543-160

This 3-inch high limit switch is a vital safety component designed for residential furnaces and HVAC heating systems. Functioning as a thermal cutout, this sensor monitors the temperature within the heat exchanger to prevent the unit from overheating. The L160-40F configuration is engineered to automatically trip and break the electrical circuit when the internal temperature reaches 160°F, protecting your equipment from heat-related damage and ensuring safe operation. Once the system cools down by 40°F (to 120°F), the switch automatically resets to allow normal heating cycles to resume. This replacement limit control is an essential fix for furnaces experiencing short-cycling or failing to ignite due to a faulty safety sensor.
Type: High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 inches (probe depth)
Application: Forced-air furnaces, central heating units, and residential HVAC systems requiring a safety limit control to monitor heat exchanger temperatures.
Specifications: Open Temperature: 160°F; Close Temperature: 120°F (40°F Differential); Automatic Reset; Normally Closed (NC) circuit.