Product Details
Configured for current and voltage protection in low- and medium-voltage power distribution systems, the Woodward MRU3-11D (MRU3-11D Digital Protection Relay) provides direct physical/electrical execution. Housed within a 108 mm x 70 mm x 115 mm enclosure, this microprocessor-based unit evaluates voltage and current signals to execute fault detection and isolation for generators, motors, and transformers.
Hardware Specifications
| 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 | System Bus / Auxiliary Supply Dependent |
| Product Type | Digital Protection Relay |
| Primary Protection | Voltage and Current Protection Functions |
| Communication Protocol | Modbus RTU |
| System Compatibility | Woodward Control Systems |
Harmonic Distortion Suppression and Vector Feedback Response
The Woodward MRU3-11D digital protection relay incorporates real-time signal processing algorithms to ensure harmonic distortion suppression across sampled voltage and current waveforms. By filtering higher-order harmonics caused by non-linear industrial loads, the module maintains precise actuator loop feedback response times during transient conditions. This processing prevents false trip execution while delivering deterministic isolation signals to upstream circuit breakers upon detection of true phase overcurrent or voltage anomalies.
Frequently Asked Questions
Q: What local or remote communication interface is used by the MRU3-11D for diagnostic data retrieval?
A: The MRU3-11D uses integrated Modbus RTU serial communication protocols to transmit real-time measurements, diagnostic telemetry, and trip status to remote SCADA or control platforms.
Q: How is the MRU3-11D grounded to prevent electromagnetic interference in medium-voltage switchgear environments?
A: The relay frame connects directly to cabinet ground via a low-impedance ground terminal lug, routing high-frequency transient noise away from internal microprocessor circuits.
Field Installation Guidelines
- Mount the MRU3-11D unit securely into the control panel cutout or enclosure mounting frame using standard fastening hardware.
- Ensure current transformer (CT) secondary circuits are shorted prior to terminating or disconnecting CT signal wires at the relay terminal block.
- Connect a heavy-gauge copper grounding strap from the relay chassis earth terminal directly to the panel main copper ground rail.
- Separate low-voltage Modbus RTU communication lines and signal wires from primary high-voltage AC power conductors, utilizing shielded twisted-pair cabling for serial links.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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