White-Rodgers 3F11-140 Fan Switch

The White-Rodgers 3F11-140 Fan Switch (OEM Part 36T22-10849) is a heavy-duty bimetal disc control designed for precision blower management in residential and commercial furnaces. Built with a 1/2" snap-disc thermostat mechanism, this switch utilizes a Single Pole Single Throw (SPST) circuit that is normally open and scheduled to close on rise. It features a fixed temperature range of 133°F to 147°F with a 30°F differential, ensuring the blower activates only when the heat exchanger has reached the appropriate thermal threshold to prevent cold air drafts at startup. The auto reset function and versatile 1/4" quick-connect terminals make it a reliable HVAC blower control for fast on-site replacements. Whether you are performing a furnace fan switch replacement or upgrading a distribution system, the 3F11-140 offers the rugged durability required for high-cycle industrial applications.

• Standardized Mounting: Features a loose ring and universal mounting holes that match standard 1/2" bimetal disc footprints for easy retrofitting.
• Broad Compatibility: Rated for up to 15A at 120VAC, making it a suitable white rodgers fan switch for a wide variety of OEM air handlers and furnaces.
• Snap-Action Reliability: High-speed contact separation minimizes arcing and extends the service life of the 36T22-10849 internal components.
• Plug-and-Play Install: Equipped with standard 1/4" quick-connect terminals to streamline wiring in tight burner compartments.

• Does this switch support manual resets? No, this is an auto reset fan switch designed to cycle automatically based on the detected temperature at the bimetal disc.
• Can I use this as a high-limit safety? No. This is a "Fan" switch (Close on Rise). A limit switch (Open on Rise) is required for safety cutouts. Always confirm the switch action (F vs L) before installation.
• What causing my fan to cycle too frequently? Frequent cycling is often tied to the 30°F differential. If the temperature drop is too rapid, ensure the heat exchanger is not over-cooled or that the switch is not positioned too far from the heat source.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.