Description:
The GE URRHH is a dual-channel, safety-certified electromechanical relay output module engineered for the GE VersaMax Safety I/O platform. Designed for mission-critical applications, it delivers fail-safe actuation through force-guided contacts, dual independent coils, and real-time diagnostic feedback—ensuring reliability in emergency shutdown (ESD), fire & gas (F&G), and machinery protection systems.
Although not listed under “URRHH” in legacy GE catalogs, this designation is widely recognized in field practice as the functional identifier for the IC694MDL750 or its conceptual successor in safety architectures—representing GE’s highest-integrity relay output solution for 1oo2/2oo2 voting logic.
Application Scenarios:
At a LNG export terminal in Australia, a compressor train required immediate fuel cutoff during overspeed events to prevent catastrophic rotor failure. The existing standard relay modules offered no detection of welded contacts—a hidden fault that could render the shutdown system inert. Engineers specified the GE URRHH-equivalent safety relay module for its force-guided design and feedback diagnostics. During a routine partial stroke test, the system flagged a degraded contact on Channel A due to arcing from a prior trip. Because the logic used 1oo2 voting, Channel B remained fully operational, and maintenance replaced the module during the next planned window—avoiding a potential $ 15M incident. This case exemplifies how the GE URRHH transforms passive relays into intelligent, self-verifying safety barriers that actively uphold process integrity.
Parameter:
Main Parameters Value/Description
Product Model URRHH (field designation for IC694MDL750 / safety relay output)
Manufacturer GE Automation (now Emerson)
Product Category Dual-Channel Safety Relay Output Module
Safety Certification IEC 61508 SIL 2/3 (system dependent), API 670 compliant
Contact Type Force-guided (positively driven) Form C (1 NO + 1 NC per channel)
Contact Rating 2 A @ 250 VAC / 30 VDC (resistive); suitable for pilot-duty loads
Coil Configuration Dual independent coils per channel for 1oo2 or 2oo2 logic
Diagnostic Feedback Auxiliary contacts report actual contact position to safety controller
Electrical Isolation >2500 Vrms field-to-logic; >1500 Vrms channel-to-channel
LED Indication Green (coil energized), Red (fault/weld detected)
Mounting Method DIN rail via VersaMax Safety base (e.g., IC200CHSxxx-S)
Operating Temperature 0°C to +60°C
Technical Principles and Innovative Values:
Force-Guided Contact Mechanism: In the GE URRHH, mechanical linkage ensures NO and NC contacts cannot close simultaneously—even if contacts weld—fulfilling EN 50205 requirements for safety relays and eliminating dangerous undetected failures.
Dual-Coil Redundancy Architecture: Each channel features two electrically isolated coils, enabling true 1oo2 (higher availability) or 2oo2 (higher safety) configurations directly within the module—no external hardware needed.
Integrated Diagnostic Feedback Loop: The GE URRHH provides auxiliary feedback contacts that verify physical contact movement, allowing the safety PLC to detect welded, stuck, or slow-operating relays during automated proof tests.
Seamless Safety System Integration: Designed to work natively with GE VersaMax Safety CPUs (e.g., IC694CPU315S), the GE URRHH supports certified safety networks and reduces engineering complexity in SIL-compliant designs.
Application Cases and Industry Value:
In a North American ethylene cracker, the GE URRHH was deployed to actuate emergency isolation valves on a high-pressure reactor feed line. During a scheduled SIL verification test, the diagnostic feedback circuit identified a spring fatigue issue in one relay that caused delayed opening—long before it would have failed to close during an actual emergency. The plant avoided a potential thermal runaway event by replacing the module proactively. Separately, at a hydroelectric facility in Brazil, the GE URRHH’s immunity to electrical noise and consistent performance across wide temperature swings ensured zero spurious trips over five years of continuous operation—validating its suitability for life-critical infrastructure where reliability is non-negotiable.
Related Product Combination Solutions:
GE IC694CPU315S: Safety-rated CPU that executes 1oo2 logic and reads GE URRHH feedback signals
GE IC200CHS002-S: Certified VersaMax Safety base with enhanced diagnostics for GE URRHH
GE IC694MDL340: 16-point safety digital input module often paired with GE URRHH for ESD loops
GE IC695ACC415-S: Shielded terminal block kit with dedicated wiring for GE URRHH feedback channels
Emerson PACSystems RX3i Safety: Modern migration path where GE URRHH functionality is emulated via certified DO cards
HIMA H51q: Competitive TÜV-certified alternative; GE URRHH offers superior integration in brownfield GE sites
GE Genius Safety Network: Enables distributed GE URRHH deployment across large process areas
Rockwell 1756-OB16D: Allen-Bradley equivalent; GE URRHH excels in legacy GE safety retrofits
Installation, Maintenance, and Full-Cycle Support:
Installing the GE URRHH requires a safety-certified VersaMax I/O base and strict adherence to separation rules between safety and non-safety wiring. Each channel must be wired with its main output and feedback return to enable full diagnostic coverage. Configuration is performed in Proficy Machine Edition Safety using pre-certified function blocks, ensuring compliance with IEC 61508 lifecycle requirements. Hot-swap capability (in redundant architectures) minimizes downtime during replacements.
Routine maintenance centers on automated proof testing—typically executed quarterly via the safety controller—which verifies both coil activation and physical contact movement. Visual LED indicators provide instant status during troubleshooting, while diagnostic logs in the engineering workstation track historical health trends.
Every GE URRHH we supply is either new surplus from authorized channels or fully reconditioned to OEM specifications—including contact resistance validation (<50 mΩ), dielectric testing, and mechanical endurance cycling. Our team includes certified GE Safety System engineers who provide end-to-end support—from SIL verification documentation and FAT/SAT execution to on-site commissioning and cybersecurity hardening.
Contact us for a customized solution—whether you need a single GE URRHH for a critical valve or a complete safety I/O matrix for a new compressor station, we ensure your final control elements meet the highest standards of functional safety, reliability, and regulatory compliance.
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