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 automatic blower control to your Lennox pellet or gas stove with this 140°F blower snap switch. Also known as White Rodgers 3F01-140, this surface-mount, low-limit switch is normally open and closes at 140°F, then reopens at 120°F—ensuring the blower only runs when needed. It features automatic reset and is rated for high-cycle performance across both resistive and inductive loads.

Key Features:
✅ Automatic Reset – Closes at 140°F and reopens at 120°F for hands-free operation
✅ Reliable Fan Control – Ensures the convection blower activates at proper temperature
✅ OEM Equivalent – Direct replacement for Lennox H5875, 610049, and White Rodgers 3F01-140
✅ High Durability – Rated for 100,000+ cycles under various electrical loads
✅ Surface Mount with Gold Contacts – Stable, responsive thermal response

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 / 1 min

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

This 140°F blower switch is essential for safe, efficient fan operation in your Lennox heating system. Whether you’re replacing a failed component or upgrading for reliability, it offers long-lasting performance. Order now and restore automatic blower control to your pellet or gas stove!