Lennox 57W75 250°F Cutout Manual Reset Limit Switch
The Lennox 57W75 is an OEM replacement limit switch designed to protect furnaces and heating equipment from dangerous overtemperature conditions. Featuring a 250°F cutout (CO) setpoint and manual reset (M/R) operation, this limit switch provides a critical layer of safety by interrupting the control circuit when excessive heat is detected — requiring a deliberate manual reset before the system can resume normal operation.
Key Features
- OEM Lennox replacement part — SKU 57W75
- 250°F cutout (CO) temperature setpoint
- Manual reset (M/R) operation for added safety assurance
- Interrupts control circuit on overtemperature detection
- Designed for use in Lennox furnaces and compatible heating systems
- Direct OEM replacement for reliable, like-for-like performance
Why Manual Reset?
Unlike automatic reset limit switches, a manual reset design requires a technician or qualified user to physically reset the device after a trip event. This ensures the root cause of the overtemperature condition is identified and corrected before the system is returned to service — reducing the risk of repeated safety trips and potential equipment damage.
Application
The Lennox 57W75 limit switch is intended for installation in Lennox furnaces and heating units as a direct OEM replacement. Always consult the equipment service manual and verify compatibility with your specific model before installation.
