White-Rodgers 3L05-13 Limit Switch

The White-Rodgers 3L05-13 is a professional-grade adjustable snap disc limit control designed for heavy-duty HVAC heating applications. This SPST open on rise switch provides critical high-limit protection, ensuring system safety by breaking the electrical circuit when temperatures reach the user-defined set point. Engineered for versatile field replacement, it features an adjustable temperature range of 250°F to 290°F and a fixed 40°F differential, making it an ideal OEM replacement limit switch for various furnace and air handling units.

Built with a flanged airstream mount and 1/4-inch quick-connect terminals, the 74T11-310730 model allows for rapid installation in tight plenum spaces. The automatic reset functionality ensures that once the temperature drops below the differential threshold, the switch closes to resume normal operation. With a robust electrical rating of 14A at 120VAC and 10A at 240VAC, this limit control thermostat offers the reliable performance required by veteran contractors managing demanding thermal environments.

• Field Adjustability: The 250°F to 290°F range allows for precision tuning to specific equipment requirements.
• High-Speed Contact Separation: The internal snap-action bimetal disc ensures clean circuit interruption and long-term switch reliability.
• Universal Mounting: The flanged airstream design integrates seamlessly with standard ¾-inch snap disc footprints.
• Industrial Durability: Rated for up to 25A resistive loads at 120VAC, providing a high safety margin for heating circuits.
• Automatic Reset: Eliminates the need for manual intervention after a standard thermal trip event.

What is the difference between an 'L' and 'F' White-Rodgers control?
In the White-Rodgers numbering system, 'L' stands for Limit (Open on Rise), used to prevent overheating, while 'F' stands for Fan (Close on Rise), used to engage blowers once the heat exchanger is warm.

Can I use the 3L05-13 to replace a fixed-temperature limit switch?
Yes, provided the original switch fell within the 250°F to 290°F range. Check your equipment's nameplate to ensure this switch's 40°F differential is compatible with your furnace's cycling requirements.

Does the 3L05-13 require a specific mounting orientation?
This flanged airstream model is designed to be inserted into the plenum or a cutout in the heat exchanger cabinet. For accurate sensing, ensure the disc has direct exposure to the airflow.

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.