OEM Carrier Single-Pole Contactor 30 Amp 24V Coil — HN51KC024 for Model PY4GNAA24040AA

This is the factory OEM replacement contactor for the Carrier PY4GNAA24040AA condensing unit, sold under Carrier part number HN51KC024. The contactor is a high-voltage relay controlled by your thermostat's 24V signal; when the thermostat calls for cooling, the 24V coil energizes and closes the contacts, sending line voltage to the compressor and/or condenser fan motor. When a contactor fails — due to pitted or burned contacts, a shorted coil, or mechanical sticking — the result is typically a system that won't turn on at all, hums without starting, or intermittently drops out mid-cycle.

• Specs: 1-Pole (single-pole) | 30A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | 24 VAC coil voltage | 50/60 Hz | Screw terminal connections | R-410A compatible system rating
• OEM vs Generic: OEM Carrier contactors are manufactured to exact factory contact gap, spring tension, and coil resistance specs. Generic aftermarket contactors often use thinner contact material that pits faster under compressor inrush load, leading to premature re-failure — particularly critical on high-tonnage condensers like the PY4GNAA24040AA.
• Install difficulty: 2/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, non-contact voltage tester. Photograph existing wiring before removing any leads — line, load, and coil terminals must be reconnected identically.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Verified fit for Carrier model PY4GNAA24040AA. Also cross-references to Carrier/Bryant/Payne models listing HN51KC024 in the official parts diagram. Always confirm the part number on your unit's wiring diagram or parts list before ordering. Our fitment team is available to verify compatibility before you buy — contact us with your full model and serial number.