Supco SLP4080 Pressure Switch

The Supco SLP4080 is a heavy-duty, field-proven low pressure switch designed for critical system protection in HVAC and refrigeration equipment. This SPST (Single Pole Single Throw) control is engineered to open on pressure drop at 40 PSI (Cut-Out) and reset when pressure rises to 80 PSI (Cut-In). Built for a broad range of HVACR pressure control applications, it features a 1/4 inch SAE 45-degree female flare fitting with an integrated valve core depressor for direct mounting without secondary hoses. This encapsulated, non-adjustable switch is a direct replacement for Mars 33364 and 5678, making it a versatile HVAC replacement part. Compatible with R22, R134a, R410A, and the latest A2L refrigerants, the Supco pressure switch utilizes a snap-acting stainless steel hermetically sealed sensor to maintain set-point stability throughout its 100,000-cycle life. The automatic reset and 18-inch 18 AWG lead wires simplify integration into 24V, 120V, or 240V control circuits.

• System Safeguard: Prevents compressor damage caused by low refrigerant charge or frozen coils by cutting the circuit at 40 PSI.
• High Compatibility: Direct cross-reference for Mars 33364, Mars 43350, Robertshaw 3100052, and Ranco MPL7014.
• Rugged Construction: Rated for a maximum operating pressure of 700 PSI and a burst pressure of 5,000 PSI to handle demanding industrial environments.
• Streamlined Install: Direct mount design with a built-in valve core depressor eliminates the need for capillary tubes or adapters.

What is the difference between Cut-Out and Cut-In on the SLP4080?
The Cut-Out (40 PSI) is the pressure at which the switch opens the circuit to stop the system. The Cut-In (80 PSI) is the pressure at which the switch closes to allow the system to resume normal operation.

Is this switch compatible with new A2L refrigerants?
Yes, the hermetically sealed stainless steel sensor is designed to be compatible with a wide range of refrigerants, including HFC, HCFC, CFC, and A2L varieties.

Can the pressure settings be adjusted in the field?
No, the SLP4080 is an encapsulated, non-adjustable control to ensure the factory-calibrated set points remain accurate and tamper-proof.

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.