Description
1. Product Title
Woodward MRU3-11D – Digital Voltage Protection Relay
2. Product Overview
The MRU3-11D is a microprocessor-based digital protection relay developed by Woodward for voltage monitoring and protection in industrial power systems. It is designed to continuously supervise electrical parameters such as voltage level, phase balance, and fault conditions, ensuring safe and stable system operation.
The MRU3-11D provides configurable protection functions including overvoltage, undervoltage, and phase imbalance detection. When abnormal conditions are detected, the relay triggers alarm or trip outputs to prevent equipment damage. Its compact design, high measurement accuracy, and integrated communication capabilities make it suitable for modern automation and power distribution systems requiring reliable protection and fast fault response.
3. Technical Specifications
- Brand: Woodward
- Model: MRU3-11D
- Warranty: One Year
- Condition: 100% New & Original
- Product Type: Digital Voltage Protection Relay
- Voltage Monitoring Range: 0–690 V AC
- Rated Frequency: 50/60 Hz
- Accuracy: ±1% of nominal voltage
- Protection Functions:
- Overvoltage
- Undervoltage
- Phase imbalance
- Relay Output:
- 1 × SPDT (NO/NC), 5 A @ 250 V AC
- Digital Outputs: 2 independent alarm/trip outputs
- Analog Output: 4–20 mA (voltage indication)
- Communication: RS485 / Modbus RTU
- Auxiliary Power Supply: 24 V DC or 85–265 V AC/DC
- Operating Temperature: -20°C to +60°C
- Mounting: DIN rail / panel mount
- Dimensions: Approx. 108 × 70 × 115 mm
- Weight: Approx. 0.4 kg
4. Key Features & Benefits
- Comprehensive Voltage Protection:
Monitors overvoltage, undervoltage, and phase imbalance, ensuring electrical system stability and preventing equipment damage. - High Measurement Accuracy:
±1% accuracy enables precise voltage monitoring, improving protection reliability in critical applications. - Flexible Configuration:
Adjustable setpoints and timing parameters allow customization for different protection schemes and system requirements. - Integrated Communication Interface:
Supports Modbus RTU over RS485, enabling seamless integration with PLC, SCADA, and DCS systems for remote monitoring. - Compact and Robust Design:
DIN-rail mountable housing simplifies installation while maintaining durability in industrial environments.
5. Application Scenarios
- Power Generation Plants:
Protects generators and auxiliary systems by monitoring voltage stability and preventing abnormal operating conditions. - Industrial Power Distribution:
Ensures reliable voltage supervision in switchgear, MCC panels, and electrical distribution networks. - Motor & Transformer Protection:
Safeguards critical assets from voltage-related faults, reducing downtime and maintenance costs.
6. Frequently Asked Questions (FAQ)
- Q: What is the primary function of the MRU3-11D?
A: It is a digital protection relay used to monitor voltage conditions and protect electrical systems from overvoltage, undervoltage, and phase imbalance faults. - Q: Is MRU3-11D compatible with legacy systems?
A: Yes, it can be integrated into legacy systems via standard relay outputs and Modbus RTU communication, provided the system supports these interfaces.WOODWARD 8273-140-2301D Woodward PEAK200 WOODWARD 5466-1035 Woodward 9907-1200
