Supco SHP400280 Pressure Switch

The Supco SHP400280 is a heavy-duty, commercial-grade high pressure switch engineered for precision system protection in HVAC and refrigeration equipment. Designed as a single pole single throw (SPST) control, this encapsulated switch features a critical 400 PSI cut-out (open) and a 280 PSI cut-in (close), providing an automatic reset function once head pressures stabilize. As a professional-tier HVAC pressure control, the SHP400280 utilizes a hermetically sealed, stainless steel snap-action sensor to ensure long-term set point stability even in high-vibration environments. This direct mount pressure switch is fully compatible with HFC, HCFC, and CFC refrigerants, including modern A2L blends, making it an essential refrigerant pressure control for contemporary field service. This unit serves as a direct technical replacement for S1-025-17620-022 and Mars 43330, meeting or exceeding original equipment manufacturer requirements for high-side safety monitoring.

• Universal Compatibility: Validated for use with all major refrigerants, supporting modern system retrofits and legacy repairs.
• Rugged Construction: Features a 1/4 inch SAE female flare fitting with a built-in valve core depressor for secure, leak-free installation.
• Electrical Versatility: Rated for multiple voltages (24V, 120V, and 240V AC) to suit diverse residential and commercial control circuits.
• Superior Reliability: The hermetically sealed sensor prevents moisture ingress and eliminates the common failure points found in open-frame switches.
• Installation Ready: Comes standard with 18-inch, 18 AWG UL1015 wire leads for flexible routing within tight condenser cabinets.

Is the SHP400280 an automatic or manual reset switch?
This model is an automatic reset switch, meaning it will re-close the circuit once the system pressure drops to the 280 PSI cut-in set point.

Can I use this switch on the low side of the system?
No, this is specifically a high pressure switch that opens on pressure rise. For low-side protection, a dedicated low pressure switch with lower PSI set points should be used.

Does this switch require a specific mounting orientation?
As a direct-mount, encapsulated control, it can be installed in any orientation, though it is standard practice to install it vertically to minimize debris accumulation at the sensing port.

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.