OEM Carrier 2-Pole Contactor 40 Amp 24V Coil — HN52TC040 for Model TCHC2550HECMRAP901

This OEM Carrier contactor (part number HN52TC040) is the factory-specified high-voltage relay for the Carrier TCHC2550HECMRAP901 system. The contactor acts as the critical electrical switch between the 24V control circuit and the high-voltage compressor and condenser fan motor circuits. When the thermostat calls for cooling, the 24V coil energizes and pulls in the contacts, closing the circuit to start the compressor and fan. A failed contactor typically presents as an AC unit that won't turn on, a buzzing or chattering condenser unit, or a compressor that runs continuously without shutting off due to welded contacts.

• Specs: 2-Pole | 40 FLA (Full Load Amps) | 24V 50/60Hz coil voltage | Definite-purpose contactor | Direct OEM replacement for HN52TC040
• OEM vs Generic: This is a genuine Carrier OEM contactor, manufactured to exact factory tolerances for coil resistance, contact material, and pull-in voltage. Generic contactors may use lower-grade silver-alloy contacts that pit and weld faster under high-cycle loads, leading to premature failure.
• Install difficulty: 2/5 — Requires disconnecting main power at the disconnect box before beginning work. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before removing terminals. The coil leads are low-voltage (24V); line-side terminals are high-voltage and must be handled with care even after power is off.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed as an exact drop-in replacement for the Carrier TCHC2550HECMRAP901. Verify your unit's data plate shows the HN52TC040 part number or matching 2-pole, 40A, 24V contactor specification before ordering. Our fitment team is available to confirm compatibility — order with confidence and get your system back up and running today.