GE Multilin UR‑6GH Digital Control I/O Module

GE Multilin UR 6GH Digital Control I/O Module

The GE Multilin UR 6GH is a Digital Control I/O module designed for the Universal Relay (UR) protection and control platform. As part of the UR modular architecture, the 6GH expands a relay’s digital input/output capability, enabling high‑reliability interfacing with breakers, switches, interlocks, alarms, and auxiliary control devices across transmission, distribution, and industrial protection schemes.

Hardware Specifications

Functional Description

The UR‑6GH module provides both digital inputs and digital outputs, allowing UR relays to interface with external control and protection hardware. It is commonly used in UR relay families such as:

• L60 Line Phase Comparison
• T60 Transformer Protection
• C30 / C60 Centralized I/O Processors
• B30 Bus Differential
• F35 Feeder Protection

The module supports:

• Dry (passive) inputs — isolated, no external voltage required
• Wet (active) inputs — energized inputs for status monitoring
• Form‑A outputs — normally open
• Form‑C outputs — changeover
• Fast Form‑C outputs — high‑speed switching for fast trip applications

The exact mix of contact types depends on the relay’s order code, where the “6G” or “6H” segment identifies the installed digital I/O module type.

Typical Applications

The UR‑6GH is used for:

• Breaker trip and close commands
• Lockout relay activation
• Alarm annunciation
• Interlocking logic
• Auxiliary control functions
• External permissive or blocking signals
• Status monitoring of switches, pushbuttons, fans, valves, and limit switches

Its robust design ensures reliable operation in harsh electrical environments.

Integration & Placement in UR Relays

The location of the UR‑6GH module inside a relay depends on:

• The relay model (B30, C30, T60, etc.)
• The order code segment (e.g., 6G, 6H, 6A)
• The number of digital I/O modules installed

Example: In a relay order code such as:

B30‑H00‑HCL‑F8H‑H6H‑L8H‑N6A‑S8H‑U6H

The segments 6H and 6A indicate digital I/O modules installed in specific chassis slots.

Frequently Asked Questions

Q: What does the UR‑6GH module do? A: It provides digital control inputs and outputs for UR relays, enabling them to interface with external protection and control devices.

Q: What types of contacts does the UR‑6GH support? A: Depending on the order option, it may support Form‑A, Form‑C, or Fast Form‑C outputs, along with wet or dry digital inputs.

Q: Where is the UR‑6GH located inside a UR relay? A: Its slot position is determined by the relay’s order code. Each two‑digit code (e.g., 6G, 6H) identifies the module’s location.

Field Installation Guidelines

• Ensure the module is fully seated in the UR chassis to maintain reliable contact‑signal timing.
• Separate digital I/O wiring from CT/VT circuits to reduce noise coupling.
• Use shielded wiring for wet contacts and terminate shields at a single point.
• Confirm contact type requirements before installation (Form‑A vs. Form‑C vs. Fast Form‑C).
• Verify connector engagement before energizing the relay.