Lennox 75W43 Thermal Switch

The Lennox 75W43 is a Thermal Switch, which is a safety component in HVAC systems especially in furnaces and heat pumps. Some switches control the temperature of crucial components in the system, the heat exchanger or compressor say, to avoid reaching their critical operational temperature. In the case where the temperature goes high, the thermal switch interrupts the electrical circuit to stop the machine from getting worse. This model is built to provide reliability and to work with heating and cooling equipment to provide system and component protection.