543-047

This 3-inch high limit switch is a vital safety component designed for residential and commercial heating systems. Functioning as a thermal safeguard, this furnace limit control monitors internal temperatures to prevent overheating. If the heat exchanger reaches a critical temperature, the switch automatically breaks the electrical circuit to the gas valve or heating element, protecting your HVAC equipment from damage and ensuring home safety. Featuring a fixed temperature setting of 145°F with a 20°F differential, this sensor ensures reliable operation and resets once the system has cooled to a safe level. It is a common replacement part for forced-air furnaces and air handlers experiencing frequent cycling or safety lockout issues.
Type: HVAC High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 inches
Application: Used in gas furnaces, electric furnaces, and air handlers as a primary safety over-temperature cutout.
Specifications: Trip Temperature: 145°F (Normally Closed); Reset Differential: 20°F; Switch Type: L-Task limit control