Lennox 10F73 Contactor

The Lennox 10F73 is a professional-grade 25 Amp single-pole contactor designed for high-reliability switching in residential and commercial condensing units. This definite purpose contactor features a 24V coil (24 VAC 50/60 Hz) and is engineered to handle a full load amperage (FLA) of 25A with a 35A resistive rating. As a 1-pole contactor with shunt, it ensures constant power to the crankcase heater while managing the primary compressor circuit. Field technicians frequently utilize the 10F73 as the OEM replacement contactor for several legacy parts, including 10F7301, 100438-01, 95M55, and 100438-04. Its compact frame and standard 1/4 inch quick-connect terminals allow for streamlined installation in space-constrained electrical cabinets. For maximum performance and HVAC system reliability, this component is rated for 150 Locked Rotor Amps (LRA) at 240V, making it a critical component for restoring air conditioner compressor operation during a service call.

• Universal Compatibility: Serves as the direct Lennox replacement part for diverse models, effectively replacing 95M55, 10F7301, and 100438-01.
• Enhanced Durability: Constructed with silver cadmium oxide contacts to resist pitting, arcing, and oxidation in high-cycle environments.
• Standardized Specifications: Features a 24 volt contactor coil and 25A FLA rating, meeting standard requirements for 1.5 to 3-ton condensing units.
• Simplified Service: Equipped with a single pole single throw (SPST) configuration and integrated shunt for efficient wiring and diagnostic testing.

Is the 10F73 compatible with 120V or 240V control circuits?
No. The Lennox 10F73 is strictly a 24VAC coil contactor. Applying line voltage to the coil terminals will cause immediate failure. Always verify your transformer output before installation.

What are the symptoms of a failing 25A contactor?
Contractors often report condenser chattering, humming without engagement, or pitted contacts causing a voltage drop across the poles. If the ac contactor shows visible burn marks or fails a continuity test, it requires immediate replacement.

Can I use this to replace a 2-pole contactor?
This is an SPST 1-pole contactor with a permanent shunt. If your existing unit breaks both lines of power (DPST), you should use a 2-pole equivalent to maintain local electrical code compliance and safety standards.

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.