Williams 7735 Limit Switch 328140-751 the SPST (Single-Pole Single-Throw) contacts

the SPST (Single-Pole Single-Throw) contacts lock open and require a physical technician intervention to resume operation

This usually indicates a failure in the primary operating thermostat

making it a reliable choice for maintaining system pressure and flow balance in demanding commercial and residential HVACR environments

The Trane SWT2293 Pressure Switch is a critical OEM replacement part engineered for Trane and American Standard gas furnaces

Williams 7735 Limit Switch 328140-751 the SPST (Single-Pole Single-Throw) contactsThe Williams 7735 Limit Switch is a critical OEM replacement part designed for high temperature safety regulation in Williams Forsaire Counterflow top vent furnaces. Engineered with a 330F fixed temperature setpoint and a 5 inch insertion depth, this high limit safety control ensures the combustion chamber does not exceed safe operating parameters. When air temperature reaches the 330F threshold, the switch opens the electrical circuit to the gas