Reznor 221158 Limit Switch Els PW 17895 the SMD series is designed

the SMD series is designed to monitor positive

This switch functions as a temperature-actuated control that breaks the circuit when the temperature reaches 80°C (176°F) to prevent overheating

System Protection: Reduces the electrical load spike on the building’s power supply by sequencing high-amperage heating stages

preventing terminal arcing and heat buildup

Reznor 221158 Limit Switch Els PW 17895 the SMD series is designedThe Reznor 221158 is a professional grade 145F manual reset limit switch designed for critical thermal protection in industrial and commercial HVAC systems. This genuine Reznor OEM component acts as a primary safety control, monitoring the heat exchanger and air plenum to prevent hazardous overheating conditions. Engineered with a fixed 145 degree Fahrenheit trip point, the switch interrupts the control circuit if internal temperatures exceed the safe