Lennox Blower Snap Switch 140-20F (H5875 / 610049 / 3F01-140 / 20161) – Automatic Reset Fan Switch

Lennox Blower Snap Switch 140-20F (H5875 / 610049 / 3F01-140 / 20161) – Automatic Reset Fan Switch

Restore precise, automatic blower control to your Lennox pellet or gas stove with this 140°F blower snap switch. Also known as the White Rodgers 3F01-140, this surface-mount, low-limit switch is normally open and closes at 140°F before reopening at 120°F—ensuring your blower activates only when needed. Featuring automatic reset and gold contacts for reliable performance, this OEM-equivalent switch is built for long life and high-cycle durability.

Key Features

• Automatic reset – closes at 140°F and reopens at 120°F for hands-free temperature control
• Reliable fan operation – ensures the convection blower activates only at the correct temperature
• OEM-equivalent replacement – direct substitute for Lennox H5875, 610049, and White Rodgers 3F01-140
• High durability – rated for 100,000+ cycles across resistive and inductive electrical loads
• Surface-mount design – includes gold contacts for stable thermal response and improved conductivity

Specifications

• Part Numbers: H5875, 610049, 3F01-140, NBK-20161
• Type: Snap disc switch
• Mounting: Surface-mount
• Reset Type: Automatic
• Function: Close on rise (normally open)
• Close Temperature: 140°F ± 7°F
• Open Temperature: 120°F ± 7°F
• Disc Size: 3/4"
• Electrical Ratings:
 – 125VAC, 15A / 250VAC, 8A resistive
 – 120VAC, 5.8FLA / 34.8LRA
 – 240VAC, 2.9FLA / 17.4LRA
 – Gold contacts: 30VDC, 1A / 120VAC, 125VA
• Environmental Range: -40°F to 350°F
• Approvals: UL, C-UL, RoHS compliant
• Dielectric Strength: 1,500 VAC for 1 minute

Compatible Lennox Models

• Bella
• Winslow PS40, PI40
• Designer I, II, III B-Vent Inserts
• DVS1, DVS2
• Epic
• Firestar DVS1, GS2, GC2, GC3
• Medina
• Ravenna (33, 40, 55500, 55503)
• SDVI
• Teton
• Vintage
• Vision

Why Choose the Lennox 140-20F Snap Switch

This 140°F blower switch is a vital component for maintaining safe, automatic blower operation in your Lennox heating system. Designed for performance and longevity, it offers consistent thermal control for smooth, efficient stove operation. Whether you’re replacing a worn part or upgrading for reliability, this automatic reset fan switch ensures long-lasting, dependable results. Order now to restore automatic blower control to your pellet or gas stove!