If the relay trips immediately on startup

consolidating your inventory for multiple service calls

Professional Durability: Bimetal sensor housing is built to withstand the rigorous cycling common in heavy-duty commercial and residential HVAC applications

Auto-Reset Functionality: Automatically resets once temperatures drop 30 degrees below the 220°F trip point

Compact NEMA 1 enclosure protects internal components while saving space in cramped mechanical rooms

Reznor 203933 Pressure Switch Els PW 17895 If the relay trips immediatelyThe Reznor 203933 Pressure Switch is a critical safety component designed for precise airflow monitoring in commercial and industrial heating and ventilation systems. This genuine OEM part features a 0. 75" WC setpoint, ensuring the inducer motor or venter assembly is moving sufficient combustion air before allow the gas valve to energize. Built with a SPDT (Single Pole Double Throw) switch configuration, the 203933 provides versatile electrical