Johnson Controls P100CP-38C Encapsulated Pressure Switch 500/325 PSI SPST Auto Reset

The Johnson Controls P100CP-38C is a factory-calibrated, encapsulated pressure switch from the PENN P100 Series — designed for reliable high-pressure cutout protection in commercial refrigeration and HVAC/R systems. This compact, direct-mount control features snap-action On/Off switching with a cut-out (Co) setpoint of 500 PSI and a cut-in (Ci) setpoint of 325 PSI, and is non-adjustable to ensure consistent, repeatable performance.

The P100CP-38C is configured as SPST, Open High with Automatic Reset, meaning the switch opens on pressure rise and automatically resets once pressure drops back to the cut-in setpoint. It connects via a 1/4" female SAE flare fitting with integrated Schrader valve depressor for direct mounting to refrigeration service ports or pressure taps — no separate brackets required. Electrical connections are made via 24" flying wire leads.

Key Features:

• Cut-Out (Co): 500 PSI ± 10 PSI
• Cut-In (Ci): 325 PSI ± 10 PSI
• Switch Action: SPST, Open High
• Reset Type: Automatic Reset
• Pressure Connection: 1/4" Female SAE Flare with Schrader Valve Depressor
• Wire Leads: 24" flying leads
• Compatible Refrigerants: All non-corrosive refrigerants including R-22, R-134a, R-404A, and R-410A
• Factory-calibrated, non-adjustable setpoints for consistent performance
• Compact encapsulated housing for direct-mount installation

Typical applications include commercial refrigeration systems, air conditioning condensers, ice machines, food service equipment, and computer room air conditioning (CRAC) units. Also known as the P100CP38C. Alternate part number: 011066201113594.