General Electric UR6TH Multilin Universal Relay Digital I/O Module

Technical Overview

The GE Multilin UR6TH serves as a high-density Digital Input/Output expansion module specifically engineered for the Universal Relay (UR) series. This module enables the protective relay to interface with numerous field contacts and control circuits simultaneously. By providing additional discrete I/O points, the UR6TH allows for complex automation logic and interlocking schemes within a substation or industrial power plant. Because it belongs to the modular UR platform, users can install this module into any available expansion slot of a UR-series chassis, such as the G60, L90, or F60.

Functional Performance and Circuit Integrity

This module manages a combination of inputs and outputs designed for high-speed protection and control. The UR6TH features 16 digital inputs and 8 form-A (normally open) relay outputs, providing a versatile balance for most switchgear monitoring and control requirements. Furthermore, the digital inputs incorporate programmable debouncing and filtering to prevent false triggering from electrical noise.

To ensure maximum equipment protection, the UR6TH utilizes high-speed mechanical relays for its outputs, which are capable of making and breaking significant control currents. Since the module includes dedicated terminal blocks, it facilitates organized field wiring and simplifies the testing process. Moreover, the UR6TH supports integrated monitoring of circuit continuity, which ensures that the control path to critical breakers or isolators remains intact during operation.

Key Technical Characteristics

• Manufacturer: General Electric 
• Model Number: UR6TH
• Product Family: Multilin Universal Relay (UR) Series
• Input Configuration: 16 Digital Inputs
• Output Configuration: 8 Form-A (Normally Open) Outputs
• Input Voltage Support: Multiple ranges (e.g., 24V DC, 48V DC, 125V DC, 250V DC) depending on configuration
• Contact Rating: High-duty industrial control ratings
• Mounting: Modular slot-in design for UR-series chassis
• Isolation: High-level galvanic isolation between field signals and relay logic
• Communication: Integrates with UR internal data bus for real-time logic execution

Primary Applications

• Expanding discrete I/O capacity for complex substation automation.
• Implementing breaker failure and interlocking logic in G60 or B30 relays.
• Monitoring status contacts for disconnect switches and earth switches.
• Providing output commands for motor-operated valves and circuit breaker tripping.
• Consolidating alarm signals from peripheral equipment into a central Multilin unit.