meaning it seals the valve when unpowered

Always verify wire positions before disconnecting the old unit

Industrial Durability: Robust assembly construction prevents warping and degradation under high-temperature operation

Quiet Operation: Designed to reduce the harmonic noise frequently associated with variable speed air transitions in residential ductwork

System Protection: Actively monitors flue gas temperatures to trigger safety shutdowns before overheating occurs

Midco International 842518 Thermal Switch Kit 328140-751 meaning it seals the valveThe Midco International 842518 Thermal Switch Kit is a critical safety component designed for precise temperature regulation in power burners and industrial heating applications. As a genuine Midco OEM replacement part, this thermal limit switch acts as a primary fail safe, monitoring discharge air or internal housing temperatures to prevent catastrophic overheating. Field technicians rely on the 842518 for its calibrated response times and accuracy