543-008

Ensure the safety and efficiency of your heating system with this 3-inch high limit switch. Designed as a critical safety component for residential furnaces and HVAC units, this thermal limit control prevents the heat exchanger from overheating. When temperatures exceed the safe operating threshold, the switch automatically interrupts the electrical circuit to shut down the burners, protecting your equipment from damage. Once the unit cools down by the specified temperature differential, it resets to resume normal operation. This high-quality replacement part is essential for routine furnace maintenance and HVAC repairs, helping to maintain home safety while ensuring reliable performance throughout the heating season.
Type: High Limit Control Switch
Size: 3-inch probe length
Dimensions: 3 in
Application: Commonly used in forced-air furnaces, HVAC systems, and heating equipment as a primary safety sensor to monitor heat exchanger temperatures and prevent thermal overload.
Specifications: Opening Temperature: 155°F; Closing Temperature: 125°F; Temperature Differential: 30°F; Circuit: Normally Closed (NC) opens on temperature rise.