{"product_id":"mean-well-lrs-100-5","title":"Mean Well LRS-100-5","description":"\u003ch2\u003eMean Well LRS-100-5 — 5V 18A (90W) enclosed switching supply\u003c\/h2\u003e\n\u003cp\u003eThis is the small, low-voltage member of Mean Well's \u003cstrong\u003eLRS enclosed metal-case family\u003c\/strong\u003e — the same fanless, screw-terminal switcher line as the LRS-350-24 that powers Voron beds, but configured for \u003cstrong\u003e5V at 18A\u003c\/strong\u003e instead of 24V. In a 3D-printer build this is the supply you reach for when you need a clean, dedicated 5V rail: a Raspberry Pi (or CB1\/CM4) running Klipper, an MCU\/control board's logic supply, LED strips, fans, or other 5V accessories. It is \u003cem\u003enot\u003c\/em\u003e a bed-heater supply — for the heated bed and 24V electronics on a Voron\/RatRig you want a 24V LRS unit. Use this alongside one.\u003c\/p\u003e\n\n\u003ch3\u003eThe real spec (read the part number carefully)\u003c\/h3\u003e\n\u003cp\u003eDespite the \"100\" in the name, the 5V model is rated \u003cstrong\u003e90W, not 100W\u003c\/strong\u003e: 5V x 18A = 90W. Mean Well derates the low-voltage members of the LRS-100 series, so you get \u003cstrong\u003e18A at 5V\u003c\/strong\u003e, not 20A. Plan your load budget around 90W \/ 18A. A Pi 4 under load plus a few 5V fans and an LED strip sits comfortably inside that; this supply has plenty of headroom for typical printer 5V duties.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e 5V DC, 18A, 90W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e 85-264 VAC full range (no voltage-select jumper) or 120-370 VDC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency:\u003c\/strong\u003e ~86%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e free-air convection — fanless and silent, no fan to fail or add noise to the enclosure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 129 x 97 x 30 mm — the 30 mm low-profile case, easy to tuck into an electronics bay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtections:\u003c\/strong\u003e short circuit, overload, over-voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput trim:\u003c\/strong\u003e on-board SVR pot for fine 5V adjustment if you need to compensate for wire drop\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety\/EMC:\u003c\/strong\u003e UL\/CUL, TUV, CB, CE\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWiring and safety — this is a bare-terminal mains unit\u003c\/h3\u003e\n\u003cp\u003eBe clear-eyed about what you're buying: the LRS is an \u003cstrong\u003eopen-frame-style enclosed supply with exposed screw terminals\u003c\/strong\u003e, not a sealed wall-wart. The input side carries \u003cstrong\u003elive mains voltage\u003c\/strong\u003e on a screw terminal block. You are responsible for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMains wiring to the AC terminals\u003c\/strong\u003e (L, N, earth\/⏚). Earth\/ground \u003cem\u003emust\u003c\/em\u003e be connected to the metal case — this is non-negotiable for safety.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpstream fusing and a means of disconnect.\u003c\/strong\u003e The LRS has internal short-circuit protection on its output, but it does \u003cem\u003enot\u003c\/em\u003e replace a properly rated mains fuse or breaker on the input. Fuse it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrain relief and a terminal cover.\u003c\/strong\u003e A clear plastic terminal guard is included; fit it. Don't leave live screw terminals exposed inside a printer enclosure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're not comfortable terminating mains-voltage screw terminals and fusing an AC input, have someone who is do the install. This is standard practice for every LRS\/HDR-class supply — it's the trade-off for the compact, cheap, field-serviceable form factor.\u003c\/p\u003e\n\n\u003ch3\u003eWhy this form factor\u003c\/h3\u003e\n\u003cp\u003eThe enclosed LRS case is the workhorse choice for printer builds: a vented steel shell, convection cooling (no fan noise), screw terminals you can actually service, and a price that's hard to argue with. The slim 30 mm height makes it easy to mount flat in an electronics compartment. If you instead want a clean DIN-rail control-cabinet install, look at the HDR (ultra-slim DIN) or UHP (slim, PFC, kit-grade) families; for a fully encapsulated PCB-mount module there's the IRM series. For a 3D printer's 5V accessory rail, the LRS-100-5 is the straightforward, proven pick.\u003c\/p\u003e\n\n\u003ch3\u003eOn the price\u003c\/h3\u003e\n\u003cp\u003eThis unit is on clearance. For reference, hobby\/maker resellers list the LRS-100-5 around $27 (ProtoSupplies $26.95); component distributors like Digi-Key are lower at ~$18.60 in single quantity because they don't carry it as a niche printer part. Our clearance price sits between the two — a fair maker-channel price on the way out the door.\u003c\/p\u003e","brand":"MEAN WELL USA Inc.","offers":[{"title":"Default Title","offer_id":44779820679390,"sku":null,"price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0556\/9767\/0313\/files\/LRS-100-5.jpg?v=1707757477","url":"https:\/\/formosissima.myshopify.com\/products\/mean-well-lrs-100-5","provider":"dfh.fm","version":"1.0","type":"link"}