{"product_id":"12hfa51a42h-ge-hfa-multicontact-auxiliary-relay","title":"12HFA51A42H GE HFA Multicontact Auxiliary Relay","description":"\u003ch2\u003eGE 12HFA51A42H HFA Series Multicontact Auxiliary Relay\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGE 12HFA51A42H\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e12HFA51A42H\u003c\/strong\u003e Multicontact Auxiliary Relay, operates as a dedicated hardware component for multi-circuit switching and interlocking logic execution within power substation control and protection panels.\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\u003ePart Segment\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eCode \/ Suffix\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eTechnical Definition\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBasic Type\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003eProduct Generation \/ Frame Designation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Family\u003c\/td\u003e\n\u003ctd\u003eHFA\u003c\/td\u003e\n\u003ctd\u003eHigh-Speed Multicontact Auxiliary Relay Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003e51\u003c\/td\u003e\n\u003ctd\u003eHand-Reset \/ Self-Reset Operating Mechanism Variant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact \/ Coil\u003c\/td\u003e\n\u003ctd\u003eA42H\u003c\/td\u003e\n\u003ctd\u003e125 VDC Coil Specification and 12-Contact Configuration\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 (General Electric)\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\u003e1.0 kg (2.2 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e12 in x 12 in x 12 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-30 deg C to +65 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e+5 VDC at 6 A (Auxiliary logic power requirement)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoil Voltage\u003c\/td\u003e\n\u003ctd\u003e125 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 12 independent contact circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReset Mechanism\u003c\/td\u003e\n\u003ctd\u003eSelf-resetting configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication Target\u003c\/td\u003e\n\u003ctd\u003eProtection, signaling, and interlocking control logic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication \u0026amp; I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe auxiliary relay interfaces directly within hardwired relay panels and high-density control racks, enabling rapid signal multiplication across 12 independent contact paths. Contact actuation occurs instantaneously upon coil energization, delivering low latency and deterministic switching behavior across interlocking loops. Built-in contact geometry supports I\/O density scaling inside protection cabinets while maintaining firmware flash compatibility with upstream digital protective relays for continuous status monitoring and system fault execution.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What operational behavior does the self-resetting mechanism provide during control loop actuation?\u003c\/p\u003e\n\u003cp\u003eA: The self-resetting mechanism automatically returns all 12 contact circuits to their normal position once the 125 VDC coil voltage de-energizes, eliminating the need for manual physical reset flags or external electrical reset signals.\u003c\/p\u003e\n\u003cp\u003eQ: How do the 12 independent contact circuits handle complex interlocking logic?\u003c\/p\u003e\n\u003cp\u003eA: Each contact set operates electrically isolated from the others, allowing field engineers to mix control, alarm signaling, and trip isolation circuits across different DC voltage potential buses within the same physical relay module.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the relay vertically on standard panel cutout frameworks using approved mounting hardware to ensure structural stability under mechanical vibration. Run all high-voltage DC control wires through dedicated wiring troughs, maintaining strict physical separation between 125 VDC coil leads and low-voltage logic cables. Field technicians must verify coil supply polarity before applying power, ensure all terminal screws are torqued down securely to mitigate contact resistance, and confirm that panel grounding connections adhere to substation low-impedance grounding standards.\u003c\/p\u003e","brand":"GE Fanuc","offers":[{"title":"Default Title","offer_id":43876732469347,"sku":"12HFA51A42H","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/214.2_aacc79ef-442d-448f-9b41-a3e029b70ead.jpg?v=1765165140","url":"https:\/\/www.autocontrolglobal.com\/products\/12hfa51a42h-ge-hfa-multicontact-auxiliary-relay","provider":"AutoControl Global","version":"1.0","type":"link"}