543-145

The 3" High Limit Switch L145-30F is a critical safety component engineered for HVAC systems and residential furnaces. This thermal limit control acts as a vital safeguard by monitoring the internal temperature of the heat exchanger to prevent overheating and potential equipment damage. Designed to open at a fixed temperature of 145°F, the switch interrupts the heating cycle if temperatures exceed safe operating limits and automatically resets once the temperature drops by 30°F. Reliable and durable, this high-limit sensor is a common replacement part for heating systems experiencing frequent cycling or safety shut-offs, ensuring your furnace operates safely and efficiently throughout the heating season.
Type: High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 inches (probe depth)
Application: Used in forced-air furnaces, HVAC units, and heating systems to monitor air temperature and provide over-temperature protection.
Specifications: Open Temperature: 145°F; Close/Reset Differential: 30°F; Switch Logic: Normally Closed (Opens on Temperature Rise); Probe Length: 3 inches.