{"product_id":"carrier-hb1ajx042000aaaa-contactor-1iwxlq","title":"OEM Carrier Contactor 2-Pole 24V Coil for HB1AJX042000AAAA","description":"\u003ch1\u003eOEM Carrier Contactor 2-Pole 24V Coil for Model HB1AJX042000AAAA\u003c\/h1\u003e\u003cp\u003eThis is the factory OEM replacement contactor (part number \u003cstrong\u003eHN51KC024\u003c\/strong\u003e) for the \u003cstrong\u003eCarrier HB1AJX042000AAAA\u003c\/strong\u003e condensing unit. The contactor is a high-voltage relay controlled by your thermostat's 24V signal — when the thermostat calls for cooling, the contactor closes and sends line voltage to the compressor and condenser fan motor. A failed or pitted contactor is one of the most common reasons a central air conditioner appears completely dead, hums without starting, or intermittently fails to respond to a cooling call.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 2-pole configuration | 24V AC coil voltage | Factory-rated amperage matched to Carrier HB1AJX042000AAAA | Replaces OEM part number HN51KC024\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This OEM contactor features factory-spec contact material and coil windings, ensuring proper pull-in voltage and long contact life. Generic contactors often use lower-grade contact alloys that pit faster under compressor load cycling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 3\/5\u003c\/strong\u003e — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, 1\/4\" nut driver, needle-nose pliers, multimeter. Photograph all wiring connections before removing the old contactor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty included. Orders placed before cutoff ship the same business day from our climate-controlled warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered as a direct OEM replacement for the Carrier \u003cstrong\u003eHB1AJX042000AAAA\u003c\/strong\u003e condensing unit. Cross-reference your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase — reach out before you order if you have any questions.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909350805875,"sku":"CARRIE-HB1AJX042000AAAA-CONTACTOR-HN51KC024","price":31.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909350838643,"sku":"CARRIE-HB1AJX042000AAAA-CONTACTOR-HN51KC024-GEN","price":23.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-contactor-2pole-HN51KC024_f4596476-0073-4858-a538-e569645f55f7.jpg?v=1782904792","url":"https:\/\/nationalhvacparts.com\/products\/carrier-hb1ajx042000aaaa-contactor-1iwxlq","provider":"National HVAC Parts","version":"1.0","type":"link"}