545-165

Ensure the safety and efficiency of your heating system with this premium 5-inch high limit control switch. Designed as a critical safety component for forced-air furnaces and HVAC units, this thermal limit switch prevents equipment damage and potential hazards by monitoring internal temperatures. The switch is engineered to automatically open the electrical circuit when the air temperature reaches a 165°F threshold, effectively shutting down the burner to prevent overheating. Once the temperature cools down by a 30°F differential, the switch resets to restore normal operation. This reliable replacement part is essential for maintaining proper airflow safety and protecting your furnace's heat exchanger from excessive thermal stress. It is a common fix for heating systems that are short-cycling or failing to stay lit due to a faulty safety sensor.
Type: High Limit Control Switch
Size: 5-inch insertion depth
Dimensions: 5 inches
Application: Commonly used in residential and commercial gas furnaces, electric heaters, and forced-air HVAC systems to monitor plenum temperature and provide over-temperature protection.
Specifications: Cut-out Temperature: 165°F (L165); Differential/Reset: 30°F (30F); Switch Configuration: Normally Closed (NC); Reset Type: Automatic; Mounting: 5-inch probe/insertion style.