MDI Mercury Displacement 235NO-24A-18 Contactor 320720-756 using the genuine Lennox 57W79

using the genuine Lennox 57W79 is recommended to maintain the specific safety tolerances and OEM furnace part specifications required for your specific model's combustion air requirements

maintaining system integrity during voltage fluctuations

replacing the assembly is a common solution

this component is rated specifically for 24Vac

terminal positioning

MDI Mercury Displacement 235NO-24A-18 Contactor 320720-756 using the genuine Lennox 57W79The MDI Mercury Displacement 235NO 24A 18 Contactor is a heavy duty, 2 pole switching solution engineered for high cycle industrial HVACR applications. This 35 amp mercury contactor features a 24V AC coil and is designed for normally open operation, providing a reliable interface for controlling resistive loads like electric heaters or high intensity lighting. Unlike standard mechanical relays, this mercury displacement relay utilizes a liquid mercury