OEM Carrier Contactor 24V Coil 2-Pole for Model PH3ZNA030000AA

This is the factory OEM replacement contactor (part number HN51KB024) for the Carrier PH3ZNA030000AA system. The contactor is a high-voltage relay controlled by the 24V signal from your thermostat or control board. It physically closes the circuit to power the compressor and condenser fan motor each time a cooling call is made. When the contactor fails — due to worn or pitted contact points — the system may hum without starting, fail to energize at all, or remain locked on even after the thermostat is satisfied.

• Specs: 24V AC coil | 2-pole design | Factory-matched amperage rating | Direct OEM replacement for Carrier part HN51KB024
• OEM vs Generic: This is a genuine Carrier OEM contactor, manufactured to exact factory specifications. Generic aftermarket contactors often use lower-grade contact materials that pit faster under load, leading to premature failure and potential compressor damage.
• Install difficulty: 3/5 — High-voltage component; always disconnect power at the disconnect box and verify voltage is absent with a multimeter before starting. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before removing the old contactor.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PH3ZNA030000AA. Always verify your existing contactor's coil voltage (24V) and pole configuration against your unit's data plate before ordering. Our team is available to confirm fitment — contact us before you order if you have any questions.