MEAN WELL USA Inc.
MEAN WELL IRM-90-48ST Power Supply
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What it is
The Mean Well IRM-90-48ST is a 90W, 48V encapsulated AC-DC module from the IRM-90 series. Unlike the open-frame LRS brick or a DIN-rail HDR, this is a potted "green power module" designed to be built into a board or panel: a sealed block with screw terminals, 80-305VAC universal input, and no fan. It sits in the middle of Mean Well's lineup — a step up from the little 5V IRM/IRM-bricks, below the slim DIN-rail HDR units and the PFC-equipped UHP supplies.
What it powers in a printer build
This is a 48V unit, so it is for the 48V rail, not the bed. In a Voron / Klipper / RatRig build that means feeding stepper drivers and motors that run at 48V (high-torque setups, fast travel moves, CoreXY toolhead steppers) through your control board or a dedicated 48V stepper supply input. It does not power a 24V bed heater or 24V electronics, and it does not power a 5V Raspberry Pi. If your printer is a standard 24V build, this is the wrong voltage — match it to a board and steppers actually specified for 48V.
At 1.88A / 90W it is sized for the stepper rail of a single machine, not a whole 350mm bed. Check your driver count and current draw before assuming it covers everything.
The honest wiring & safety story
This module has bare screw terminals carrying live mains on the AC side. There is no enclosure, no IEC inlet, no fuse, and no strain relief in the box — that is your job. To wire it safely you need to provide:
- An inline fuse on the AC input sized to the module, plus external protection appropriate to your mains.
- Proper mains-rated wire, ferrules on stranded conductors, and torque-checked screw terminals.
- Mechanical protection so nobody can touch the live terminals — this is a potted module, but the screw heads are exposed. Mount it where the AC side is enclosed or covered.
This is a Class II supply: double-insulated, so there is no protective-earth requirement on the output side the way an earthed metal-case LRS has. That does not make the mains side safe to touch — 80-305VAC is still lethal. If you are not comfortable terminating mains, this is not the part to learn on.
Why this form factor
Encapsulated IRM modules are chosen when you want the supply on or beside a PCB, sealed against dust and vibration, running silently with no fan to fail. The potting makes it more rugged than an open LRS and tolerant of the rough environment inside a moving printer. The trade-off versus a DIN-rail HDR is that it does not clip into a control cabinet — it bolts down by its mounting holes and you build the surrounding protection yourself.
Verified spec
- Power: 90.24W
- Output: 48VDC @ 1.88A (2.07A peak)
- Input: 80-305VAC universal, 47-63Hz (also 113-431VDC)
- Efficiency: ~93%
- No-load draw: <0.21W
- Size: 109 x 52 x 33.5mm (4.29 x 2.05 x 1.32in)
- Cooling: fanless, free-air convection
- Operating temp: -30 to +80C (derate above +50C)
- Protections: short circuit, overload, over-voltage
- Insulation: Class II, over-voltage category III
- Safety: UL/TUV/EN 62368-1, CB, CE, EAC; 3-year Mean Well warranty
Genuine Mean Well. On sale now while stock lasts.
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.
