OEM Carrier Contactor 24V Coil 2-Pole for Model PH11JA024000AAAA

This is the factory OEM replacement contactor (part number HN51KB024) for the Carrier PH11JA024000AAAA heat pump system. The contactor is the high-voltage relay that receives a low-voltage signal (24V AC) from the thermostat and closes to send line voltage to the compressor and condenser fan motor. When the contactor fails — due to pitted contacts, a burned coil, or a stuck plunger — the system will either fail to turn on entirely, run continuously without cycling off, or trip the breaker repeatedly.

• Specs: 2-Pole configuration | 24V AC coil voltage | Rated for high-amperage compressor load | Direct OEM factory replacement for Carrier HN51KB024
• OEM vs Generic: This OEM contactor is manufactured to exact Carrier factory specifications, ensuring proper coil pull-in voltage, contact gap, and amp rating. Generic contactors may use lower-grade contact alloys that pit faster under high-cycle loads, leading to premature failure.
• Install difficulty: 3/5 — Always shut off power at both the disconnect box and the breaker panel before beginning work. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire labels or masking tape. Photograph all wiring connections before removing the old contactor. High-voltage terminals can retain charge — verify with a multimeter before touching.
• Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered for the Carrier PH11JA024000AAAA heat pump unit. Always verify your existing contactor's coil voltage and pole configuration against your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before every order — contact us before you buy.