UR8RH 8-Channel Relay Output Module (Industrial-Grade SPDT Switching)

The UR8RH is a high-reliability relay output expansion module engineered for GE Multilin Universal Relay platforms. Featuring eight independent Form-C (SPDT) contacts rated at 5A per channel, this module excels in substation automation, motor control, and process safety applications where fail-safe switching and galvanic isolation are non-negotiable.

Designed for mission-critical environments, the UR8RH integrates seamlessly into existing UR-series architectures—from feeder protection relays to transformer monitoring systems—providing the discrete output capacity needed for breaker trip commands, alarm annunciation, and auxiliary device control. Its hot-swappable design minimizes downtime during maintenance, while diagnostic LEDs accelerate commissioning and troubleshooting workflows.

Whether you're expanding I/O capacity for a new substation project or retrofitting legacy protection schemes, the UR8RH delivers proven performance backed by GE's engineering heritage and our comprehensive technical support.

Core Capabilities & Technical Advantages

→ Eight Independent Form-C Relay Outputs
Each channel provides both normally-open (NO) and normally-closed (NC) contacts, enabling flexible wiring configurations for diverse control logic requirements—from simple on/off switching to complex interlocking sequences.

→ 5A Contact Rating with Wide Voltage Range
Handles demanding loads including solenoid coils, contactor coils, and pilot lamps across 24-250VDC/VAC systems. Proven reliability for both resistive and inductive loads in harsh industrial environments.

→ 2500V Galvanic Isolation
Protects sensitive microprocessor-based relay logic from high-voltage transients and ground potential differences common in medium-voltage switchgear installations. Meets IEC 61850 and IEEE C37.2 isolation requirements.

✓ Hot-Swap Capability for Zero-Downtime Maintenance
Replace or add modules without de-energizing the Universal Relay chassis. Critical for 24/7 operations where scheduled outages are costly or impractical.

✓ Extended Temperature Range (-40°C to +85°C)
Qualified for outdoor enclosures, unheated control buildings, and extreme climate installations. Consistent performance across arctic cold snaps and desert heat waves.

✓ Real-Time Diagnostic Feedback
Front-panel LEDs indicate module status and individual relay states, reducing commissioning time by 30-40% compared to modules without visual diagnostics.

Industry Applications & Use Cases

Substation Protection & Control
Deploy the UR8RH in conjunction with GE F60 feeder relays or T35 transformer protection systems to execute circuit breaker trip commands, lockout relay activation, and SCADA alarm outputs. The module's fast response time (<10ms) ensures protective actions occur within required fault-clearing windows.

Motor Control Centers & Variable Frequency Drives
Provide auxiliary contact outputs for motor starter interlocks, run/fault status indication, and emergency stop circuits. The 5A rating accommodates standard control relay coils without requiring intermediate contactors.

Process Safety Instrumented Systems (SIS)
Integrate with GE C30 controllers to implement Safety Integrity Level (SIL) rated shutdown logic. Form-C contacts enable both energize-to-trip and de-energize-to-trip architectures for compliance with IEC 61511 functional safety standards.

Renewable Energy Installations
Control battery management system contactors, inverter enable signals, and grid interconnection relays in solar farms and wind turbine substations. Isolation voltage rating protects against lightning-induced surges.

Water/Wastewater Treatment Facilities
Operate pump starters, valve actuators, and chemical dosing systems through coordinated control sequences programmed in the Universal Relay platform. Corrosion-resistant conformal coating withstands high-humidity environments.

Technical Parameters & Selection Criteria

Selection Guidelines: Choose the UR8RH when your application requires more than four relay outputs or when you need both NO and NC contacts for safety interlocking. For digital input requirements, pair with the UR8ZH input module. For applications needing >8 outputs, install multiple UR8RH modules in available chassis slots (consult UR platform slot capacity).

Advanced Integration & Customization Options

IEC 61850 GOOSE Messaging: When combined with the UR7DH communications module, relay outputs can be mapped to GOOSE signals for peer-to-peer substation automation without requiring hardwired I/O between devices.

Modbus RTU/TCP Control: Configure relay states via Modbus registers for integration with third-party SCADA systems, PLCs, or building management platforms.

Programmable Logic Sequences: Utilize the UR9HH CPU module's ladder logic editor to create custom output patterns—pulse timers, alternating sequences, or conditional switching based on analog thresholds.

Redundant Power Supply Operation: Pair with dual URSHA power modules for N+1 redundancy in critical applications where single-point failures are unacceptable.

Delivery Timeline & Service Commitments

Standard Lead Time: 3-5 business days for in-stock units (Asia-Pacific region); 7-10 business days for North America/Europe via express courier.

Custom Configuration: Factory-programmed modules with pre-loaded settings available with 10-15 business day lead time (minimum order quantities apply).

Warranty Coverage: 12-month comprehensive warranty covering manufacturing defects, component failures, and workmanship issues. Extended warranty plans available for critical infrastructure projects.

Technical Support: Lifetime access to our engineering team for configuration assistance, troubleshooting guidance, and application consulting. Response time: <4 hours for urgent issues.

Documentation Package: Each module ships with installation manual, wiring diagrams, terminal block layouts, and IEC 61850 SCL files for system integration.

Frequently Asked Questions

Which Universal Relay models support the UR8RH module?
The UR8RH is compatible with all GE Multilin UR-series platforms including B30 bus differential, C60 breaker management, F60 feeder protection, G60 generator protection, L90 line differential, M60 motor protection, N60 network stability, and T60 transformer protection relays. Verify available module slots in your specific chassis configuration.

Can I hot-swap the UR8RH without losing relay programming?
Yes. Relay output assignments and logic configurations are stored in the UR CPU module's non-volatile memory. Removing or replacing the UR8RH does not affect programmed settings—outputs will resume configured states once the module is reinserted and recognized by the system.

What is the maximum wire gauge for terminal connections?
Terminal blocks accept 12-22 AWG (0.5-2.5 mm²) copper conductors. Use ferrules for stranded wire to prevent strand breakage. Recommended torque: 0.5-0.6 N·m (4.4-5.3 lb·in).

Does the module support pulse-width modulation (PWM) outputs?
No. The UR8RH uses electromechanical relays optimized for discrete on/off switching. For PWM or high-frequency switching applications (>10 Hz), consider solid-state output modules or external SSR interfaces.

How do I monitor relay contact wear over time?
The Universal Relay platform tracks cumulative relay operations via internal counters accessible through the front-panel HMI or EnerVista UR Setup software. Set maintenance alarms at 80% of rated electrical life (80,000 operations at full load) to schedule preventive replacement.

Is the UR8RH suitable for outdoor enclosure installations?
Yes, when installed in NEMA 4X or IP65-rated enclosures with adequate ventilation. The module's -40°C to +85°C operating range and conformal coating provide protection against condensation, dust, and corrosive atmospheres typical of outdoor substations.

Start Your System Expansion Today

Ready to enhance your Universal Relay platform with proven relay output technology? Our team will verify compatibility with your existing UR configuration, provide detailed wiring schematics, and coordinate delivery to meet your project timeline.

Request a technical datasheet, discuss bulk pricing for multi-site deployments, or schedule a consultation with our GE Multilin specialists.

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