GE URRHH
GE URRHH
GE URRHH
GE URRHH
GE URRHH

GE URSHB | UR Series High-Density 48VDC Power Supply – Field Service Notes

  • Model: URSHB
  • Alt. P/N: UR-SHB
  • Product Series: GE Multilin UR Universal Relay Platform
  • Hardware Type: Slot-in high-density chassis power supply module
  • Key Feature: 125–250V AC/DC input; higher 48VDC current than URSHA
  • Primary Field Use: Main power feed for large UR racks with 12+ I/O modules
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Part number: GE URSHB
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Description

Hard-Numbers: Technical Specifications

  • Input Voltage: 125–250V AC/DC nominal, 50/60Hz
  • Backplane Output: Regulated system logic power (higher current than URSHA)
  • Aux Output: 48VDC @ 1.5A (dry contact input loops)
  • Operating Temperature: -40°C to +70°C continuous
  • Isolation Rating: 2500Vrms input-to-backplane galvanic isolation
  • Power Draw: Max 60W (high-load chassis)
  • Hot Swap: Live insertion/removal with auto-inhibit
  • LED Indicators: Front-panel PWR (green) and FAULT (red)
  • Dimensions: 6.5” L × 6.5” W × 1.75” H
  • Weight: ~2.2 lbs (~1.0 kg)
GE URRHH

GE URRHH

The Real-World Problem It Solves

Standard power supplies (URSHA) can’t handle large UR racks with 12+ I/O cards. Undersized 48VDC outputs cause voltage drop, false input alarms, and random module resets under full load.

Where you’ll typically find it:

  • Transmission substation UR protection racks with 12–16 I/O modules
  • Combined cycle power plant switchgear with dense analog/digital I/O
  • Refinery process control cabinets with 40+ dry contact inputs

Bottom line: It’s the high-current upgrade for URSHA, supporting full-density UR chassis without voltage sag.

 

Hardware Architecture & Under-the-Hood Logic

URSHB is a heavy-duty AC/DC-to-DC converter with reinforced isolation, built for maximum I/O loading. No onboard CPU—just high-efficiency power conversion and supervision.

  1. AC/DC input passes through heavy-duty EMI filter and surge suppressor.
  2. Isolated DC-DC converters deliver higher current to the UR backplane.
  3. Dedicated high-current 48VDC output powers dense dry contact input banks.
  4. Over/under-voltage, over-current, and thermal shutdown circuits trigger FAULT LED.
  5. Backplane status bus reports power supply health and load metrics to the main CPU.

 

Field Service Pitfalls: What Rookies Get Wrong

Confusing URSHB with URSHA (Critical Mistake)Techs swap URSHA (45W, 1A 48V) and URSHB (60W, 1.5A 48V) interchangeably. URSHA overloads in high-density racks; URSHB wastes cost in small racks.

  • Field Rule: Count I/O modules first—use URSHB for ≥12 modules, URSHA for <12. Label part number on cabinet door.

Overloading the 48VDC Aux OutputRookies wire 50+ dry contacts to a single URSHB 48V rail. Exceeding 1.5A causes FAULT, voltage drop, and false input statuses.

  • Quick Fix: Split large input banks—max 35 inputs per URSHB; add second URSHB for 40+ inputs.

Ignoring Thermal Derating in Sealed CabinetsTechs install URSHB in fully sealed, unventilated cabinets at +60°C. Internal overheating triggers thermal shutdown and trip logic failure.

  • Field Rule: Derate URSHB to 80% load above +55°C; add cabinet fans or vents for high-temperature environments.
GE URRHH

GE URRHH

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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