MEAN WELL USA Inc.
Mean Well LRS-35-5
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Mean Well LRS-35-5 — 35W 5V/7A enclosed switcher
A compact, fanless 5V supply for the low-voltage side of a printer build. The LRS-35-5 delivers a regulated 5V DC at up to 7A (35W) — enough headroom for a Raspberry Pi running Klipper/Mainsail plus a few accessories, an MCU board, RGB/Neopixel strips, small fans, or a panel display. It is not a bed-heater supply; for the 24V printer side (heated bed, hotend, steppers, fans on a Voron or RatRig), use a 24V unit like the LRS-350-24. This is the small companion rail.
What it powers
- Raspberry Pi / SBC — clean isolated 5V instead of a wall-wart, so the Pi shares the printer's single mains inlet and switch. At 7A there's margin for a Pi 4/5 plus a camera and a USB device or two.
- 5V MCU and accessory rail — logic boards, screens, LED lighting, chamber/electronics-bay fans, anything spec'd for 5V.
- Bench / electronics use — adjustable 4.5–5.5V trimmer lets you trim to exactly 5.0V at the load, or nudge slightly to compensate for wire drop.
The form factor — and the honest wiring story
LRS is Mean Well's compact enclosed switcher: a vented sheet-metal box, no fan, low 30mm profile so it tucks into a printer's electronics bay. Cooling is passive free-air convection, so leave airflow around it and don't bury it under cabling.
Connections are a bare screw-terminal block: live, neutral, earth on the input side, +V and −V on the output. There is no IEC inlet, no fuse, and no shroud — that is the installer's job. This unit carries live mains on exposed terminals. To wire it safely you must:
- Add an inline fuse on the live input sized for the supply (the LRS-35 datasheet specifies the fuse rating).
- Bond the case to protective earth — the earth terminal is not optional on a metal-enclosure mains supply.
- Mount it so the terminals are not finger-accessible — inside an enclosure or behind a terminal cover.
- Use correctly gauged wire and proper ferrules/strain relief.
If you're not comfortable terminating mains, have someone who is do this part. Done right it's a clean, single-inlet install; done carelessly it's a shock and fire hazard.
Spec at a glance
- Output: 5V DC, 7A, 35W — adjustable 4.5–5.5V
- Input: 85–264VAC, 47–63Hz (full 35W across the whole range) / 120–373VDC
- Efficiency ~82%, <0.2W no-load draw
- Protections: over-load, over-voltage, short-circuit
- Isolation 3000VAC input-to-output
- Fanless convection, −30 to +70°C
- 99 × 82 × 30mm, ~210g — screw-terminal block
- Mean Well 3-year warranty
Genuine Mean Well. On clearance at the price shown.
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.
Non-defective items: If you are not satisfied with a non-defective item, you may return it for a refund within 30 days of the original purchase date. A 20% restocking fee will be deducted from the refund amount, to offset the time and inconvenience, as I am the sole employee processing the return and restocking the item. The fee also covers the costs associated with processing the return. Refunds for non-defective items will be issued through the original payment method.
Preordered items: Due to the nature of preorders, delivery dates are subject to change. Please keep in mind that, If you have preordered an item, it is not eligible for a refund until after it has arrived at the store. Once the item arrives at the store and is inspected, you may request a refund within 30 days of the original purchase date. Please note that refunds for preordered items may take up to 10 days to be issued.
To initiate a return, please open a ticket on the shop’s discord channel, with your order number and the reason for the return. We will provide you with further instructions on how to return your purchase.
Thank you for shopping with us. If you have any questions or concerns, please don't hesitate to contact me, via Discord.
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.
