OEM Carrier Single-Pole Contactor 1P 30A 24V Coil — HN51KC024 for Model PY4GNAB42090AA

This is the genuine OEM factory-authorized contactor for the Carrier PY4GNAB42090AA packaged unit. The contactor is the high-voltage switching relay that closes when the thermostat sends a 24V signal, allowing line-voltage power to reach the compressor. When it fails — due to pitted or burned contacts, a welded-shut plunger, or an open coil — the system either won't turn on at all, runs continuously without shutting off, or trips the breaker. Replacing this part with the correct OEM unit restores reliable switching and protects your compressor from premature failure.

• Specs: 1-Pole | 30A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | 24 VAC Coil | 50/60 Hz | OEM Part Number HN51KC024
• OEM vs Generic: Factory-authorized OEM contactors are manufactured to exact Carrier specifications for contact gap, coil pull-in voltage, and arc suppression. Generic contactors may use lower-grade contact alloys that pit faster and fail sooner under high-cycle summer loads.
• Install difficulty: 2/5 — Always disconnect and lockout power at the disconnect box before beginning work. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before removal and transfer wires one at a time to the new contactor to avoid miswiring. Verify 24V coil pull-in after installation with a call from the thermostat.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Verified OEM replacement for Carrier model PY4GNAB42090AA. Always confirm the part number on your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to verify fitment — contact us before you order if you have any questions.