OEM Carrier 2-Pole Contactor 24V Coil 30A for Model C50A303521

This OEM replacement contactor is the factory-specified part for the Carrier C50A303521 packaged unit. The contactor is the high-voltage relay that closes the 240V circuit to the compressor and condenser fan motor when the thermostat signals a call for cooling. When the contactor fails — due to pitted contacts, a stuck plunger, or a burned coil — the system either won't start at all, runs continuously without cycling off, or causes nuisance tripping at the breaker. Replaces OEM part numbers HN53CB115, HN53CD115, and HN53HF122.

• Specs: 2-pole configuration | 24V AC coil voltage | 30A contact rating | 240V load side | Factory-matched contact material and coil draw for reliable switching
• OEM vs Generic: OEM contactors use precision-stamped silver-alloy contacts rated for thousands of switching cycles. Generic contactors frequently use lower-grade contact material that pits prematurely, causing voltage drop, excessive heat, and compressor damage over time.
• Install difficulty: 3/5 — Always disconnect power at the disconnect box AND the breaker before servicing. Tools needed: flat-head and Phillips screwdrivers, 1/4" nut driver, multimeter, needle-nose pliers. Photograph all wiring connections before removing the old contactor. Verify coil voltage and pole configuration on the existing unit data plate before installing.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM EST ship same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C50A303521 commercial packaged unit. Cross-references OEM part numbers HN53CB115, HN53CD115, and HN53HF122 — all three are factory-authorized replacements for this application. Confirm pole count, coil voltage, and amperage rating on your existing contactor's label before ordering. Our parts specialists are available to verify fitment prior to purchase — just reach out before you order.