White-Rodgers 3L03-190 Limit Switch

When you're out in the field and need a reliable SPDT snap disc limit switch, the White-Rodgers 3L03-190 is the industrial standard for HVAC temperature regulation and safety. This 3/4" bimetal disc control is engineered for precision, featuring fixed temperature settings that provide high-speed contact separation for critical systems. Operating as a Single Pole Double Throw (SPDT) switch, it enables versatile circuit logic—common for fan speed changeover or triggering an auxiliary alarm during a high-heat event. On terminals 1 and 3, you get a 190°F fixed cut-in and a 170°F fixed cut-out. For secondary logic on terminals 1 and 2, the unit is set for a 140°F cut-in and a 120°F cut-out. This multi-stage response makes the White-Rodgers 3L03-190 limit control a staple for contractors managing blowers and high-limit safety controls on 120/240VAC circuits. The flanged airstream mount and durable 60T13 (611014) construction ensure a secure fit and professional-grade performance in demanding environments.

• Universal Compatibility: Direct replacement for Therm-O-Disc 60T13 style 611014, making it easy to swap out failed limits in the field.
• High Electrical Capacity: Rated for 10A at 120VAC and 5A at 240VAC, handling inductive motor loads or resistive heating elements with ease.
• Durable Snap Action: The bimetal disc design provides immediate contact break to prevent electrical arcing and extend component life.
• Dual Circuit Logic: The SPDT configuration allows for simultaneous control of a main load and a status indicator or secondary fan.

What is the difference between terminals 1 & 3 and 1 & 2 on the 3L03-190?
Terminal 1 is common. Terminals 1 and 3 are typically used for high-limit safety (opening on rise), while terminals 1 and 2 operate as the auxiliary circuit (closing on rise), often used for fan control or status lights.

Can I use this 3/4" snap disc as a universal replacement for other brands?
Yes, as long as the temperature profile (190°F / 140°F) and SPDT switch action match your existing technical specifications, the flanged mounting adapter allows for easy integration across various HVAC equipment brands.

Does the 3L03-190 require a manual reset after tripping?
No, this model is an automatic reset switch. It will cycle back to its normal state once the sensing disc reaches the fixed cut-out temperature (170°F or 120°F, depending on the terminal used).

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.