GE UR6DH
GE UR6DH
GE UR6DH
GE UR6DH
GE UR6DH

GE UR6MH | Multilin UR High-Density Digital I/O Module – Field Service Notes

  • Model: UR6MH
  • Alt. P/N: UR-6MH
  • Product Series: GE Multilin UR Platform
  • Hardware Type: High-density isolated digital input/output expansion module
  • Key Feature: 32 optically isolated inputs + 16 Form-A solid-state outputs
  • Primary Field Use: Scales protective relay I/O for large substation and plant control schemes

 

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Part number: UR6MH
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Description

Hard-Numbers: Technical Specifications

  • Digital Input Count: 32 optically isolated, dry contact/voltage rated
  • Digital Output Count: 16 × Form-A solid-state (SSR) outputs
  • Input Voltage Range: 24/48/125/250 VDC software configurable
  • Output Rating: 1A @ 250VAC / 30VDC per channel
  • Isolation Rating: 2500Vrms field-to-backplane galvanic isolation
  • Operating Temperature: -40°C to +70°C continuous
  • Power Draw: 5.2W max, backplane powered
  • Input Filtering: 1ms–60s software debounce, noise rejection
  • Response Time: <5ms input-to-backplane latency
  • Form Factor: Standard UR slot, hot-swap capable
GE UR6DH

GE UR6DH

The Real-World Problem It Solves

Large substations and power plants blow past base relay I/O limits fast. External relay panels add hundreds of wires, extra terminations, and constant maintenance points.

Where you’ll typically find it:

  • Transmission substation breaker control and bay interlock racks
  • Combined-cycle plant generator trip and annunciator logic panels
  • Refinery high-voltage switchgear protective relay assemblies

Bottom line: It packs 48 points of isolated I/O into one slot to eliminate external panels and cut field wiring by 60%+.

 

Hardware Architecture & Under-the-Hood Logic

uses a dedicated 32-bit onboard processor, independent of the main relay CPU. All field circuits pass through opto-isolation to block common-mode noise and ground offsets.

  1. Field inputs go through current-limiting resistors and 2500V optical isolation.
  2. Onboard processor filters bounce, timestamps changes, and flags faults locally.
  3. Clean input data transmits across the UR backplane to the main relay.
  4. Main relay commands pass through isolated drivers to solid-state output switches.
  5. Outputs switch load current; onboard MOVs suppress voltage spikes.
GE UR6DH

GE UR6DH

Field Service Pitfalls: What Rookies Get Wrong

Overloading Solid-State OutputsNew techs treat SSRs like mechanical relays, running 1A continuous on every channel. Heat builds up, de-rates the module, and causes random dropouts.

  • Field Rule: Derate to 75% (0.75A/channel) at 60°C; avoid grouping all high-current loads on one module.

Ignoring Input Voltage GroupingMixing 24VDC and 125VDC inputs on adjacent banks creates leakage currents. False “on” states trigger with no physical contact closure.

  • Field Rule: Isolate low/high voltage groups; use separate common rails for each voltage class.

Forcing Backplane InsertionMisaligned edge connectors get bent when jamming the card. Bent pins cause intermittent communication faults and module dropouts.

  • Quick Fix: Align rails first; seat evenly until latch clicks—no brute force.

 

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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