003e✦ Compact housing for mounting inside a secured enclosure\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;line-height:1.65;\"\u003e✦ Black and white housings in both current ratings\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;line-height:1.65;\"\u003e✦ Suits electric strikes, magnetic locks and RFID controllers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-specs\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:19px;margin:0 0 12px;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e AC 90-260V, 50\/60 Hz\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e DC 12V regulated\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eCurrent:\u003c\/strong\u003e 3A or 5A versions\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eHousing:\u003c\/strong\u003e Black or white, compact case\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eTermination:\u003c\/strong\u003e Screw terminals\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Electric locks and access controllers\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eFiltering:\u003c\/strong\u003e Yes, stabilised output\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Inside secured enclosure near door\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Electric strikes, maglocks, RFID systems\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;border-bottom:1px solid #f0f0f0;line-height:1.6;\"\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-applications\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:19px;margin:0 0 12px;\"\u003eWhere It Belongs\u003c\/h3\u003e\n\u003cp style=\"margin:0;line-height:1.8;\"\u003eInstallers fitting a single-door strike on a storefront choose the 3A unit and mount it above the ceiling tile next to the reader controller. Multi-door offices run the 5A version where two locks share a rail, avoiding the brownout that shows up as an intermittent reader fault. Integrators replacing failed generic adapters use the wide-input version because it survives sites where the actual mains voltage drifts well below nominal.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-faq\" style=\"margin-top:28px;\"\u003e\n\u003ch3 style=\"font-size:19px;margin:0 0 12px;\"\u003eQuestions Buyers Ask\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:600;\"\u003eQ: Should I choose 3A or 5A?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.7;color:#444;\"\u003eA: One lock is fine on 3A. Two locks, or a lock plus reader and controller, run more stably on 5A because strike inrush is much higher than holding current.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:600;\"\u003eQ: Does it work on 110V and 220V?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.7;color:#444;\"\u003eA: Yes. The AC 90 to 260V input range covers both without any tap change or switch.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:600;\"\u003eQ: Can it power a magnetic lock?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.7;color:#444;\"\u003eA: Yes, provided the lock's holding current plus any controller draw stays inside the unit's rating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:600;\"\u003eQ: Does it include a battery backup?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.7;color:#444;\"\u003eA: No. This is a regulated supply. Backup is provided by a separate UPS or the controller's own battery module.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:600;\"\u003eQ: Where should it be mounted?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.7;color:#444;\"\u003eA: Inside a secured enclosure near the door, on the protected side, with mains wiring done to local code by a qualified electrician.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:600;\"\u003eQ: Will the strike buzz?\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.7;color:#444;\"\u003eA: The output is filtered and stabilised, which removes the buzz that unfiltered supplies produce under strike load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv style=\"margin-top:28px;padding:18px;background:#f7f8fa;border-left:3px solid #1A3A5C;\"\u003e\n\u003ch3 style=\"font-size:17px;margin:0 0 10px;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 8px;line-height:1.7;\"\u003eEvery listing is checked for specification accuracy before it ships. Orders leave the warehouse with tracking, and any item that arrives damaged or out of specification is replaced under our returns policy.\u003c\/p\u003e\n\u003cp style=\"margin:0;line-height:1.7;\"\u003eQuestions about compatibility or sizing are answered by the same team that handles the sourcing, usually within one business day.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-gallery\" style=\"margin-top:30px;text-align:center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S68d966bcddb64247a368c13825f489e8H.webp?v=1723342480\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S511019f6f5594885892b3b091a004967e.webp?v=1723342480\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S7cf3d4f0c6de4444a3eb6d13bbf01059W.webp?v=1723342480\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S9c7f6763e5ef4606ac9ccbf5e0d4b35d2.webp?v=1723342480\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S93871df9549c41ce85e3cda17478bab1o.webp?v=1723342481\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S2b210584864f480e985dab7e085ea1d2Z.webp?v=1723342480\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S19acdda150c34c4395b0b879f4ebc088E.webp?v=1723342480\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S71652e14e31a47b6be777502cb1b9eebI.webp?v=1723342480\" alt=\"The Lock Keeper\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:6px;\" loading=\"lazy\"\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@type\": \"Product\",\n \"name\": \"The Lock Keeper | 12V DC Access Control Power Supply, 3A and 5A\",\n \"description\": \"An electric lock is a binary device with an unforgiving power requirement. Under-volt it and the strike releases weakly or hums without opening. Over-drive it and the coil cooks. 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Two locks, or a lock plus reader and controller, run more stably on 5A because strike inrush is much higher than holding current.\"}},{\"@type\":\"Question\",\"name\":\"Does it work on 110V and 220V?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The AC 90 to 260V input range covers both without any tap change or switch.\"}},{\"@type\":\"Question\",\"name\":\"Can it power a magnetic lock?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, provided the lock's holding current plus any controller draw stays inside the unit's rating.\"}},{\"@type\":\"Question\",\"name\":\"Does it include a battery backup?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. This is a regulated supply. 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