{"product_id":"voltage-protection-relay-woodward-mru3-11d","title":"Voltage Protection Relay Woodward MRU3-11D","description":"\u003cp\u003eThe \u003cstrong\u003eWoodward MRU3-11D\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eMRU3\u003c\/strong\u003e Voltage Protection Relay, operates as a dedicated hardware component for direct voltage monitoring, overvoltage\/undervoltage protection, and phase unbalance evaluation within AC distribution platforms.\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\u003e24 VDC \/ 85-265 VAC\/DC supply input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Monitoring Range\u003c\/td\u003e\n\u003ctd\u003e0 to 690 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e+\/-1% of nominal voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Outputs\u003c\/td\u003e\n\u003ctd\u003e1 SPDT relay (NO\/NC), rated at 5 A, 250 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital Outputs\u003c\/td\u003e\n\u003ctd\u003e2 independent outputs for alarm and trip functions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Output\u003c\/td\u003e\n\u003ctd\u003e4-20 mA for voltage level indication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus RTU via RS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eDIN rail mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eActuator Loop Feedback Response and Dynamic Protection Execution\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What are the auxiliary power supply options for the Woodward MRU3-11D relay?\u003c\/p\u003e\n\u003cp\u003eA: The module supports flexible power supply inputs, operating on either 24 VDC or 85 to 265 VAC\/DC auxiliary sources.\u003c\/p\u003e\n\u003cp\u003eQ: What output options are available for signal telemetry and control interlocks?\u003c\/p\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cp\u003eQ: How is serial communication established with high-level control systems?\u003c\/p\u003e\n\u003cp\u003eA: The module integrates an RS485 serial interface utilizing the Modbus RTU protocol for real-time data acquisition and setpoint configuration.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the 108 mm x 70 mm x 115 mm enclosure onto a standard 35 mm DIN rail in a clean cabinet environment.\u003c\/li\u003e\n\u003cli\u003eWire the 0 to 690 VAC voltage sensing inputs through dedicated isolation fuses, ensuring proper line-to-line phase pairing.\u003c\/li\u003e\n\u003cli\u003eUse shielded twisted-pair cabling for the RS485 communication line and ground the cable shield at a single earth point to eliminate ground loops.\u003c\/li\u003e\n\u003cli\u003eSeparate low-voltage analog (4-20 mA) and digital signaling wiring from high-voltage AC power and SPDT relay contact connections.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":50695667974396,"sku":"MRU3-11D","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/MRU3-11D.jpg?v=1785116692","url":"https:\/\/www.electronicplc.com\/es\/products\/voltage-protection-relay-woodward-mru3-11d","provider":"Electronic PLC","version":"1.0","type":"link"}