{"product_id":"mean-well-irm-90-48st-power-supply","title":"MEAN WELL IRM-90-48ST Power Supply","description":"\u003ch3\u003eWhat it is\u003c\/h3\u003e\n\u003cp\u003eThe 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 \u003cem\u003einto\u003c\/em\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhat it powers in a printer build\u003c\/h3\u003e\n\u003cp\u003eThis is a 48V unit, so it is for the \u003cstrong\u003e48V rail\u003c\/strong\u003e, 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 \u003cem\u003enot\u003c\/em\u003e 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.\u003c\/p\u003e\n\u003cp\u003eAt 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.\u003c\/p\u003e\n\n\u003ch3\u003eThe honest wiring \u0026amp; safety story\u003c\/h3\u003e\n\u003cp\u003eThis module has \u003cstrong\u003ebare screw terminals carrying live mains\u003c\/strong\u003e 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:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAn \u003cstrong\u003einline fuse\u003c\/strong\u003e on the AC input sized to the module, plus external protection appropriate to your mains.\u003c\/li\u003e\n\u003cli\u003eProper \u003cstrong\u003emains-rated wire\u003c\/strong\u003e, ferrules on stranded conductors, and torque-checked screw terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical protection\u003c\/strong\u003e 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.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is a \u003cstrong\u003eClass II\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhy this form factor\u003c\/h3\u003e\n\u003cp\u003eEncapsulated IRM modules are chosen when you want the supply \u003cstrong\u003eon or beside a PCB\u003c\/strong\u003e, 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.\u003c\/p\u003e\n\n\u003ch3\u003eVerified spec\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e 90.24W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e 48VDC @ 1.88A (2.07A peak)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e 80-305VAC universal, 47-63Hz (also 113-431VDC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficiency:\u003c\/strong\u003e ~93%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo-load draw:\u003c\/strong\u003e \u0026lt;0.21W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 109 x 52 x 33.5mm (4.29 x 2.05 x 1.32in)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e fanless, free-air convection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating temp:\u003c\/strong\u003e -30 to +80C (derate above +50C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtections:\u003c\/strong\u003e short circuit, overload, over-voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation:\u003c\/strong\u003e Class II, over-voltage category III\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety:\u003c\/strong\u003e UL\/TUV\/EN 62368-1, CB, CE, EAC; 3-year Mean Well warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eGenuine Mean Well. On sale now while stock lasts.\u003c\/p\u003e","brand":"MEAN WELL USA Inc.","offers":[{"title":"Default Title","offer_id":43668321501406,"sku":"9339449062","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0556\/9767\/0313\/products\/e.jpg?v=1668675030","url":"https:\/\/formosissima.myshopify.com\/products\/mean-well-irm-90-48st-power-supply","provider":"dfh.fm","version":"1.0","type":"link"}