White-Rodgers 3L05-10 Limit Switch

The White-Rodgers 3L05-10 is a professional-grade adjustable snap disc limit control designed for precise temperature regulation in forced-air heating systems. This SPST open on rise switch features a versatile 135 to 175 degrees F adjustable temperature range with a fixed 20 degrees F differential, allowing field technicians to calibrate the safety limit to specific OEM furnace requirements. Built on the reliable 74T11-310724 (Style 74T11) platform, this auto-reset limit switch serves as a high-performance replacement for numerous fixed-temperature discs, effectively reducing the need for extensive truck stock. Its flanged airstream mount and 1/4-inch quick-connect terminals ensure a secure, standard fit for rapid installation and diagnosis.

• Adjustable Set Point: Field-adjustable from 135°F to 175°F to match a wide variety of equipment specifications.
• Universal Application: Engineered to replace various fixed 3/4-inch snap disc thermostats, streamlining inventory for service calls.
• Automatic Reset: Features a snap-acting bimetal disc that automatically resets once the temperature drops by the 20°F differential.
• Industrial Build: Rated for pilot duty (125 VA) and heavy-duty resistive loads up to 25 Amps at 120/240 VAC.

How do I adjust the temperature setting on the 3L05-10?
The set point is adjusted by turning the dial to the desired "open" temperature. Ensure the setting matches the furnace manufacturer's original safety limit specifications to prevent overheating or nuisance tripping.

What is the difference between an 'Open on Rise' and 'Close on Rise' switch?
An Open on Rise switch (like the 3L05-10) is a safety limit that breaks the electrical circuit when the temperature hits the high set point. A 'Close on Rise' switch is typically used for fan control to start a blower once the heat exchanger warms up.

Is this switch compatible with 240V systems?
Yes, this control is rated for both 120 VAC and 240 VAC applications, making it suitable for gas furnaces, unit heaters, and electric heating equipment.

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.