Supco L340 SPST Limit Thermostat Switch 40°F

The Supco L340 is a single-pole single-throw (SPST) limit thermostat designed to provide automatic temperature control in HVAC and refrigeration applications. This limit switch is factory set to activate at 40°F, making it ideal for preventing freeze-ups in air conditioning systems and maintaining safe operating temperatures in refrigeration equipment.

Key Features:

• SPST (single-pole single-throw) switching configuration for simple on/off control
• Factory preset at 40°F activation temperature
• Automatic reset functionality returns switch to normal operation when temperature rises
• Designed for use in air conditioning, refrigeration, and heat pump systems
• Durable construction for reliable performance in demanding HVAC environments

This limit thermostat is commonly used as a safety control to protect evaporator coils from freezing, ensuring system longevity and preventing costly damage. The automatic reset design eliminates the need for manual intervention once normal operating temperatures are restored.