The P100 Series encapsulated pressure control switches from Johnson Controls (PENN) are compact, pre-calibrated, non-adjustable switches designed to control and monitor pressure in refrigeration, air conditioning, and HVAC/R systems. These switches are commonly used for high- and low-pressure protection in compressors, receivers, accumulators, and other pressure-bearing HVAC components.

They are factory-set to specific cut-in or cut-out pressures, with an encapsulated, tamper-resistant design that ensures stability, durability, and protection against environmental factors like dirt, dust, and moisture.

Because they are not field-adjustable, they are ideal for OEM (original equipment manufacturer) installations where consistency and safety are critical.