GE Multilin UR 6MH / UR-6MH Digital Input/Output Module

GE Multilin UR‑6MH Digital Input/Output Module

Configured for digital signal acquisition and control within Universal Relay (UR) systems, the GE Multilin UR‑6MH (UR‑6MH digital I/O module) provides mixed digital input/output capability for protection, interlocking, and auxiliary control functions. The module interfaces directly with the UR backplane and supports high‑power Form‑A/Form‑C style contact architectures depending on the installed card type.

Hardware Specifications

Backplane Bus Communication Velocity and I/O Density Scaling

UR‑series digital I/O modules rely on deterministic backplane timing to ensure predictable input sampling and output activation. The UR‑6MH’s high‑power design maintains stable rail loading, preventing timing drift during simultaneous multi‑card operations. I/O density scaling across UR frames allows mixed Form‑A, Form‑C, fast Form‑C, latching, and SSR cards to coexist without firmware flash incompatibility, provided modules remain in their original slot positions.

Frequently Asked Questions

Q: Can the UR‑6MH be hot‑swapped while the relay remains energized? A: No. Control power must be removed before insertion or extraction to avoid unintended output transitions and backplane state faults.

Q: Does the UR‑6MH impose any special backplane current requirements? A: As a high‑power digital I/O module, it draws more rail current than low‑power variants, but remains within UR‑series backplane limits.

Q: Are firmware updates required when replacing a UR‑6MH with another 6M‑family module? A: No firmware resides in the module. Slot position must be preserved, but configuration remains at the relay CPU.

Field Installation Guidelines

• Remove control power before handling the module.
• Open the hinged front panel fully to access module bays.
• Record the original slot position; UR modules must be replaced in the same location.
• Use inserter clips to slide the module smoothly into the bay and ensure both clips lock simultaneously.
• Maintain clean connector surfaces to ensure stable backplane seating.
• Follow ESD precautions when accessing relay internals.