OEM Carrier 3-Pole Contactor 208/240V 40A (HN53CD209) for Model RSA1000M5H

This is the factory-specified OEM replacement contactor for the Carrier RSA1000M5H rooftop and commercial HVAC unit. Part number HN53CD209 is a heavy-duty, 3-pole definite-purpose contactor with a 208/240V coil, rated at 40 amps full load. The contactor acts as the main high-voltage switching relay: when the thermostat or control board sends a signal, the contactor closes its poles and delivers line voltage to the compressor and condenser fan motor. When this part fails, symptoms include the system humming but not starting, chattering or buzzing at the contactor, the unit refusing to turn on, or — in the case of welded contacts — an air conditioner that runs continuously and won't shut off.

• Specs: 3-Pole | 40A Full Load Amps | 208/240V AC Coil (50/60 Hz) | Definite Purpose Contactor | Factory OEM HN53CD series
• OEM vs Generic: This genuine Carrier OEM contactor is manufactured to exact factory tolerances for contact gap, coil pull-in voltage, and arc suppression. Generic contactors often use lighter-gauge contacts that pit and weld prematurely under compressor locked-rotor current spikes, causing repeat failures.
• Install difficulty: 3/5 — Line voltage (208/240V) is present in the disconnect box. Always shut off power at the disconnect AND the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify coil continuity at ~208–240V), and wire labels or tape for terminal identification. Photo all wiring before removing the old contactor.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Engineered as the OEM direct replacement for Carrier RSA1000M5H commercial HVAC equipment. Always cross-reference the coil voltage on your unit's wiring diagram or existing contactor label before ordering — the 208/240V coil of the HN53CD209 is not interchangeable with 24V coil variants (e.g., HN53CD024). Need fitment confirmation? Our parts team verifies compatibility before you order — reach out via chat or phone.