The GE UR8LH is a high-density digital input/output module specifically designed for the General Electric Multilin Universal Relay (UR) platform. This module expands the capabilities of UR series protection relays—such as the C60, G60, or L90—by providing additional contact inputs and outputs required for complex substation automation and industrial power system protection. The “LH” designation typically indicates a specific configuration of high-voltage inputs and form-A/C outputs optimized for high-speed tripping and status monitoring.
For availability, lead times, or a formal quotation, please visit our UR8LH contact page.
Technical Description and Parameters
The UR8LH module integrates seamlessly into the modular chassis of the Multilin UR family. It is engineered to withstand the electromagnetic interference (EMI) typical of high-voltage utility environments.
- Module Type: High-Density Digital I/O Module
- Series: GE Multilin Universal Relay (UR)
- Input Types: High-voltage DC contact inputs (typically 125V or 250V DC)
- Output Types: High-current Form-A or Form-C mechanical relay outputs
- Redundancy: Compatible with dual-CPU and redundant power supply UR chassis
- Monitoring: Integrated contact health and coil monitoring
- Processing: Fast execution logic (typically < 4ms for contact transition to logic)
Product Datasheet Specifications
- Dimensions: Standard UR Series module width (plugs into rear-facing chassis slots)
- Weight: 0.82 kg (1.81 lbs)
- Country of Origin: Canada / USA
- Mounting: Vertical slot-in for GE Multilin UR Chassis (e.g., 19-inch rack format)
- Operating Temperature: -40°C to +85°C (Extended industrial range)
Application Fields
The UR8LH module is used wherever complex interlocking or high-speed tripping is required in power systems:
- Substation Automation: Monitoring breaker auxiliary contacts and issuing trip/close commands.
- Generator Protection: Managing digital signals for cooling systems and excitation interlocks.
- Transmission Line Protection: Interfacing with tele-protection equipment and pilot-wire logic.
- Industrial Plants: Coordinating load shedding and motor control sequences in large-scale manufacturing.
Product Instructions for Use
- Chassis Preparation: Power down the Multilin UR relay before installing or removing the UR8LH module to ensure the internal communication bus is protected.
- Installation: Slide the module into the designated slot (usually slots F through M, depending on the relay model). Ensure the module is fully seated and the thumb screws are hand-tightened.
- Terminal Wiring: Use ring or spade terminals for the rear screw-terminal block. Ensure that input voltages match the specific voltage rating of your UR8LH hardware variant.
- Configuration: Use GE EnerVista UR Setup software to map the new digital inputs and outputs to the internal logic equations (FlexLogic) of the relay.
Q&A: Frequently Asked Questions
Q: Can I replace a UR8LH with a different UR digital I/O module? A: While they may physically fit, the UR chassis must be re-programmed to recognize the new module type. Additionally, the voltage thresholds and output contact ratings must be compatible with your existing field wiring.
Q: Does the UR8LH support “wetting” voltage for the inputs? A: The module’s inputs are designed to sense an external voltage. If you are using dry contacts, you must provide an external DC supply (wetting voltage) within the module’s rated range.
Q: How do I know if a specific output on the UR8LH has failed? A: The UR series features advanced self-diagnostics. You can view the hardware status via the front panel HMI or the EnerVista software; an internal failure will trigger a “Critical Alarm” on the relay.
Related Product News
GE Vernova (formerly GE Grid Solutions) continues to provide long-term support for the Multilin UR platform, which remains a benchmark for utility-grade protection. Recent firmware updates have focused on enhancing the cybersecurity of the UR series, including improved encryption for communications that pass through the UR8LH logic. As part of the 2026 Grid Modernization initiative, GE has emphasized the “Universal” nature of these modules, highlighting that the UR8LH remains backward compatible with older UR chassis, allowing utilities to upgrade their I/O density without replacing the entire protection scheme.
