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The Woodward MRU3-11D, also cataloged as the MRU3 Voltage Protection Relay, operates as a dedicated hardware component for direct voltage monitoring, overvoltage/undervoltage protection, and phase unbalance evaluation within AC distribution...
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The Woodward MRU3-11D, also cataloged as the MRU3 Voltage Protection Relay, operates as a dedicated hardware component for direct voltage monitoring, overvoltage/undervoltage protection, and phase unbalance evaluation within AC distribution platforms.
| Parameter | Specification |
|---|---|
| Model | MRU3-11D |
| Brand | Woodward |
| Origin | USA |
| Weight | 0.4 kg |
| Dimensions | 108 mm x 70 mm x 115 mm |
| Operating Temp | -20 to +60 deg C (-4 to +140 deg F) |
| Power Consumption | 24 VDC / 85-265 VAC/DC supply input |
| Voltage Monitoring Range | 0 to 690 VAC |
| Accuracy | +/-1% of nominal voltage |
| Relay Outputs | 1 SPDT relay (NO/NC), rated at 5 A, 250 VAC |
| Digital Outputs | 2 independent outputs for alarm and trip functions |
| Analog Output | 4-20 mA for voltage level indication |
| Communication Protocols | Modbus RTU via RS485 |
| Mounting | DIN rail mount |
The Woodward MRU3-11D monitors 0 to 690 VAC system lines with +/-1% accuracy to deliver deterministic actuator loop feedback response. Upon detecting out-of-spec voltage parameters or phase asymmetry, the internal micro-controller actuates its 5 A SPDT contact and dual digital outputs to execute breaker trips and alarm sequences. Simultaneously, the integrated 4-20 mA analog output transmits real-time voltage telemetry, while Modbus RTU over RS485 enables direct integration into master control networks.
Q: What are the auxiliary power supply options for the Woodward MRU3-11D relay?
A: The module supports flexible power supply inputs, operating on either 24 VDC or 85 to 265 VAC/DC auxiliary sources.
Q: What output options are available for signal telemetry and control interlocks?
A: The relay provides one 5 A / 250 VAC SPDT relay contact, two independent digital outputs for trip/alarm signals, and one 4-20 mA analog output for continuous voltage indication.
Q: How is serial communication established with high-level control systems?
A: The module integrates an RS485 serial interface utilizing the Modbus RTU protocol for real-time data acquisition and setpoint configuration.
