Mean Well LRS-350-24 - 350W 24V 14.6A Power Supply (Voron / Klipper)

Mean Well LRS-350-24 — 350W 24V 14.6A enclosed switching PSU This is the workhorse 24V supply for a Voron, RatRig, or any Klipper-driven machine. At 24Vdc and 14.6A (350.4W) it has the headroom to run a mains-class build's full DC side: the bed heater, the control board and steppers, the hotend cartridge, and the part-cooling and electronics fans — all from one brick. 24V is the Voron standard because it lets the bed heater and motors pull current at half the amperage 12V would need, which keeps wire gauge and connector heating sane. What it powers Bed heater — a 24V silicone/PCB bed heater is the biggest single load; the LRS-350-24's 14.6A continuous rating covers a 200×200 to 300×300 bed plus everything else without sitting at 100%. Control board + steppers + hotend — SKR, Octopus, BTT, Spider-class boards take 24V in and regulate down for the MCU and drivers. The hotend heater cartridge runs straight off the 24V rail. Fans and accessories — 24V fans wire directly; 5V accessories (Raspberry Pi / SBC) need a separate 5V supply or a buck converter — do not run a Pi off this unit's 24V rail directly. The wiring and safety reality (read this) This is a bare-terminal mains supply. The left-hand screw terminals are live AC: L, N, and earth (⏚). You are responsible for everything upstream of them: Set the voltage switch first. The 115/230 slide switch must match your wall voltage. On 230V mains with the switch left at 115, you will destroy the unit instantly. North America = 115; most of Europe/AU = 230. Fuse the mains side. Use a fused, switched IEC inlet or an inline fuse on L. The LRS has internal protection on its outputs, not branch-circuit protection on its input. Bond earth. The metal case must connect to mains earth at the ⏚ terminal. This is not optional on a metal-frame printer. Cover the terminals. Exposed mains screw terminals belong inside an enclosed electronics bay with a terminal cover or shroud — never reachable while powered. Strain-relief and ferrule. Ferrule the stranded conductors and strain-relieve both the mains cord and the DC leads so a tug can't back a wire out of a terminal. If you're not comfortable terminating mains wiring to screw terminals, this is the part to slow down on or get a second set of eyes for. The DC side (24V V+/V−) is harmless to handle; the AC side is not. Why this form factor The LRS series is the slim 30mm enclosed family — the volume baseline that most Voron/Klipper kits are designed around, and the cheapest way into a clean 24V build. It is not dead-silent: the 350W tier carries a small thermostatic fan that only spins when the internal sensor crosses ~50°C, so under light printing loads it typically stays off and runs on convection. If you want a guaranteed-fanless or DIN-rail-clean install, that's the HDR (ultra-slim DIN rail) or UHP (slim, PFC, premium) families — they comp higher than this one. For a standard enclosed bay mount at the best price, the LRS-350-24 is the right call. Key specs Output: 24Vdc, 14.6A, 350.4W Input: 90–132 / 180–264VAC switch-selectable (85–264VAC), 240–370VDC, 47–63Hz Efficiency: 88% typ. Size: 215 × 115 × 30 mm Temp: −25 to +70°C operating (derate above 50°C) Protections: OVP 28.8–33.6V, overload 110–140%, OTP — all hiccup/auto-recover Safety: IEC/UL 62368-1, overvoltage category III, altitude to 5000m On sale as a clearance item — same part, same Mean Well datasheet, lower price.