Product Overview
Melcher LM 1301-7R Switched-Mode Power Converter 12VDC 4A
Condition
Used. Evaluation: Visual inspection only. Function testing not performed. Includes the detached ERNI mating wiring connector with pigtail leads and four mounting screws. Markings legible: Melcher LM 1000 Mk II, LM 1301-7R, Input 88-372VDC 85-264VAC 47-440Hz, Output 1: 12V 0-4A, IP 40. Minor surface handling marks on outer metal cassette enclosure.
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Product Overview
Melcher model LM 1301-7R is an enclosed switched-mode AC-DC and DC-DC power supply module from the LM 1000 Mk II series. Designed for rugged industrial and transit electronics, the Euro-cassette enclosure features a wide universal input range supporting 85 to 264 VAC or 88 to 372 VDC. It provides a single regulated 12 VDC output rated from 0 to 4 A (up to 48 W continuous power). Front-accessible status LEDs indicate operation, inhibit state, and current limit status.
Key Features
- Output rating: 12 VDC, 0 to 4 A
- AC input range: 85 to 264 VAC, 47 to 440 Hz
- DC input range: 88 to 372 VDC
- Enclosure protection rating: IP40
- Panel-accessible primary fuse rated T 2.5 A 250 V
- DIN multi-pin interface with mating ERNI connector and wire harness
- Front status indicators for OK, inhibit (i), and output current limit (IoL)
- Rugged metal Euro-cassette housing with heat-dissipating side fins
Applications
- Swapping out failed 12V power modules in industrial rack systems and automation cabinets
- Powering remote instrumentation nodes operating directly from high-voltage DC battery banks
- Bench power supply builds for hobbyists needing clean 12V power from unpredictable line or DC sources
Frequently Asked Questions
Does this converter require an external jumper to operate?
Yes. The faceplate pinout specifies connecting pin 2 to pin 23 when the inhibit function is unused to allow normal operation.
What hardware is included with this converter module?
It comes with the pictured ERNI edge connector harness with pre-wired flying leads and four pan-head mounting machine screws.
What should I verify about the wiring harness before installation?
The included mating connector retains wire leads from previous equipment. Inspect and trace the individual wire terminations to confirm your connections match the pinout diagram printed on the top faceplate.
Swiss-built power bricks from this era were made to shrug off dirty line voltage and run quietly in the back of a rack for decades. Drop in your connections, tie off the inhibit line, and put those steady twelve volts back to work.
