543-004

Ensure your heating system operates safely with this premium 3-inch high limit switch. Designed as a critical safety component for residential gas furnaces and forced-air HVAC systems, this thermal limit control prevents dangerous overheating by monitoring internal plenum temperatures. The switch is engineered to automatically interrupt the heating cycle when temperatures reach the 170-degree Fahrenheit threshold, protecting your heat exchanger and home from potential damage. Featuring a 30-degree differential for a reliable automatic reset once the unit cools to 140 degrees, this high limit sensor is an essential replacement part for restoring furnace safety and efficiency. Ideal for HVAC maintenance and heater repairs, this durable limit control switch provides consistent climate control performance and equipment protection.
Type: High Limit Control Switch
Size: 3-inch probe
Dimensions: 3 in
Application: Residential gas furnaces, forced-air heating systems, and HVAC units requiring thermal overload protection.
Specifications: Open Temperature: 170°F; Close Temperature: 140°F; 30°F Differential; Automatic Reset; L170-30F Calibration.