Supco SFC300400 Switch

The Supco SFC300400 is an encapsulated, non-adjustable fan cycling pressure switch designed for heavy-duty service in refrigeration and air conditioning systems. Engineered for R410A application, this SPST (Single Pole Single Throw) control features a close on pressure rise logic, making it a critical component for managing condenser head pressure in low ambient conditions. With a precise 400 PSI cut-in and 300 PSI cut-out rating, it ensures consistent fan operation to maintain system stability. The unit is equipped with a 1/4 inch SAE 45-degree female flare fitting and an integrated valve core depressor for direct mounting on the high-side service port. Built with a snap-acting stainless steel hermetically sealed sensor, it provides high set point repeatability and durability under demanding mechanical vibrations. This high-pressure switch is rated for 24V, 120V, and 240V AC circuits, offering versatile compatibility for commercial technicians and residential contractors alike.

• Optimized Head Pressure Control: Essential for maintaining proper compression ratios in R410A systems during cold weather startups.
• Rugged Hermetic Seal: The stainless steel sensor is hermetically sealed to protect against moisture, dust, and refrigerant leaks.
• Direct Mount Connectivity: Features a standard 1/4 inch SAE female flare for quick installation without additional capillary tubes.
• High Electrical Capacity: Rated for up to 5.8 FLA at 120V, supporting a wide range of fan motor loads.
• Automatic Reset: Simplifies system recovery by automatically cycling the fan once pressure thresholds are reached.

What is the primary application for the Supco SFC300400?
This switch is typically used as a condenser fan cycle control. It closes the circuit to start the fan when head pressure reaches 400 PSI and opens to stop it when pressure drops to 300 PSI.

Is this switch compatible with newer A2L refrigerants?
Yes, the SFC300400 is designed to be compatible with a broad range of refrigerants, including HFC, HCFC, and newer A2L classifications.

How do I wire the SFC300400 into an HVAC system?
As an SPST switch with 18-inch wire leads, it is wired in series with the condenser fan motor or the contactor coil that controls the fan, depending on the system voltage and amperage requirements.

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.