OEM Carrier 2-Pole Contactor 40A 24V Coil for Model TCHC2550HECMRAY903

This is the genuine OEM replacement contactor for the Carrier TCHC2550HECMRAY903 heat pump system. The contactor is a heavy-duty electromagnetic relay that acts as the high-voltage switch between your thermostat's 24V control signal and the 208–230V power supply feeding the compressor and condenser fan. When the contactor fails, the AC simply won't come on — the thermostat calls for cooling, but nothing responds. You may also notice pitting or burning on the contact points, a humming relay that won't pull in, or a system that short-cycles unpredictably.

• Specs: 2-Pole (double-pole) | 40A Full Load Amps (FLA) | 24V AC Coil | 50/60 Hz | 208–230V Switching Voltage | Single Phase | OEM Part# HN52TC040
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part manufactured to exact contact gap, spring tension, and coil pull-in voltage specs. Generic contactors often use thinner contact silver alloy, leading to faster pitting and premature failure — especially under high-cycle heat pump loads.
• Install Difficulty: 2/5 — Always disconnect power at the disconnect box and verify voltage is zero with a multimeter before touching any wiring. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Typical replacement time is 20–30 minutes for a competent DIYer or technician.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse so your system is back up fast.

Compatibility: Designed for the Carrier TCHC2550HECMRAY903 heat pump condenser. Verify your existing contactor's pole count (2-pole), amperage (40A FLA), and coil voltage (24V) against your unit's data plate before ordering. Cross-reference: HN52TC040 is also noted as equivalent to 310020Q18181CL. Need fitment help? Our HVAC parts specialists confirm compatibility before you buy — reach out via chat or phone.