{"product_id":"ge-12hfa51a42h-auxiliary-protection-relay","title":"GE 12HFA51A42H Auxiliary Protection Relay","description":"\u003cp\u003eConfigured for high-speed multi-contact switching in protective relaying schemes, the \u003cstrong\u003eGE 12HFA51A42H\u003c\/strong\u003e (\u003cstrong\u003e12HFA51A42H\u003c\/strong\u003e Auxiliary Protection Relay) provides direct physical\/electrical execution for tripping, interlocking, and status indication circuits.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eCode Position\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eOption Designator\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunctional Description\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Family\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003eStandard GE Drawout \/ Panel Mounted Auxiliary Relay Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Type\u003c\/td\u003e\n\u003ctd\u003eHFA\u003c\/td\u003e\n\u003ctd\u003eHigh-Speed Multi-Contact Auxiliary Relay Platform\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Variation\u003c\/td\u003e\n\u003ctd\u003e51\u003c\/td\u003e\n\u003ctd\u003eSelf-Reset Instantaneous Contact Mechanism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Configuration\u003c\/td\u003e\n\u003ctd\u003eA\u003c\/td\u003e\n\u003ctd\u003eStandard Form A \/ Form B Contact Combination Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Rating\u003c\/td\u003e\n\u003ctd\u003e42\u003c\/td\u003e\n\u003ctd\u003e125 VAC Nominal Operating Coil Voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting \/ Cover\u003c\/td\u003e\n\u003ctd\u003eH\u003c\/td\u003e\n\u003ctd\u003eSurface \/ Flush Mounting with Standard Protective Cover\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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\u003e12HFA51A42H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGE\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\u003e6.59 lbs (2.99 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard HFA Type hinged armature enclosure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eCoil burden driven (Standard HFA AC operating burden)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Type\u003c\/td\u003e\n\u003ctd\u003eHFA Multi-Contact Auxiliary Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e125 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReset Mechanism\u003c\/td\u003e\n\u003ctd\u003eSelf-reset (Instantaneous)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Structure\u003c\/td\u003e\n\u003ctd\u003eHeavy-duty multi-contact arrangement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Backplane \u0026amp; Contact Synchronization\u003c\/h3\u003e\n\u003cp\u003eThe relay utilizes a balanced hinged armature mechanism designed for ultra-fast contact pickup and simultaneous actuation across all output poles. Internal coil circuit isolation withstands high dielectric surge voltages, ensuring channel-to-channel isolation between auxiliary tripping outputs and breaker trip coils. High contact pressure minimizes bounce duration during heavy fault clearing, maintaining firmware flash compatibility and signal integrity across interconnected digital protection relays and power switchgear control buses.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the reset behavior of the 12HFA51A42H relay upon coil de-energization?\u003c\/p\u003e\n\u003cp\u003eA: The 12HFA51A42H is a self-reset relay. Upon removal of the 125 VAC control voltage, internal return springs instantly return all output contacts to their primary de-energized positions.\u003c\/p\u003e\n\u003cp\u003eQ: How does the physical construction support heavy-duty circuit breaker tripping loops?\u003c\/p\u003e\n\u003cp\u003eA: HFA relays feature silver-to-silver heavy-duty contact fingers capable of making and carrying high DC control currents required by power circuit breaker trip solenoids without contact welding.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePanel Mounting\u003c\/strong\u003e: Securely mount the relay chassis vertically on a flat panel or switchgear rack to ensure proper armature movement and return spring tension.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil Circuit Wiring\u003c\/strong\u003e: Connect 125 VAC operating power to designated coil terminals. Verify supply voltage stability to prevent coil hum or chatter under marginal voltage conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding Connection\u003c\/strong\u003e: Ensure the metallic relay case and mounting frame are bonded to the switchgear ground bus using a dedicated ground conductor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Inspection\u003c\/strong\u003e: Before energizing, manually inspect contact gap clearance and verify that no wire strands or foreign debris interfere with the hinged armature assembly.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GE FANUC","offers":[{"title":"Default Title","offer_id":52718803779896,"sku":"12HFA51A42H","price":220.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1616\/3896\/files\/12HFA51A42H1.jpg?v=1785315420","url":"https:\/\/www.automodulexpert.com\/products\/ge-12hfa51a42h-auxiliary-protection-relay","provider":"AutoModuleXpert Ltd.","version":"1.0","type":"link"}