{"product_id":"carrier-ha1bjx018000aaaa-contactor-1iwybu","title":"OEM Carrier Contactor 24V Coil 2-Pole for HA1BJX018000AAAA","description":"\u003ch1\u003eOEM Carrier Contactor HN51KB024 for Model HA1BJX018000AAAA\u003c\/h1\u003e\u003cp\u003eThis OEM contactor (part number \u003cstrong\u003eHN51KB024\u003c\/strong\u003e) is the factory-specified high-voltage relay for the \u003cstrong\u003eCarrier HA1BJX018000AAAA\u003c\/strong\u003e air handler and connected condensing system. The contactor acts as the primary switching relay between your 24V thermostat control signal and the high-voltage compressor and condenser fan circuits. When it fails — due to pitted contacts, burned terminals, or a stuck plunger — the most common symptom is an air conditioning system that simply won't turn on despite the thermostat calling for cooling. You may also notice the unit runs continuously without shutting off, or hear a loud buzzing or chattering from the contactor itself.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e 2-pole configuration | 24V AC coil voltage | Factory-rated amperage for \u003cstrong\u003eHA1BJX018000AAAA\u003c\/strong\u003e application | OEM part number HN51KB024 | Direct drop-in replacement with matching terminal layout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e OEM contactors feature silver-alloy contact tips rated for the exact load cycles of your Carrier system. Generic contactors often use inferior contact materials that pit and weld faster under compressor inrush current, leading to premature failure and potential compressor damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall difficulty: 2\/5\u003c\/strong\u003e — Always shut off power at the disconnect and breaker before beginning. Tools needed: 1\/4\" and 5\/16\" nut drivers, flathead screwdriver, needle-nose pliers, multimeter. Photograph all wiring connections before removing the old contactor, and transfer wires one at a time to avoid miswiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our stocked warehouse.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed as a direct OEM replacement for the Carrier \u003cstrong\u003eHA1BJX018000AAAA\u003c\/strong\u003e. Verify coil voltage (24V) and pole configuration on your existing unit's data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy if you have any questions. In stock and ready to ship today.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62909367812467,"sku":"CARRIE-HA1BJX018000AAAA-CONTACTOR-HN51KB024","price":31.2,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62909367845235,"sku":"CARRIE-HA1BJX018000AAAA-CONTACTOR-HN51KB024-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-HN51KB024_8cd3eead-712b-42bb-b336-159f89db5be0.jpg?v=1782905286","url":"https:\/\/nationalhvacparts.com\/products\/carrier-ha1bjx018000aaaa-contactor-1iwybu","provider":"National HVAC Parts","version":"1.0","type":"link"}