The GE Multilin UR6CH is a specialized Digital Input/Output (I/O) module designed for the Universal Relay (UR) series. It is an expansion module that enables UR relays to interface with auxiliary substation equipment by providing a high density of digital contacts. The UR6CH is primarily used to increase the number of output relays available for control, signaling, and interlocking within the modular UR chassis.
For availability or technical specifications regarding your specific UR relay configuration, please visit our UR6CH contact page.
Technical Description and Parameters
The UR6CH is a “Form-C” output module, meaning its relays provide Single-Pole Double-Throw (SPDT) contacts. This configuration is often referred to as “changeover” contacts because it allows the common point to switch between a Normally Open (NO) and a Normally Closed (NC) state.
- Module Type: Digital I/O Module
- Series: GE Multilin Universal Relay (UR)
- Relay Type: 8 Form-C (SPDT) Digital Outputs
- Output Ratings:
- Continuous: 8A
- Make and Carry: 30A (per ANSI/IEEE C37.90)
- Break: 0.2A @ 125V DC (Inductive)
- Contact Material: Silver alloy
- Isolation: 2 kV AC dielectric withstand for 1 minute
- Communication: Internal Tri-Bus communication with the CPU module
Product Datasheet Specifications
- Dimensions: Approximately 152 mm x 178 mm x 38 mm (6″ x 7″ x 1.5″)
- Weight: 1.16 kg (2.55 lbs)
- Country of Origin: USA / Canada
- Mounting: Vertical slot-in for 19-inch UR Chassis
- Operating Temperature: -40°C to +70°C
- Software Compatibility: Fully configurable via EnerVista UR Setup
Application Fields
The UR6CH is widely used in power system protection and automation:
- Substation Control: Sending status signals to SCADA systems or controlling disconnect switches.
- Interlocking: Providing physical contact closure for hard-wired permissive logic between breakers.
- Alarming: Driving external annunciators or siren circuits for critical fault alerts.
- Transfer Schemes: Facilitating automatic bus transfer logic by coordinating between multiple source breakers.
Product Instructions for Use
- Hardware Configuration: Before installing the UR6CH, ensure the UR relay is powered off. The module can be placed in any available I/O slot (typically slots F through M), but its location must match the order code of your relay.
- Field Wiring: Use the terminal block on the rear of the module. Since these are Form-C contacts, each output will have three terminals: Common (C), Normally Open (NO), and Normally Closed (NC).
- Relay Logic Mapping: In the EnerVista software, navigate to the “Hardware Configuration” tab to ensure the UR6CH is recognized. Then, use FlexLogic to assign internal protection elements (like a Trip signal) to the physical outputs on the UR6CH.
- Testing: Use the relay’s “Simulation Mode” to manually toggle the UR6CH outputs and verify the field wiring without needing to trigger a real protection fault.
Q&A: Frequently Asked Questions
Q: Can I use the UR6CH for high-speed tripping? A: While the UR6CH has robust “Make and Carry” ratings, GE also offers high-speed (solid-state) and high-break modules specifically designed for direct tripping of large circuit breaker coils. The UR6CH is typically used for general-purpose signaling and control.
Q: What happens if the internal bus fails? A: The UR6CH features a “failsafe” state. If the communication with the relay’s CPU is lost, the Form-C relays will return to their de-energized state.
Q: Is the UR6CH compatible with both Version 6 and Version 7 CPUs? A: Yes, as part of the modular platform, the UR6CH hardware is designed for interoperability across different CPU generations, provided the relay’s firmware supports the specific I/O mapping.
Related Product News
GE Vernova has recently updated the documentation for the UR family, emphasizing the modularity of components like the UR6CH. As many utilities move toward IEC 61850 “digital substations,” modules like the UR6CH remain vital for bridging the gap between digital logic and traditional copper-wired auxiliary equipment. In 2026, many operators are utilizing the UR6CH in “retro-fill” projects where existing relays are upgraded to the latest Version 7 CPU while retaining the original UR6CH I/O modules to minimize wiring costs. Recent manufacturing improvements have also focused on increasing the vibration resistance of the relay contacts, making the UR6CH even more reliable for deployment in harsh industrial environments like mining and offshore oil platforms.
