OEM Carrier Contactor HN51KB024 for Model PY3PNA030040AA

This is the factory OEM replacement contactor for the Carrier PY3PNA030040AA packaged unit. The contactor is a high-voltage relay controlled by a 24V signal from the thermostat or control board. When energized, it closes the circuit to deliver line voltage to the compressor and condenser fan motor. A failed contactor is one of the most common causes of an air conditioner that won't start — symptoms include the unit being completely unresponsive, pitted or burned contacts causing intermittent operation, or the system failing to shut off due to welded contacts.

• Specs: OEM Part Number HN51KB024 | 2-Pole design | 24V coil voltage | Factory-rated amperage and contact rating matched to Carrier PY3PNA030040AA specifications
• OEM vs Generic: This OEM contactor features factory-grade silver-alloy contacts and a precision-wound 24V coil, maintaining exact pull-in and drop-out voltage thresholds. Generic contactors may use lower-grade contact materials, leading to premature pitting, arcing, and shortened service life.
• Install Difficulty: 2/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal. Swap wires one at a time to avoid miswiring.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PY3PNA030040AA. Always verify coil voltage and pole configuration against your unit's data plate and wiring diagram before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping available on all in-stock orders.