Mean Well HDR-60-5

Mean Well HDR-60-5 — 5V 6.5A (32.5W) DIN-rail PSU

An ultra-slim DIN-rail supply that turns mains into a clean 5V/6.5A rail. In a 3D-printer build this is the low-voltage / logic supply, not the main motion supply. It runs a Raspberry Pi (Klipper host), an MCU board, a small display, LED strips, fans, or other 5V accessories that you want on a dedicated rail instead of stealing current from the toolboard or a USB brick.

It does not power a 24V bed heater or 24V steppers — for that you want a 24V unit (the Voron standard). Pair this with your 24V main supply when you want the Pi and electronics on their own isolated, properly-fused source.

Why the HDR form factor

HDR is Mean Well's ultra-slim "step-shape" DIN-rail line. It clips onto standard 35mm DIN rail (TS-35/7.5 or TS-35/15), so if your printer's electronics bay or control cabinet is built around a rail, this drops in clean next to your terminal blocks and breakers — no standoffs, no open-frame chassis to mount. The 52.5mm-wide (3SU) body is narrow, fanless, and silent. Compared to an open-frame LRS brick, you pay a bit more for the cabinet-grade packaging and the tidy rail mount.

The honest wiring / safety reality

This is a bare-terminal mains unit. Live AC (L/N) lands on exposed screw terminals on one end; 5V DC comes off screw terminals on the other. That means:

• You are responsible for the mains side. It needs an appropriately-rated inline fuse and proper mains wiring (correctly-gauged, strain-relieved, ferrules on stranded conductors). Nothing here is "plug and play."
• Class II / no earth pin. The HDR series is double-insulated — there is no protective-earth (PE) terminal on the unit itself. Earth your chassis/enclosure separately per your build's grounding scheme; do not assume the PSU bonds your frame.
• Mount it where terminals can't be touched. DIN-rail supplies live inside an enclosure for a reason. Keep the AC terminals covered/inaccessible in the finished build.
• If you're not comfortable terminating mains, stop and get someone who is. The DC side is harmless; the AC side will hurt you.

Spec at a glance

• Output: 5V DC, 6.5A, 32.5W
• Input: 85-264VAC universal, 47-63Hz
• Efficiency ~85% (typ.), fanless free-air cooling
• Operating temp -30C to +70C
• Output adjustable ~5.0-5.5V (up to ~+10%) via onboard trimmer
• Short-circuit / over-current (hiccup) / over-voltage protection
• Mounts on TS-35 DIN rail; 52.5 x 90 x 54.5mm (W x H x D); ~0.19kg
• 3-year Mean Well warranty

This unit is on sale as part of a clearance — same genuine Mean Well part, lower price.