{"product_id":"woodward-mru3-11d-digital-protection-relays","title":"Woodward MRU3-11D Digital Protection Relays","description":"\u003cp\u003eConfigured for current and voltage protection in low- and medium-voltage power distribution systems, the \u003cstrong\u003eWoodward MRU3-11D\u003c\/strong\u003e (\u003cstrong\u003eMRU3-11D\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eMRU3-11D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWoodward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.4 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e108 mm x 70 mm x 115 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +60 deg C (-4 to +140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSystem Bus \/ Auxiliary Supply Dependent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital Protection Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Protection\u003c\/td\u003e\n\u003ctd\u003eVoltage and Current Protection Functions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocol\u003c\/td\u003e\n\u003ctd\u003eModbus RTU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eWoodward Control Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHarmonic Distortion Suppression and Vector Feedback Response\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What local or remote communication interface is used by the MRU3-11D for diagnostic data retrieval?\u003c\/p\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cp\u003eQ: How is the MRU3-11D grounded to prevent electromagnetic interference in medium-voltage switchgear environments?\u003c\/p\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the MRU3-11D unit securely into the control panel cutout or enclosure mounting frame using standard fastening hardware.\u003c\/li\u003e\n\u003cli\u003eEnsure current transformer (CT) secondary circuits are shorted prior to terminating or disconnecting CT signal wires at the relay terminal block.\u003c\/li\u003e\n\u003cli\u003eConnect a heavy-gauge copper grounding strap from the relay chassis earth terminal directly to the panel main copper ground rail.\u003c\/li\u003e\n\u003cli\u003eSeparate low-voltage Modbus RTU communication lines and signal wires from primary high-voltage AC power conductors, utilizing shielded twisted-pair cabling for serial links.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":53407914393909,"sku":"MRU3-11D","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/MRU3-11D.png?v=1787736661","url":"https:\/\/www.5gplc.com\/products\/woodward-mru3-11d-digital-protection-relays","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}