543-230

This 3-inch high limit switch is a critical safety component designed for residential and commercial gas furnaces and HVAC systems. It acts as a thermal safeguard by monitoring the temperature of the heat exchanger during the heating cycle. If the system detects an overheating condition that exceeds safe operating limits, the switch automatically interrupts the electrical circuit to the burners, preventing potential damage to the appliance and ensuring home safety. Once the temperature cools down by the designated differential, the switch resets to allow for normal operation. This reliable replacement part is essential for restoring proper function to heating units experiencing cycling issues or safety shutdowns.
Type: Furnace High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 inches (insertion probe)
Application: Used in forced-air gas furnaces, central heating systems, and HVAC units to prevent overheating of the heat exchanger.
Specifications: Temperature Rating: Opens at 230°F; Differential: 40°F (Resets at 190°F); Mounting: Flange mount; Type: Normally closed, opens on temperature rise.