543-185

This 3-inch high limit switch is a critical safety component designed for furnace and HVAC applications. It functions as a thermal cutout, monitoring the internal temperature of the heating system to prevent overheating and potential equipment damage. If temperatures rise above a safe threshold, the switch automatically interrupts the electrical circuit, protecting the furnace from excessive heat caused by restricted airflow or blower failure. Once the unit cools, the switch resets to restore normal operation. This durable, high-performance control is essential for ensuring the safe and efficient performance of residential forced-air heating systems.
Type: High Limit Control Switch
Size: 3-inch probe
Dimensions: 3 in
Application: Commonly used in forced-air furnaces and HVAC heating units as a primary safety thermal limit control.
Specifications: 185°F trip temperature with a 30°F automatic reset differential.