543-043

The 3-inch High Limit Switch L180-20F is a critical safety component designed for HVAC systems and furnaces. This thermal limit control monitors the internal temperature of the heat exchanger or plenum, acting as a safeguard against overheating. When temperatures reach the 180°F threshold, the switch automatically opens the electrical circuit to shut down the heating source, preventing potential equipment damage or fire hazards. Once the system cools down by a 20°F differential, the switch resets to allow for normal operation. Engineered for reliability and durability, this high limit sensor is an essential replacement part for maintaining the safety and efficiency of residential and commercial heating equipment.
Type: HVAC High Limit Switch
Size: 3-inch insertion depth
Application: Commonly used in gas furnaces, electric furnaces, and air handlers to monitor heat exchanger temperatures and provide over-temperature protection.
Specifications: Temperature Rating: Opens at 180°F; Differential: 20°F (Closes at 160°F); Reset Type: Automatic; Configuration: Normally Closed (NC) under standard operating temperatures.