{"product_id":"westinghouse-4117a12h27-relay-modules","title":"Westinghouse 4117A12H27 Relay Modules","description":"\u003cp\u003eConfigured for discrete circuit switching and contact multiplication in WDPF platforms, the \u003cstrong\u003eWestinghouse 4117A12H27\u003c\/strong\u003e (\u003cstrong\u003e4117A12H27\u003c\/strong\u003e Relay - 24 VDC) provides direct physical\/electrical execution. This assembly isolates control logic levels from field-side loads by converting 24 VDC coil activation signals into mechanical contact closure state changes.\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\u003e4117A12H27\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWestinghouse\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\u003e0.35 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard WDPF Relay Assembly Size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e2.4 W per coil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Coil Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Rating\u003c\/td\u003e\n\u003ctd\u003e5 A at 120 VAC \/ 28 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Platform\u003c\/td\u003e\n\u003ctd\u003eWDPF DCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoop Signal Type\u003c\/td\u003e\n\u003ctd\u003e4-20 mA HART loop protocol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit Isolation\u003c\/td\u003e\n\u003ctd\u003eChannel-to-channel isolation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDCS Architecture \u0026amp; Loop Processing\u003c\/h3\u003e\n\u003cp\u003eIntegrated within the WDPF control chassis, the relay hardware incorporates channel-to-channel isolation to decouple sensitive internal digital bus logic from external industrial load transients. Input conditioning loops support control signaling integrated alongside standard 4-20 mA HART loop protocol wiring networks. Integrated cold junction compensation (CJC) references maintain analog channel processing accuracy across the shared subrack backplane assembly.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can individual relay coils be replaced while the subrack remains energized?\u003c\/p\u003e\n\u003cp\u003eA: No, coil supply power and field contact circuits must be de-energized before pulling or replacing the relay module to prevent contact arcing and backplane electrical noise.\u003c\/p\u003e\n\u003cp\u003eQ: What protection measures exist to prevent inductive kickback when driving 24 VDC relay coils?\u003c\/p\u003e\n\u003cp\u003eA: Integral flyback suppression diodes or RC snubber circuits are built into the coil driving pathway to clamp inductive voltage spikes upon coil de-energization.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eTurn off main power and isolate all field contact voltage sources prior to installing the relay assembly.\u003c\/li\u003e\n\u003cli\u003eFollow standard ESD handling procedures by using a grounded wrist strap attached to the metal cabinet frame.\u003c\/li\u003e\n\u003cli\u003eCheck relay terminal pins and socket contacts for debris, corrosion, or physical deformation before mounting.\u003c\/li\u003e\n\u003cli\u003eAlign the relay pin base with the socket housing and press firmly until the locking retaining clips engage fully.\u003c\/li\u003e\n\u003cli\u003eTighten terminal block wiring screws to specified field torque ratings to prevent loose wire connections under vibration.\u003c\/li\u003e\n\u003cli\u003eVerify field contact wiring shields are bonded to a single cabinet earth terminal to maintain high electrical noise rejection.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Westinghouse","offers":[{"title":"Default Title","offer_id":66726581338227,"sku":"4117A12H27","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/4256A01G01_Cocoai.jpg?v=1790559874","url":"https:\/\/www.dcssupplier.com\/products\/westinghouse-4117a12h27-relay-modules","provider":"DcsSupplier Limited","version":"1.0","type":"link"}