{"product_id":"mrd1g5ma-digital-protection-relay-woodward","title":"MRD1G5MA Digital Protection Relay Woodward","description":"\u003cp\u003eConfigured for current monitoring and overcurrent protection in electrical power systems, the \u003cstrong\u003eWoodward MRD1G5MA\u003c\/strong\u003e (\u003cstrong\u003eMRD1G5MA\u003c\/strong\u003e Digital Protection Relay) provides direct physical\/electrical execution.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe MRD1G5MA designation identifies the specific digital protection relay variant within the Woodward High-Tech Line \/ High-Line protective relay family:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMRD1\u003c\/strong\u003e: Base digital protection relay model engineered for directional\/non-directional overcurrent and earth fault monitoring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG\u003c\/strong\u003e: Standard hardware generation and casing layout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5\u003c\/strong\u003e: 5 A nominal current input secondary rating (selectable options cover 1 A \/ 5 A).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMA\u003c\/strong\u003e: Specific auxiliary power supply and output contact hardware configuration.\u003c\/li\u003e\n\u003c\/ul\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\u003eMRD1G5MA\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\u003e5.8 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e144 mm x 72 mm x 130 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24-270 VDC \/ 24-230 VAC Auxiliary Supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Current\u003c\/td\u003e\n\u003ctd\u003e1 A or 5 A (selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Frequency\u003c\/td\u003e\n\u003ctd\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOvercurrent Setting Range\u003c\/td\u003e\n\u003ctd\u003e0.5 to 20 x In\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEarth Fault Current Range\u003c\/td\u003e\n\u003ctd\u003e0.01 to 2 x In\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTime Delay Range\u003c\/td\u003e\n\u003ctd\u003e0.1 to 20 s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Contacts\u003c\/td\u003e\n\u003ctd\u003e4 changeover contacts (250 VAC, 8 A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity\u003c\/td\u003e\n\u003ctd\u003eUp to 95% non-condensing\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 Thermal Dissipation Profiles\u003c\/h3\u003e\n\u003cp\u003eOperating with an advanced digital signal processor (DSP), the MRD1G5MA continuously samples AC current waveforms across 50\/60 Hz power circuits. The processing architecture evaluates real-time current magnitudes against programmed trip thresholds (0.5 to 20 x In) and earth fault trip limits (0.01 to 2 x In) within a 0.1 to 20 s adjustable time delay envelope. Fast signal conditioning maintains high-speed actuator loop feedback response when driving external breaker trip coils via four 250 VAC \/ 8 A output relay contacts. Internal power supply components are designed to balance thermal heat sink dissipation profiles across wide AC\/DC auxiliary voltage ranges (24-270 VDC \/ 24-230 VAC).\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What auxiliary voltage levels are supported by the MRD1G5MA power supply?\u003c\/p\u003e\n\u003cp\u003eA: The relay accepts a wide-range universal auxiliary power supply supporting 24-270 VDC or 24-230 VAC.\u003c\/p\u003e\n\u003cp\u003eQ: What are the current ratings and trip contact limits for the output relays?\u003c\/p\u003e\n\u003cp\u003eA: The unit incorporates 4 changeover output contacts rated for a maximum switching voltage of 250 VAC at an 8 A continuous resistive load.\u003c\/p\u003e\n\u003cp\u003eQ: How is the nominal current input secondary rating configured on this relay?\u003c\/p\u003e\n\u003cp\u003eA: The current input channels accommodate standard secondary CT outputs, selectable for either 1 A or 5 A nominal current (In).\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify that auxiliary power and CT secondary wiring are de-energized before making physical connections to the rear terminal block.\u003c\/li\u003e\n\u003cli\u003eShort-circuit all secondary current transformer (CT) leads prior to disconnecting or servicing the relay input terminals to avoid dangerous high-voltage transients.\u003c\/li\u003e\n\u003cli\u003eGround the protective earth (PE) terminal directly to the panel earth bus bar using a short, low-impedance grounding conductor.\u003c\/li\u003e\n\u003cli\u003eMount the 144 mm x 72 mm x 130 mm housing into a standard panel cutout, securing mounting clamps to preserve mechanical stability and dust seal integrity.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Woodward","offers":[{"title":"Default Title","offer_id":50730111959292,"sku":"MRD1G5MA","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/MRD1G5MA2.jpg?v=1785203760","url":"https:\/\/www.electronicplc.com\/es\/products\/mrd1g5ma-digital-protection-relay-woodward","provider":"Electronic PLC","version":"1.0","type":"link"}