Lennox 73K21 Limit Switch 319847-401 facilitating precise sequencing with external

facilitating precise sequencing with external equipment

ensuring reliable thermal dissipation in high-static environments

the 100170456 provides the exact resistance values needed for accurate microprocessor-based diagnostics

featuring an operating temperature range of -30°C to 40°C and advanced EMI/RFI interference protection to keep surrounding electronic controls safe

Lennox 73K21 Limit Switch 319847-401 facilitating precise sequencing with externalThe Lennox 73K21 Limit Switch is a critical safety component designed for precise thermal regulation within residential gas furnaces and air handlers. Engineered as a Lennox replacement part, this 145 175F AUTO limit switch monitors discharge air temperatures to prevent heat exchanger overheating. It operates on a normally closed circuit that opens if temperatures exceed the 175F threshold, effectively cutting power to the gas valve or ignition