Johnson Controls P47AA-4 20" SPST Open High Pressure Switch 50 PSI

The Johnson Controls P47AA-4 is a single pole single-throw open-high pressure switch that is suitable for HVAC equipment. It is used as a safety device, and it closes an electrical circuit when the pressure is beyond a certain level. It has a pressure range of 50 PSI and is expected to trip the circuit in case the pressure goes beyond 50 PSI. This is used to protect equipment from being damaged under circumstances of high pressure. When the system pressure gets to the set point, the electrical circuit is broken to avoid any form of overpressure harm. It is commonly used in air conditioning and refrigeration systems where it acts to safeguard compressors and other components.