543-033

Ensure the safe and efficient operation of your heating system with this premium 3-inch High Limit Switch. As a critical safety component in HVAC and forced-air furnaces, this high limit control switch is designed to monitor internal temperatures and prevent overheating. When the system reaches the preset thermal threshold of 150°F, the switch automatically interrupts the electrical circuit to shut down the heating element or burner, protecting your heat exchanger from damage. This L150-40F model features a 40-degree differential, meaning it will automatically reset and restore power once the temperature cools to 110°F. If your furnace is short-cycling or failing to maintain a consistent flame, replacing a worn or faulty thermal limit sensor is essential for maintaining home safety and appliance longevity.
Type: HVAC High Limit Control Switch
Size: 3-inch insertion depth
Dimensions: 3 in
Application: Commonly used in residential forced-air furnaces, HVAC units, and heating systems as a primary safety cutout to prevent overheating.
Specifications: Temperature Trip Point: 150°F (Open); Temperature Reset Point: 110°F (Close); Differential: 40°F; Circuit Configuration: Normally Closed (NC); Mounting: 3-inch flange/probe insertion.