GE UR9EH
GE UR9EH
GE UR9EH
GE UR9EH
GE UR9EH

GE UR-9EH | UR Series Universal Relay CPU Module – Legacy/High-Density Compatible

  • Model: UR-9EH
  • Alt. P/N: UR9EH
  • Product Series: GE Multilin UR Universal Relay Platform
  • Hardware Type: Slot-in legacy main CPU module (for Rev A/B I/O chassis)
  • Key Feature: Executes protection logic + dual comms; compatible with older 8xx I/O
  • Primary Field Use: Replacement/upgrade for older UR relays (F35/T60/G60) in transmission/industrial substations
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Part number: GE UR-9EH
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Description

Hard-Numbers: Technical Specifications

  • Processor Core: 32-bit DSP + RISC controller (legacy gen, high stability)
  • Communication Ports: 2×RS485 (Modbus RTU), 1×10/100Base-T Ethernet (Modbus TCP)
  • Logic Execution: 1ms scan rate; supports 800+ logic elements (gates/timers/latches)
  • Operating Temperature: -40°C to +70°C (substation industrial grade)
  • Isolation Rating: 2500Vrms (backplane-to-field reinforced isolation)
  • Power Draw: 8.0W (backplane supplied; lower than UR-9AH)
  • Memory: 64MB RAM; 128MB flash (firmware, settings, fault records)
  • Hot-Swap: Yes (live insert/remove; auto-sync config)
  • Dimensions: 150mm × 180mm × 40mm
  • Weight: ~0.79kg (1lb 10oz)
  • Software: Configured via EnerVista UR software
GE UR9EH

GE UR9EH

The Real-World Problem It Solves

Legacy UR relays (Rev A/B I/O) face CPU obsolescence but cannot use newer UR-9AH (Rev C+ I/O required). UR-9EH is the drop-in replacement for UR-9CH/9DH, extending relay life without chassis/I/O upgrades.

Where you’ll typically find it:

  • Aging transmission substations (115kV–230kV) with F35 (feeder), T60 (transformer) relays
  • Industrial power plants (oil/gas, steel) with legacy medium-voltage switchgear
  • Renewable sites with older UR relays needing grid interconnection protection
  • Distribution hubs with coordinated overcurrent/arc-flash protection on legacy chassis

Bottom line: It’s the legacy UR system core—stable, compatible with Rev A/B I/O, hot-swap capable, for older protection applications.

 

Hardware Architecture & Under-the-Hood Logic

UR-9EH is the legacy master controller, optimized for stability with older I/O modules.

  1. Backplane interface natively supports Rev A/B 8CT/VT (UR-8LM/8LV/8NH) I/O modules.
  2. DSP processes 16-bit analog samples and runs core protection algorithms (overcurrent, differential).
  3. RISC core manages logic, HMI, and dual RS485/Ethernet communications.
  4. Fault records/event logs stored in flash; supports 512+ oscillography records.
  5. Hot-swap controller enables live insertion; auto-loads config from non-volatile memory.
  6. EnerVista UR software connects via comms ports for setup, monitoring, and firmware updates.

 

Field Service Pitfalls: What Rookies Get Wrong

Mismatching Legacy vs. New CPU + I/O ModulesTechs pair UR-9EH (legacy CPU) with Rev C+ I/O or UR-9AH with Rev A/B I/O. This causes HARDWARE MISMATCH / DSP ERROR—relay fails to boot.

  • Field Rule: UR-9EH ↔ Rev A/B I/O; UR-9AH ↔ Rev C+ I/O. Never cross-generate.

Underpowering Legacy Chassis in High-Density RacksTechs fill 12-slot legacy chassis with UR-9EH (8.0W) + 8xx I/O (6–7W each). Total power exceeds 55W; CPU resets randomly.

  • Field Rule: Budget 8W/CPU + 7W/I/O; keep total <50W; use redundant power supplies for 8+ slots.

Ignoring Firmware Compatibility for Legacy I/OTechs load latest UR firmware on UR-9EH with Rev A/B I/O. Firmware drops support for legacy I/O; analog channels go offline.

  • Quick Fix: Use EnerVista to load v7.xx firmware (last compatible with Rev A/B I/O) before commissioning.
GE UR9EH

GE UR9EH

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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