White-Rodgers 3L03-140 Control

The White-Rodgers 3L03-140 is a high-performance SPDT snap disc limit switch engineered for precise thermal regulation in HVAC systems, furnaces, and industrial blowers. This 3/4-inch bimetal limit control features a dual-circuit configuration, providing versatile terminal logic for both fan and high-limit applications. For Terminal 1 and 3, the switch operates with a fixed cut-in temperature of 140°F and a fixed cut-out temperature of 120°F. When utilizing Terminal 1 and 2, the setpoints shift to a 190°F cut-in and 170°F cut-out, offering essential versatility for 2-circuit application requirements. Designed for automatic reset, this 60T13 snap disc utilizes a stainless steel mounting bracket and an aluminum disc cup for rapid thermal response and durability in high-demand environments. With a rating of 120/240 VAC at 10 Amps, this component is a reliable HVAC replacement part for maintaining system safety and optimizing blower motor cycles.

• Dual-Circuit Versatility: The Single Pole Double Throw (SPDT) action supports multiple temperature profiles (140/120°F and 190/170°F) in a single 3L03-140 control.
• Contractor-Grade Durability: Features an aluminum disc cup and stainless steel mounting flange for reliable limit control in harsh airstream conditions.
• Streamlined Installation: Standard 3/4-inch flanged airstream mount with 1/4-inch quick-connect terminals ensures seamless snap disc limit switch replacement.
• Automatic Reset Logic: Eliminates manual intervention by resetting the circuit once the system cools to the designated differential, ensuring continuous HVAC safety control.

Is the 3L03-140 an open-on-rise or close-on-rise switch?
Because this is an SPDT snap disc, it provides both options. Terminal 1-2 opens on rise (limit function), while Terminal 1-3 closes on rise (fan function).

Can this replace a fixed-temperature limit from another manufacturer?
Yes, if the temperature ratings and 3/4-inch mounting profile match. This White-Rodgers 3L03-140 is a common universal replacement for many 60T13 series controls.

What orientation should I use for flanged airstream mounting?
The bimetal disc should be positioned directly in the airstream for accurate temperature regulation, typically mounted on the furnace plenum or blower housing.

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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.