Lennox 75W43 Thermal Switch 320788-703 typically used with 1-1/4 inch

typically used with 1-1/4 inch nominal copper tubing (Type L or M)

allowing it to function at zero differential pressure

making it a standard choice for contractors requiring a high-limit or safety-interlock pressure switch

fail-in-place performance during power interruptions

Lennox 75W43 Thermal Switch 320788-703 typically used with 1-1/4 inchThe Lennox 75W43 is a high precision compressor thermal switch engineered for critical temperature regulation in industrial and residential HVACR systems. As a genuine OEM component (Manufacturer Number 103048 01), this HVAC thermal protection switch prevents catastrophic equipment failure by monitoring operational heat levels. It features a specified open temperature range of 239F to 257F, which interrupts the electrical circuit to protect the