White-Rodgers 3L09-11 Limit Switch

Professional-grade White-Rodgers 3L09-11 board-mounted limit switches provide critical high-limit protection for furnace and air handling systems. As a veteran-trusted fixed temperature limit switch, this 1/2" bimetal disc control features a fixed open temperature of 210°F and a fixed close temperature of 170°F. Its Open on Rise switch action ensures immediate contact separation whenever thermal thresholds are exceeded, protecting residential and industrial equipment from overheating. This auto reset limit control is engineered with a 3.12" insertion length for accurate sensing in the airflow stream and is commonly utilized as a Therm-O-Disc 36T replacement. Designed for reliability, the 3L09-11 board mount offers a compact solution for technicians seeking rapid response times and consistent performance in demanding HVACR applications.

• Precision Thermal Control: Fixed 210°F open and 170°F close settings eliminate the risk of improper field adjustments.
• High-Speed Contact Separation: Proven bimetal disc design provides rapid switching to protect system components.
• Versatile Compatibility: Serving as an OEM replacement for various competitive models, it integrates seamlessly into existing control boards.
• Industrial Durability: Rated for resistive and inductive loads across 120V, 240V, and 277V circuits.
• Efficient Installation: The 3.12-inch sensing probe and board-mount configuration allow for quick on-site swaps.

• What is the primary function of the White-Rodgers 3L09-11? This is a high-limit safety device that breaks the electrical circuit when air temperatures hit 210°F and automatically restores it once the system cools to 170°F.
• Can this replace other 3L09 series switches? While the footprint is similar, ensure your specific application requires the L210-40 setting. Cross-referencing the TOD style (612719) is recommended for exact matching.
• Is professional installation required? To ensure safety and compliance with local electrical codes, this control should be installed by a qualified HVACR technician.

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.