General Electric Multilin UR-1HH Power Supply Module

GE Multilin UR 1HH Power Supply Module

The GE Multilin UR 1HH is the original high‑voltage power‑supply module used in Universal Relay (UR) systems. It provides operating power to the relay chassis and supports auxiliary dry‑contact input powering. As part of the UR modular architecture, the UR‑1HH installs behind the relay’s hinged faceplate and can be replaced without disturbing other modules—provided control power is fully removed.

Hardware Specifications

Functional Description

The UR‑1HH is the high‑power version of the UR power‑supply family. It supports both AC and DC high‑voltage inputs, unlike the low‑voltage UR‑1LH module (24–48 V DC only). The UR‑1HH powers:

• The relay’s internal processor and logic
• Communication modules
• Digital I/O modules
• Auxiliary dry‑contact inputs

The relay’s hinged front panel allows easy access to the module. Removal and replacement require:

• Disconnecting control power
• Pulling the retaining clips
• Sliding the module out of its slot
• Inserting a like‑for‑like replacement

Electrostatic discharge precautions (e.g., wrist strap) are recommended whenever handling modules.

Design Notes & Generational Differences

The UR‑1HH belongs to the first‑generation high‑voltage power supplies. In 2014, GE released the UR‑SH second‑generation modules with several improvements:

Frequently Asked Questions

Q: What is the power rating of the UR‑1HH? A: It provides 35 W at 125–250 V DC and 35 VA at 100–240 V AC.

Q: What is the input voltage range? A: Original UR‑1HH modules accept 88–300 V DC. The newer UR‑SH modules extend this to 88–400 V DC.

Q: Can I mix UR‑1HH and UR‑SH modules in the same relay? A: Yes, but GE recommends using matching generations for consistent rail‑monitoring behavior.

Q: How do I replace the UR‑1HH? A: Remove control power, open the hinged faceplate, release the retaining clips, slide out the module, and insert a like‑for‑like replacement.

Field Installation Guidelines

• Remove all control power before handling the module.
• Use ESD protection when working inside an energized relay cabinet.
• Verify the relay’s order code to ensure correct module type (high‑voltage vs. low‑voltage).
• Inspect connectors for proper seating before re‑energizing the relay.
• Avoid mixing generations unless necessary.