Description

URSHA UR‑Series Hot‑Swap Power Supply Module

Technical Specifications

• Product Model: URSHA
• Brand: GE Multilin
• Warranty: One Year
• Input Voltage: 125‑250 VAC / 125‑250 VDC wide‑range universal input
• Operating Temperature: -40 °C to +70 °C
• Storage Temperature: -40 °C to +85 °C
• Response Time: 20 ms hold‑up time under full‑load condition
• Protection Class: IP20 (rack‑mount plug‑in cabinet‑only unit)
• Accuracy Class: ±0.5 % DC output regulation for 24 VDC rail
• Output Frequency: Not applicable (AC‑DC power conversion unit)
• Rated Current Range: 24 VDC output, max 1.875 A, 45 W total power rating
• Communication Interface: UR‑series rack backplane connector; front‑panel status LED indicators
• Supported Protocols: Internal UR‑rack health‑status signalling for Multilin protective relays
• Overload Capacity: Over‑voltage, over‑current, thermal shutdown, reverse‑polarity protection; 2.3 kV input‑to‑output galvanic isolation
• Dimensions: 142 mm × 100 mm × 35 mm

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Product Overview

The URSHA is a hot‑swappable plug‑in power supply module for GE Multilin UR‑series universal relay racks. It converts wide‑range AC or DC station‑supply input into regulated 24 VDC logic power to feed protective relay CPU boards, I/O modules and communication cards within the UR‑rack chassis. It supports N+1 redundant parallel deployment, enabling hot‑swap replacement of a faulty power unit without tripping protective‑relay functions or interrupting plant protection workflows.

This power unit addresses critical substation‑automation risks: single‑point power‑supply failure for protective‑relay systems, mains‑supply fluctuation, and field‑wiring‑induced transient damage to relay electronics. Front‑panel LED indicators provide instant visual status of power‑ok and fault conditions for on‑site troubleshooting. Power‑system protection engineers, substation‑retrofit technicians and utility‑site maintenance teams benefit most. It fits standard UR‑series rack slots, serves as drop‑in spare hardware for legacy Multilin protection‑relay installations, and eliminates custom external power‑supply integration for power‑utility, petrochemical and heavy‑industry substation deployments.

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Key Application Notes

• Designed exclusively for GE Multilin UR‑series relay racks; cannot operate as standalone power source
• Supports parallel redundant N+1 configuration; hot‑swap function only valid in multi‑power‑unit setups
• Accepts either AC or DC station battery‑bank supply inputs; mixed AC‑DC redundant feeding is allowed
• Integrated thermal shutdown cuts off output upon excessive internal temperature to protect downstream relay hardware
• Conformal‑coated PCB variant is available for cabinets with high‑humidity and airborne‑contaminant exposure
• Reports power‑supply health status over the UR‑rack internal bus for remote alarm monitoring via relay HMI