Carrier HN51KB024 Contactor

In the field, reliability is everything. The Carrier HN51KB024 Contactor is a professional-grade 1-pole definite purpose contactor engineered for consistent performance in residential and light commercial HVAC systems. This OEM replacement part is rated for a 25 Amp Full Load Amperage (FLA) and features a 24V induction coil, making it the standard choice for controlling condenser fan motors and compressors in Carrier, Bryant, and Payne units. Its single-pole design typically incorporates a shunt to maintain a continuous circuit for the crankcase heater while switching the primary load.

When you're troubleshooting a no-cool call, the HN51KB024 offers a direct mechanical fit to minimize installation time. The silver cadmium oxide contacts are designed to resist pitting and welding under high inrush currents, ensuring a clean break even after thousands of cycles. For a veteran tech, the compact frame and universal mounting bracket mean this part fits into tight electrical control boxes without rerouting the line voltage or low-voltage control wiring. Whether you are dealing with a burnt coil or pitting from frequent cycling, this 24V contactor provides the exact inductive load handling required to protect the compressor winding and maintain system efficiency.

• OEM Compatibility: Exact drop-in replacement for Carrier HN51KB024, HN51KC024, and P282-0311, ensuring proper terminal alignment.
• High Ampacity Rating: Durable 25 Amp FLA (30 Amp resistive) capacity handles the high Locked Rotor Amps (LRA) of modern high-efficiency compressors.
• Quiet Operation: Precision-wound 24VAC coil reduces chatter and audible hum, preventing nuisance calls from homeowners.
• Contaminant Resistance: Designed with a semi-enclosed housing to protect the mechanical linkage from dust and debris commonly found in outdoor condensing units.

What are the signs of a failing HVAC contactor? Professionals typically look for pitted contact faces, a burnt smell from the 24V coil, or continuity issues when the coil is energized. If the compressor won't start but you have 24V at the coil, it’s time to swap the contactor.

Can I use this to replace a 30 Amp contactor? No, you should always match or exceed the FLA rating of the original component. While this is a 25A contactor, check the nameplate data of the equipment to ensure it meets the specific FLA/LRA requirements.

Will this work on a 240V system? Yes, the line voltage (load) can be 240V, provided the control voltage (coil) is 24VAC. This is the standard configuration for most residential split-system air conditioners.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.