OEM Carrier 2-Pole Contactor 40A 24V Coil — HN52TC040 for Model TCHC2550HECMRSP502

The Carrier HN52TC040 is the factory-specified OEM replacement contactor for the TCHC2550HECMRSP502 and other compatible Carrier HVAC systems. The contactor is a high-voltage relay that closes when the thermostat calls for cooling or heating, allowing 240V power to flow to the compressor and condenser fan motor. When it fails, the most common symptoms are an outdoor unit that won't start at all, a compressor that hums but won't run, or a system stuck in a continuous lockout — even when the thermostat is calling correctly and the control board shows no fault codes.

• Specs: 2-Pole | 40A Full Load Amperage (FLA) | 24V AC Coil | 50/60 Hz | Definite Purpose Contactor | Factory-matched contact gap and coil pull-in voltage
• OEM vs Generic: OEM Carrier contactors are wound to exact coil resistance specifications (typically 13–14 Ohms), ensuring reliable pull-in at low 24V signal voltages. Generic contactors often use lighter-gauge contact tips that pit and arc more quickly, shortening service life under high cycling loads.
• Install Difficulty: 2/5 — Always shut off power at both the disconnect and the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V signal and confirm coil continuity), and a phone or camera to photograph existing wiring before removal. Transfer one wire at a time to the new contactor to avoid miswiring.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: This contactor is the OEM-specified replacement for Carrier model TCHC2550HECMRSP502. Always verify the pole count, FLA rating, and coil voltage on your unit's data plate or wiring diagram before ordering. Not sure it fits? Our HVAC parts team verifies fitment before you buy — contact us before placing your order.