The Johnson Controls P77AAA-9300 is part of the P77 Series Electronic Pressure Controls. These are direct-mount, encapsulated electronic pressure switches designed for HVAC and refrigeration applications. The P77AAA-9300 is a factory-calibrated, non-adjustable model with automatic reset and SPDT contacts, intended for high-pressure cutout or fan cycling control.

• Type: Electronic Pressure Control (Encapsulated Switch)
• Series: P77AAA (part of the P77 family)
• Function: Provides snap-action switching based on refrigerant pressure.
• Reset Type: Automatic reset (trip-free design prevents override).
• Mounting: Direct-mount with 1/4 in. SAE flare fitting and Schrader-type depressor.
• Encapsulation: Compact, dust-tight, and rugged for harsh environments.

 Specifications