White-Rodgers 3L01-300 Limit Switch

The White-Rodgers 3L01-300 is an industrial-grade snap disc limit switch designed for critical temperature regulation in heating systems, including furnaces, blowers, and high-limit safety circuits. This SPST auto reset limit switch is engineered with an open on rise action, providing a precise 300 degree fixed cut-out to prevent overheating. Once the temperature drops to the 250 degree fixed cut-in setpoint, the switch automatically resets, ensuring the system returns to normal operation without manual intervention. Built on the Therm-O-Disc 60T11 style (Type 610026), this component features a 3/4-inch flanged airstream mount with a robust aluminum disc cup for high-speed contact separation and long-term switch life.

For contractors performing field service, the White-Rodgers 3L01-300 offers universal compatibility with standard 3/4-inch mounting footprints and includes 1/4-inch quick-connect terminations. Its high electrical rating of 10A at 120VAC and 25A resistive duty makes it a reliable HVAC replacement limit control for high-demand applications. By utilizing this high temperature limit control, technicians can maintain the safety integrity of residential and light commercial heating equipment while ensuring adherence to original equipment performance standards.

• Automatic Reset Functionality: Eliminates the need for manual restarts after the system cools to the 250°F cut-in temperature.
• Precision Safety Control: Features a fixed 300°F cut-out point to protect heat exchangers and internal components from thermal damage.
• Versatile Mounting: Includes a 3/4-inch loose ring and stainless steel mounting brackets for compatibility with various airstream configurations.
• Heavy-Duty Electrical Rating: Rated for up to 25A resistive at 120/240VAC and 125 VA pilot duty, suitable for a wide range of fan and limit circuits.
• Fast Installation: The 1/4-inch quick-connect terminals and standard footprint facilitate rapid on-job replacements.

• What is the difference between "Open on Rise" and "Close on Rise"? "Open on Rise" (L-series) means the circuit breaks when the temperature reaches the high limit, whereas "Close on Rise" (F-series) targets fan applications where the circuit completes to start a blower.
• Can this be used as a universal furnace limit switch? Yes, the 3L01-300 is often used as a universal 300 degree limit switch replacement providing the cut-out and cut-in temperatures match the manufacturer's original specifications.
• What does the "3L" prefix signify? In White-Rodgers nomenclature, "L" stands for Limit, indicating a safety switch that opens as temperature increases.

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.