GE Multilin UR-6RH Digital I/O Module

General Electric UR 6RH Digital I/O Module

Configured for digital input/output execution in UR Series Universal Relay frames, the General Electric UR 6RH (UR 6RH digital I/O module) provides direct physical contact processing for auxiliary control points. The module includes two Form‑A outputs (no monitoring), four Form‑C outputs, and four digital inputs, enabling deterministic interaction with alarms, lights, valves, and other substation equipment.

Hardware Specifications

Backplane Bus Communication Velocity Licenses

The UR-6RH follows GE industrial control conventions for deterministic backplane communication. Digital input states and output commands propagate through fixed‑cycle UR bus timing, ensuring predictable state transitions under load. I/O density scaling allows mixed output card types without requiring firmware flash compatibility adjustments across UR relay families. Mechanical Form‑A and Form‑C outputs maintain stable switching behavior, while the absence of monitoring circuitry simplifies channel isolation and reduces internal signal overhead.

Frequently Asked Questions

Q: Can the UR‑6RH be hot‑swapped in a UR chassis? A: No. Digital I/O modules require the relay to be de‑energized before insertion or removal to maintain backplane signal integrity.

Q: What is the maximum number of contact inputs a UR relay can support? A: Depending on module type and order code selection, UR relays can support up to 96 contact inputs at utility voltage ratings up to 250 V.

Q: Does the UR‑6RH include current or voltage monitoring on its outputs? A: No. The 6R order option provides Form‑A and Form‑C outputs without monitoring capability.

Field Installation Guidelines

• Maintain separation between digital I/O wiring and CT/PT circuits to reduce noise coupling.
• Use shielded cabling for digital inputs and terminate shields at a single point.
• Verify correct slot placement, as UR modules must match the original module type installed.
• Apply uniform pressure across the module’s connector edge to ensure proper backplane seating.
• Include arc‑suppression components when wiring mechanical outputs to inductive loads.