White-Rodgers 3L02-190 Limit Switch

The White-Rodgers 3L02-190 Limit Switch is a high-performance 3/4" snap disc limit control designed for precise thermal regulation in HVAC systems and furnace safety circuits. This industrial-grade component, also identified by manufacturer number 60T15-330537, features a manual reset mechanism and a fixed 190°F cut-out temperature. Engineered with an Open on Rise switch action and a sturdy SPST configuration, it is primarily used as a high-limit safety control or for blower regulation. The 3/4 inch flanged airstream mount allows for efficient heat transfer and accurate monitoring of cabinet temperatures. Built for reliability in demanding contractor environments, this switch is a direct replacement for many OEM thermostats, providing critical protection by breaking the circuit when temperatures exceed safe operating parameters. Its tab-to-screw terminal adapters and standard mounting holes ensure straightforward installation for technicians during on-job replacements.

• Precision Thermal Safety: Fixed 190°F (88°C) cut-out ensures equipment shuts down before reaching critical overheating levels.
• Manual Reset Security: Prevents automatic equipment cycling after a high-limit event, requiring a technician to inspect and reset the limit switch.
• Versatile Electrical Ratings: Compatible with various systems, supporting 10A at 120VAC and 5A at 240VAC (Full Load).
• Industrial Durability: The 60T15-330537 snap disc design is built to withstand high-cycling environments in residential and commercial heating units.
• Simplified Inventory: The flanged airstream mount and universal 3/4" sizing make it a versatile replacement for various furnace limit controls.

How do I check if my limit switch is tripped?
On the White-Rodgers 3L02-190, a trip results in an open circuit. Use a multimeter to check for continuity across the terminals; if the circuit is open and the furnace is cool, depress the red reset button. If continuity returns, the switch was tripped.

Can this replace an automatic reset switch?
While the 190°F rating may match, switching from an automatic to a manual reset limit switch should only be done if the system design permits. Manual resets are safety-critical components that ensure an operator investigates the cause of the overheat.

What does 'Open on Rise' mean for this part?
'Open on Rise' indicates that the electrical contacts internal to the 3L02-190 will break (open) the circuit as soon as the sensed temperature reaches the 190°F threshold, effectively cutting power to the burner or heating element.

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.