White-Rodgers 3L05-2 Limit Switch

For high-performance furnace safety and temperature regulation, the White-Rodgers 3L05-2 Limit Switch is a versatile adjustable snap disc control designed to replace a wide variety of fixed-temperature limits. This SPST open-on-rise switch features a 3/4-inch snap disc and handles an adjustable temperature range of 175°F to 215°F, providing critical overheat protection in gas furnaces, unit heaters, and various HVAC appliances. As a professional-grade automatic reset limit switch, it utilizes a 40°F differential to ensure reliable cycling and system safety. Engineered for airstream mounting with a flanged base, the White-Rodgers 3L05-2 incorporates standard 1/4-inch quick-connect terminals, making it a primary choice for technicians conducting field replacements. Whether you are cross-referencing a Therm-O-Disc 74T11-310711 or consolidating inventory to cover multiple temperature setpoints, this HVAC limit control delivers the heavy-duty electrical ratings (up to 25A resistive) required for demanding residential and commercial heating cycles.

• Universal Compatibility: Efficiently replaces multiple fixed-temperature discs including 3L05-5, TOD 74T11, and various OEM limits from Lennox, Trane, and York.
• Adjustable Flexibility: Field-adjustable setpoint from 175°F to 215°F allows for precise calibration based on specific equipment requirements.
• Rapid Installation: Features a flanged airstream mount and standard quick-connect terminals for immediate swap-outs during service calls.
• High Electrical Capacity: Rated for up to 14A at 120VAC and 10A at 240VAC full load, ensuring durability across varied heating platforms.
• Automatic Reset: Eliminates manual resets by automatically closing the circuit once the temperature drops below the 40°F differential.

• What does "Open on Rise" mean for this switch? As a safety limit, the switch contacts break the circuit when the temperature reaches the upper setpoint (175°F-215°F), shutting down the burner or heating element.
• Can this replace a Therm-O-Disc 74T11 series? Yes, the 3L05-2 is the direct adjustable replacement for the 74T11-310711 style and many other fixed 3/4" discs.
• Does this include the mounting hardware? This part features an integrated flange for airstream mounting; however, mounting screws are typically reused from the existing installation.

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.