White Rodgers 3L11-220 Limit Switch

The White Rodgers 3L11-220 Limit Switch is a high-reliability safety component designed for rigorous HVAC and appliance applications. This 1/2-inch bimetal disc limit switch features a precision fixed temperature setting calibrated to open at 214°C to 226°F, providing critical over-temperature protection for heating systems. Engineered with a Single Pole Single Throw (SPST) switch action that is normally closed and opens on rise, it ensures circuit interruption when thermal thresholds are exceeded. The integrated auto-reset functionality automatically restores the circuit once the temperature drops by the 30°F differential, minimizing system downtime for the end-user. Listed under the 36T21-10859 model series, this component utilizes 1/4-inch quick-connect terminations and an aluminum disc cup for efficient thermal transfer and simplified field replacement. Pros know that maintaining exact temperature tolerances is essential for system safety; the 3L11-220 delivers consistent snap-action response and long-term durability in high-cycle environments.

• Precision Thermal Calibration: Fixed range of 214°F to 226°F ensures the unit meets specific OEM safety parameters without needing manual adjustment.
• Internal 30°F Differential: Provides a stable reset window to prevent rapid short-cycling of the heating equipment.
• Robust Construction: Features stainless steel mounting brackets and a durable aluminum disc cup for reliable contact in demanding duct or cabinet environments.
• Universal 1/2" Profile: Standard snap-disc sizing allows for seamless cross-reference and installation in a wide variety of furnace and air handler brands.
• Automatic Reset Logic: Eliminates the need for manual intervention after a temporary over-temperature event.

• What is the switch action for the 3L11-220? This is an Open on Rise switch. In normal operation below 214°F, the circuit remains closed. If the temperature hits the limit, the internal bimetal disc snaps the contacts open.
• Can I use this as a replacement for other 36T series limits? Yes, provided the temperature rating and differential match. Always verify the L220-30 stamping on your original part to ensure a direct technical match.
• Does the mounting orientation matter? No, bimetal disc thermostats like the White Rodgers 3L11-220 are unaffected by vibration and can be mounted in any orientation using the loose ring brackets.

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.