Lennox 10G19 Contactor

As a seasoned technician, you know that a failing contactor is often the silent culprit behind complex 3-phase compressor issues. The Lennox 10G19 Contactor is a heavy-duty, 3-pole definite purpose contactor engineered specifically for Lennox commercial and residential condensing units. Operating with a 24V coil, this component manages high-amperage electrical loads, rated for 40 amps and capable of handling up to 600V. Replacing a pitted or welded contactor with this genuine Lennox OEM part ensures that the silver-cadmium oxide contacts provide the low-resistance path necessary to prevent voltage drops and premature motor winding failure. This HVAC compressor contactor features a compact NCO series design with 1/4-inch quick-connect terminals for the 50/60 Hz coil, making it an exact drop-in fit for models requiring Part Number 10G1901. When you are troubleshooting a unit that won't start or a compressor that stays engaged after the thermostat satisfies, this 3P 24V coil contactor is the professional-grade solution to restore reliable switching sequences in demanding environments.

• OEM Compatibility: Specifically designed as an exact replacement for Lennox, Allied, and Armstrong units to maintain original factory performance ratings.
• Robust 3-Pole Design: Handles three-phase power distribution effectively, reducing mechanical wear on high-torque compressors and fan motors.
• Industrial-Grade Construction: Features 10 HP rating at 240V and 40A full load amperage, built to withstand the frequent cycling of commercial HVACR systems.
• Simple Installation: Standard footprint and clear terminal markings allow for a fast "wire-for-wire" swap, reducing billable time on the job site.

Can I use the Lennox 10G19 for a single-phase application?
While this is a 3-pole contactor designed for 3-phase systems, it can theoretically be used in single-phase applications by utilizing only two of the three poles. However, always match the original component's pole count and amperage to ensure compliance with the local electrical code and manufacturer specifications.

How do I tell if the 10G19 coil is bad or if it's a control board issue?
Check for 24VAC across the coil terminals when there is a call for cooling. If 24V is present but the contacts do not pull in, the coil is open or shorted. If no voltage is present, the issue lies further upstream in the thermostat or control circuit.

Does this contactor include an auxiliary contact?
Yes, many versions of the 10G19 are equipped with an auxiliary contact rated for 10 Amps at 600 VAC, allowing for additional staged control or status feedback to the system controller.

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.