543-140

This high-quality 3-inch high limit switch is an essential safety component for residential and commercial heating systems. Designed to prevent equipment overheating, this thermal limit control monitors internal temperatures and automatically breaks the electrical circuit when it reaches a preset safety threshold of 140°F. Once the system cools down by 30°F, the switch resets, allowing for safe continued operation. A critical replacement part for furnace maintenance and HVAC repair, this reliable sensor helps protect your heat exchanger and plenum from thermal damage. Its durable construction ensures long-lasting performance, making it a vital part for ensuring your forced-air heating system operates safely throughout the winter.
Type: High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 inches
Application: Commonly used in residential furnaces, HVAC units, and forced-air heating systems to monitor plenum temperature and prevent overheating.
Specifications: Cut-out temperature: 140°F; Differential: 30°F (resets at 110°F); Configuration: Normally closed, opens on temperature rise; Mounting style: Flange mount.