Honeywell 3f01-350 Snap Disc Fan Switch 350F Cut-in

Product Description

The HONEYWELL 3f01-350 is a snap disc fan switch control used in high-temperature airflow applications to automatically open and close a fan circuit based on temperature thresholds. The switch activates at a cut-in temperature of 350 degrees F and deactivates at a cut-out temperature of 320 degrees F. This bimetal snap disc design provides reliable, self-actuating switching without external power to the sensing element. It is commonly installed by HVAC technicians in furnaces, duct heaters, and similar heating equipment where automatic fan activation and shutdown based on heat exchanger temperature is required.

This snap disc fan switch is suited for residential and light commercial heating applications where a fixed-temperature fan control is needed. It mounts directly in the airstream or on the heat exchanger surface and responds to rising and falling temperatures to cycle the indoor blower. It is typically installed during system commissioning, control board replacement, or when an original fan switch has failed or drifted out of calibration.

Key Features

• Cut-in temperature of 350 degrees F initiates fan operation when heat exchanger reaches set point
• Cut-out temperature of 320 degrees F shuts down fan as system cools
• Snap disc bimetal design provides positive, repeatable switching action
• Self-actuating temperature sensing requires no separate power to the sensing element
• Compact form factor suits direct surface-mount or duct-mount installation

Compatibility

Designed as an OEM-style replacement snap disc fan switch for residential and light commercial gas furnaces and duct heating equipment requiring a 350 degrees F cut-in and 320 degrees F cut-out temperature control.

Installation Notes

Installation should be performed by a qualified HVAC technician. Disconnect and lock out all power to the furnace or heating unit before removing or installing this switch. The switch must be mounted securely against the surface being sensed to ensure accurate temperature response. Follow applicable local codes and manufacturer wiring diagrams when connecting the fan circuit leads.

Technical Specifications

• Cut-In Temperature: 350 degrees F
• Cut-Out Temperature: 320 degrees F
• Switch Type: Snap Disc
• Function: Fan Switch Control

Standard Information

• Brand: HONEYWELL
• Manufacturer Part Number: 3f01-350