MEAN WELL USA Inc.
Mean Well LRS-350-24 - 350W 24V 14.6A Power Supply (Voron / Klipper)
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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.
Shipping & Returns
Returns:
Thank you for purchasing from dfh.fm. I want you to be completely satisfied with your purchase. If for any reason you are not satisfied, you may return your purchase within 60 days of the original purchase date.
Defective items: Please inspect items upon receipt. If you receive a defective item, you may return it for a full refund or replacement within 90 days of the original purchase date. Please contact me to initiate a return for a defective item.
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Order alterations and cancellations:
Once an order has ben submitted, no alterations can be made. This includes adding or removing items or canceling orders. You are welcome to return an order, once you have taken receipt, following the returns procedure listed above.
Shipping:
US Shipping is via UPS or USPS. The way it is set up shows the least expensive options for standard, priority and express shipping. I can not take special requests for specific carriers at this time.
International shipping is mostly UPS, as I utilize Zonos/UPS integration to tally extremely accurate import and shipping costs.
I require a telephone and email with international orders and you must make yourself available to the carrier or your customs, should they require more information. If you are unreachable and the package is discarded or rerturned, I will not be responsible for rerturning your shipping cost.
If there is a problem with an international order, it is my choice to refund part or all of the order, or send a replacement.
Addresses are verified through Shopify, but the customer is still responsible for inputting their address in the correct format. Any returns or lost shipments, due to incorrectly addressed packages, are the responsibility of the customer.
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