GE URRHH
GE URRHH
GE URRHH
GE URRHH
GE URRHH

GE URRHH | UR Series High-Density Digital Output Relay Module – Field Service Notes

  • Model: URRHH
  • Alt. P/N: UR-RHH
  • Product Series: GE Multilin UR Universal Relay Platform
  • Hardware Type: Slot-mounted discrete relay output expansion module
  • Key Feature: High-current rated isolated dry contacts for trip and control circuits
  • Primary Field Use: Hardwired breaker tripping, lockout logic, and auxiliary control signaling in substations
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Description

Hard-Numbers: Technical Specifications

  • Output Contact Count: 6 independent Form-A normally open relay outputs
  • Contact Rating: 8A @ 250VAC, 8A @ 30VDC resistive load
  • Coil Control Logic: 24VDC internal drive, backplane commanded
  • Operating Temperature: -40°C to +70°C continuous enclosed cabinet service
  • Isolation Rating: 2500Vrms isolation between relay field contacts and backplane
  • Power Draw: 4.1W maximum, backplane powered
  • Mechanical Endurance: 100,000 cycle rated for regular control duty
  • Hot Swap Capability: Live insertion approved with inhibit logic on insert
  • Wire Termination: Screw terminal blocks, 14–22 AWG solid/stranded wire
GE URRHH

GE URRHH

The Real-World Problem It Solves

Low-power solid-state outputs cannot handle high inrush currents from breaker coils and heavy auxiliary loads. Unisolated control circuits introduce cross-talk and backfeed voltage into relay logic.

Where you’ll typically find it:

  • Transmission and distribution breaker control cabinets for trip/close circuit wiring
  • Combined cycle power plant protection racks for equipment lockout and alarm annunciation
  • Refinery and pulp mill MV switchgear needing hard contact fail-safe interlocks

Bottom line: It provides heavy-duty isolated relay contacts to handle rugged control loads without external interposing relays.

 

Hardware Architecture & Under-the-Hood Logic

URRHH uses opto-isolated drive circuitry between the UR backplane and each relay coil bank. Every contact path carries physical separation to block transients and ground noise.

  1. Backplane digital command signals pass through isolation buffers to eliminate common-mode noise.
  2. Current-limited driver circuits actuate individual relay coils with filtered DC voltage.
  3. Dry Form-A contacts physically close to route field power for trip, alarm, or interlock tasks.
  4. Onboard suppression diodes absorb inductive kickback from coils and external loads.
  5. Simple contact status feedback is sent back to the host CPU for open/closed circuit monitoring.

 

Field Service Pitfalls: What Rookies Get Wrong

Overloading Relay Contacts with Inductive LoadsTechs run breaker trip coils and motor auxiliary circuits direct to URRHH contacts. Unsuppressed inductive kickback burns contact surfaces and creates welded points over time.

  • Field Rule: Install external surge suppression on all inductive loads; stay under 5A continuous for coil loads.

Daisy-Chaining Common Control PowerMultiple output modules share a single un-fused control power leg. A shorted field wire takes down the entire control bank and triggers widespread lockout failure.

  • Quick Fix: Use individual circuit fusing per control circuit; isolate common 120V/240V legs across module banks.

Ignoring Hot-Swap Inhibit ProceduresRookies pull URRHH live while trip logic is active. Uncommanded contact chatter causes accidental breaker operation and unplanned outages.

  • Field Rule: Inhibit all output logic in EnerVista before card removal; rack lockout tags required during maintenance.
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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