OEM Carrier Single-Pole Contactor 25A 24V Coil — HN51KB024 for Model PH1ZNA024000AAAA

This is the factory OEM replacement contactor for the Carrier PH1ZNA024000AAAA heat pump/condenser unit. The contactor is a high-voltage relay controlled by the 24V thermostat signal — when your thermostat calls for cooling or heating, the 24V coil energizes, closing the contacts and sending line voltage to the compressor and/or condenser fan motor. A failed contactor is one of the most common reasons a Carrier unit hums but won't start, trips the breaker, or simply doesn't respond to thermostat calls at all. Burned or pitted contacts prevent current flow, while a welded contactor causes the unit to run continuously even when the thermostat is satisfied.

• Specs: 1-Pole (single-pole) | 25A Full Load Amps (FLA) | 24V AC 50/60Hz coil voltage | Direct OEM replacement for part number HN51KB024
• OEM vs Generic: OEM contactors use factory-spec silver-alloy contact tips rated for the exact load profile of your Carrier unit. Generic aftermarket contactors often use lower-grade contacts that pit and fail faster — especially in high-cycle climates. OEM is the right call for long-term reliability.
• Install Difficulty: 2/5 — Always disconnect power at the breaker and wait for capacitors to discharge before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wire connections before removal. Label wires L1, L2, T1, T2 to ensure correct reinstallation.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse — order by 3PM local time for same-day dispatch.

Compatibility: Confirmed fit for Carrier model PH1ZNA024000AAAA. Always verify your unit's data plate matches the 1-pole, 25A, 24V coil specification before ordering. Not sure? Our HVAC parts specialists verify fitment before you buy — contact us with your model and serial number.