White-Rodgers 3L11-150 Switch

The White-Rodgers 3L11-150 is a heavy-duty bimetal disc thermostat engineered for high-precision thermal protection in HVAC and commercial appliance applications. This 1/2" disc switch features a normally closed configuration and is designed to open on rise when temperatures reach the 145°F to 155°F (63°C to 68°C) window. With a 30°F (17°C) differential, the automatic reset mechanism ensures consistent circuit interruption and restoration without manual intervention. Built on the Therm-O-Disc Style 10850 and Type 36T21/36T22 architecture, this component utilizes 1/4" quick-connect terminals for secure wiring and a stainless steel loose ring mounting bracket for flexible surface attachment. Rated for 15A at 120VAC and 10A at 240VAC, it provides a reliable high limit switch solution for furnace fan controls and heating elements. The aluminum disc cup ensures rapid thermal response and high-speed contact separation to minimize arcing and extend the life of the secondary limit control in demanding environments.

• Precise Thermal Cutout: Calibrated to open between 145°F and 155°F, providing a reliable safety ceiling for forced-air systems.
• Universal 1/2" Mounting: The loose-ring stainless steel bracket allows for standard bimetal disc orientation on various heat exchangers and plenums.
• Industry Standard Connections: Features 1/4" male quick-connect terminals for standard field wiring compatibility.
• Inductive Load Handling: Rated for pilot duty at 125VA, making it suitable for controlling fan motors and contactor coils.
• Automatic Reset Logic: Automatically re-closes after a 30°F temperature drop, eliminating the need for manual resets in inaccessible locations.

Is the 3L11-150 compatible with 240V systems?
Yes, the switch is rated for 10A at 240VAC and 15A at 120VAC, making it suitable for both residential and commercial voltage applications.

What is the difference between open on rise and close on rise?
The 3L11-150 is "Open on Rise," meaning it breaks the electrical circuit when the temperature climbs to the set point (145-155°F) to prevent overheating. A "Close on Rise" switch would complete a circuit to activate a cooling fan.

Can this replace a Therm-O-Disc 36T series switch?
Yes, this model is a direct cross-reference for the 36T22 and 36T21 series with style 10850, often used in Emerson and White-Rodgers OEM assemblies.

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.