White-Rodgers 3L01-140 Limit Switch

The White-Rodgers 3L01-140 is a high-performance snap disc limit switch engineered for precise thermal management in residential and commercial heating systems. Designed as an auto reset limit switch, this component ensures critical safety by monitoring airstream temperatures and interrupting the circuit upon reaching the 140-degree fixed cut-out. As an open on rise switch action control, it is essential for preventing heat exchanger damage and ensuring the blower assembly operates within safe parameters. This HVAC high limit sensor features a standard 3/4-inch flanged airstream mount, making it a versatile White-Rodgers 3L01-140 replacement for a wide range of furnace and cabinet heater applications. The switch resets automatically at a 100-degree fixed cut-in temperature, maintaining system continuity without manual intervention. Built with a robust 60T11-610006 thermal disc, this furnace temperature limit control is rated for 120/240V AC, providing reliable SPST switching performance that veteran technicians trust for long-term field stability and system protection.

Key Benefits for HVAC Professionals

• Reliable Safety Integration: The 140-degree fixed cut-out provides a dependable fail-safe to prevent localized overheating.
• Universal Field Replacement: Compact 3/4" flanged design serves as a drop-in furnace limit switch for many OEM brands.
• Automatic System Recovery: Features a 100-degree fixed cut-in that allows the system to resume normal operation once safety thresholds are met.
• Contractor Grade Durability: The snap disc auto reset mechanism is tested for high-cycle reliability in demanding heating environments.

Common Questions About the 3L01-140

Is the White-Rodgers 3L01-140 compatible with my furnace?
This limit control specifically replaces 3/4" flanged disc switches with an open on rise action and a 140°F trip point. Always verify your existing part's temperature stamps before installation.

What does 'Open on Rise' mean for this limit switch?
In HVAC circuits, open on rise indicates that the electrical contacts will break (opening the circuit) when the sensed temperature reaches 140°F, effectively shutting down the burners.

How do I troubleshoot a 3L01-140 that won't reset?
If the temperature has dropped below the 100-degree fixed cut-in and the circuit remains open, the internal snap disc may be fatigued or the contacts pitted, indicating the need for a full replacement.

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.