000-173

This high-performance auto-reset limit switch is an essential safety component for HVAC heating systems and furnaces. Designed to monitor internal temperatures, this fan disc control switch prevents overheating by automatically interrupting the electrical circuit if the system reaches a critical thermal threshold. The L220-40F rating indicates the switch is calibrated to open at 220 degrees Fahrenheit and automatically reset once the temperature drops by 40 degrees. Replacing a faulty high-limit sensor is crucial for restoring proper furnace cycles and protecting the heat exchanger and blower motor from thermal damage. This durable, professional-grade switch is a common solution for heating units that are short-cycling or failing to stay ignited due to safety triggers.
Type: Fan Disc High Limit Control Switch
Size: Standard
Application: Used in residential and commercial furnaces, air handlers, and heating systems as a safety limit control to prevent overheating.
Specifications: Cut-out Temperature: 220°F; Differential/Reset: 40°F; Reset Type: Automatic; Circuit: Normally Closed (NC); Mounting Type: Surface Mount / Flush Mount Disc