545-140

The 5-inch High Limit Switch is a critical safety component designed for residential gas furnaces and forced-air heating systems. This thermal limit control monitors the internal temperature of the furnace plenum to prevent overheating and ensure safe operation. If the air temperature exceeds the safe limit of 140°F, the switch automatically breaks the electrical circuit to shut down the burner or heating element. Once the system cools by a 30°F differential, the switch resets to allow normal heating cycles to resume. Featuring a 5-inch probe for accurate temperature detection, this high-limit sensor is an essential replacement part for maintaining HVAC system longevity and home safety. Ideal for homeowners and technicians performing furnace repairs or preventative maintenance.
Type: High Limit Control Switch
Size: 5-inch insertion probe
Dimensions: 5 inches
Application: Used in forced-air furnaces and HVAC systems as a primary safety limit to detect and prevent overheating conditions.
Specifications: Cut-out Temperature: 140°F; Cut-in/Differential: 30°F; Probe Length: 5 inches; Configuration: Normally Closed (NC).