designed to bridge standard motor-to-housing gaps in Trane air handlers

protecting the motor protector and internal windings

the System Sensor MHW plate-mounts directly to a standard single-gang backbox

the Trane SWT1277 is functionally identical to the C340056P15 part number

Common Installation Questions

Reznor 57953 Limit Switch designed to bridge standard motor-to-housingEnsure your commercial heating units operate within safe thermal parameters with the Reznor 57953 Limit Switch. This L170 40F limit control is a precision engineered OEM replacement part designed to monitor discharge air temperatures and prevent heat exchanger damage. In the field, reliability is paramount; this switch features a fixed 170F trip point and a 130F reset differential (40F drop), making it a critical safety component for Reznor gas fired