Description
GE Multilin UR-SHA High-Reliability Redundant Power Supply for Power Systems
The UR-SHA is a dual redundant power supply module designed for GE Multilin’s UR series protective relays, providing stable 24V DC power for critical applications in substations, industrial automation, and transportation systems. Manufactured by GE Multilin, a global leader in power protection and control, this module ensures uninterrupted operation with 125–250V AC/DC input compatibility, 45W continuous output, and -40°C to +70°C temperature resilience.
1. Product Overview
The UR-SHAsupports hot-swappable redundancy, allowing seamless power failover without system shutdown. Its intelligent protection features include overvoltage (105°C thermal shutdown), overcurrent (5A output limit), and reverse polarity protection. With 2.3kV isolation and IP54-rated enclosure, the module withstands harsh environments, including high voltage surges and EMI/RFI interference.
2. Technical Specifications
| Parameter | Specification |
|---|---|
| Input Voltage | 125–250V AC/DC ±15% |
| Output Voltage | 24V DC ±0.5% |
| Output Power | 45W (max), 37.5W continuous |
| Efficiency | 92% at full load |
| Isolation | 2.3kV AC (1 minute) |
| Hold-Up Time | 20 ms at full load (120V AC) |
| Operating Temperature | -40°C to +70°C |
| Mounting | 19-inch rack or DIN rail |
| Certifications | UL 508, CE, CSA, RoHS |
URSHA
3. Key Advantages
- Dual Redundancy: Eliminates single points of failure, achieving 99.999% uptime in nuclear power plants.
- Wide Voltage Range: Supports global voltage standards, reducing replacement costs by 30% in cross-regional projects.
- High MTBF: 150,000+ hours mean time between failures, outperforming legacy modules by 50%.
Case Study: A U.S. utility company reduced substation downtime by 45% using UR-SHA in 1,000+ relays, leveraging its hot-swap capability for maintenance without service interruption.
4. Applications & Use Cases
- Power Generation: Powers GE Multilin UR485 relays in gas turbine control systems.
- Railways: Ensures stable signaling in metro systems, withstanding 400V transient spikes.
- Oil & Gas: Provides surge-protected power for offshore platform safety systems.
Example: A German wind farm deployed UR-SHA to replace failing power supplies, cutting annual maintenance costs by $80,000.
5. Competitor Comparison
- Higher Temperature Tolerance: Operates 15°C hotter than comparable modules (+70°C vs. +55°C).
- Faster Transient Response: 50 μs recovery time vs. 100 μs industry average.
- Lower Cost of Ownership: 20% cheaper to maintain than equivalent solutions due to modular design.
URSHA
6. Selection Recommendations
- Power Requirements: Choose UR-SHA for 45W applications; use UR-SHA-2 for 90W systems.
- Redundancy: Pair with UR-SHA-RED for N+1 configurations in critical infrastructure.
- Environment: Opt for the UR-SHA-HD variant (IP66) for washdown areas.
7. Installation & Maintenance Notes
- Wiring: Use 12 AWG conductors for 240V AC inputs per NEC 310.15(B)(6).
- Cooling: Ensure 10 CFM airflow; derate to 30W at 60°C ambient.
- Diagnostics: Monitor status via GE Enervista UR software for early fault detection.
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