545-135

This 5-inch furnace high limit switch is a critical safety component for residential heating systems and forced-air gas furnaces. Designed to prevent equipment damage and ensure safe operation, this thermal control switch monitors the temperature of the heat exchanger. It acts as a fail-safe by automatically interrupting power to the heating cycle if the internal temperature exceeds safe limits. Featuring an automatic reset functionality, it restores operation once the unit has cooled to a safe level. This durable replacement part is essential for HVAC maintenance, helping to protect your furnace from overheating and potential fire hazards while maintaining consistent airflow safety.
Type: High Limit Control Switch
Size: 5-inch insertion depth
Dimensions: 5 in
Application: Used in forced-air gas furnaces and HVAC systems to monitor heat exchanger temperatures and provide overheat protection.
Specifications: Opening temperature: 135°F; Reset differential: 30°F; Automatic reset; 5-inch probe length; SPST (Single Pole Single Throw) configuration.