MEAN WELL USA Inc.
Mean Well LRS-150-48
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Mean Well LRS-150-48 — 150W 48V 3.3A enclosed switching PSU
A fanless, low-profile (1U / 30mm) enclosed switching supply from Mean Well's LRS line. 48V DC out, 3.3A, 158.4W maximum. This is the silent, compact brick you bolt into a printer base or control cabinet and forget about.
Read this first: the 48V variant is not the standard printer part
Most 3D printers — Voron, RatRig, the common Klipper/Ender builds — run their bed heater, mainboard, and electronics on 24V. That is the Voron standard. This is the 48V unit, which is a different animal:
- It is for high-voltage stepper drivers and industrial loads, not a 24V bed heater. Some builders run steppers at 48V for higher top speed and acceleration headroom (driver permitting — check your driver's max input, e.g. TMC5160-class), and 48V is common in CNC and industrial gear.
- Do not wire a 24V bed heater, 24V hotend, 24V fans, or a 24V mainboard to this. Feeding 48V into 24V-rated hardware will destroy it. If you came here for a standard Voron/Klipper bed + electronics supply, you want the LRS-150-24 (or a larger 24V unit sized to your bed), not this part.
- For powering a Raspberry Pi / SBC / MCU, you want a 5V supply (or a buck converter), not this.
Bought with eyes open, the LRS-150-48 is a clean, proven 48V rail. Bought by mistake, it's a fast way to let the magic smoke out of your electronics. We'd rather you know.
The wiring and safety reality (bare mains terminals)
This is an open-frame-style enclosed supply with a screw-terminal block, not a sealed wall-wart. Live AC mains lands on exposed screw terminals (Line / Neutral / Earth) right next to the DC output terminals (+V / -V). That means:
- You are responsible for the mains side. You provide the AC cabling, strain relief, an inline fuse on the Line conductor, and a proper earth (ground) connection to the chassis. None of that is included.
- The terminals are touch-live when powered. Mount it inside an enclosure or behind a guard so nobody can contact the AC terminals. Set the 115/230V input switch correctly for your mains before first power-on — wrong position on 230V mains can damage the unit.
- If you're not comfortable terminating mains AC, fusing it, and earthing the chassis, this is not the right product for you — buy a sealed external brick instead. There's no shame in it.
Why this form factor
The LRS series is the go-to for printer and cabinet builds because it's fanless (convection cooled — no fan to fail, no fan noise) and thin (30mm tall), so it tucks into a printer base or DIN-adjacent control area without a tower-sized footprint. ~90% efficient, wide 85-264VAC input, and the usual Mean Well protection set: over-voltage, overload, over-temperature, and short-circuit. UL/TUV/CB/CE listed, 3-year warranty from Mean Well.
Honest spec notes
- Full output across the input range: the full 3.3A / 158.4W is available over the entire 85-264VAC input, on both the 115V and 230V switch settings. (On 115V mains the AC input current is roughly double that on 230V — normal P=VI behavior — but the DC output is not derated.)
- Thermal derating: rated to +70C ambient, but you lose available current above roughly +50C. Convection cooling means airflow and orientation matter inside a hot enclosure.
- Single output: one 48V rail, adjustable a few percent (43.2-52.8V) via the onboard trim pot.
On clearance — solid Mean Well silicon at a clearance price. Just make sure 48V is actually the rail your build needs before you buy.
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.
