{"product_id":"carrier-ph12na024000adaa-contactor-1iwybu","title":"OEM Carrier Contactor 1-Pole 24V 25 Amp for PH12NA024000ADAA","description":"\u003ch1\u003eOEM Carrier 1-Pole Contactor 24V 25 Amp — HN51KB024 for Model PH12NA024000ADAA\u003c\/h1\u003e\u003cp\u003eThis is the factory-specified OEM single-pole contactor for the \u003cstrong\u003eCarrier PH12NA024000ADAA\u003c\/strong\u003e packaged unit. The contactor is the high-voltage switching relay that receives a 24V signal from your thermostat and closes the circuit to energize the compressor and\/or fan motor. When the contactor fails — through burned contacts, a welded coil, or a pitted switching surface — the system will either fail to start entirely, run continuously without shutting off, or make a loud buzzing\/humming noise with no cooling output. This is one of the most common failure points in any residential or light-commercial HVAC system and is a straightforward DIY replacement.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 1-Pole | 24V 50\/60Hz Coil | 25 FLA (Full Load Amps) | OEM Part# HN51KB024 | Factory tolerance-matched contacts for reliable pull-in and drop-out\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM Carrier contactors use factory-spec contact materials and coil windings calibrated to exact pull-in voltage thresholds. Generic contactors may have looser coil tolerances, leading to chatter, premature contact pitting, and shortened service life — especially during high-demand summer operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V coil signal). Photograph all wiring connections before removing the old contactor. Transfer wires one at a time to avoid miswiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty \u0026amp; Shipping:\u003c\/strong\u003e 1-year OEM factory warranty. In stock and ships same business day from our warehouse when ordered before cutoff.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered for the \u003cstrong\u003eCarrier PH12NA024000ADAA\u003c\/strong\u003e packaged unit. Verify your unit's data plate lists part number HN51KB024 or cross-references a 1-pole, 24V, 25 FLA contactor before ordering. Not sure if this is the right part? Our fitment team will confirm compatibility before you buy — just reach out before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62641964908915,"sku":"CARRIE-PH12NA024000ADAA-CONTACTOR-HN51KB024","price":72.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62641964941683,"sku":"CARRIE-PH12NA024000ADAA-CONTACTOR-HN51KB024-GEN","price":63.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-contactor-HN51KB024.jpg?v=1775021230","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ph12na024000adaa-contactor-1iwybu","provider":"National HVAC Parts","version":"1.0","type":"link"}