Carrier HK02SA420 High Pressure Switch 660-505 PSI

The Carrier HK02SA420 is a High-Pressure Switch that is used in Carrier HVAC systems which include air conditioners and refrigeration systems. If the refrigerant pressure is higher than the open pressure of 660 PSI, the switch blows the circuit and turns off the system. On the other hand, when the pressure goes below the close pressure at 505 PSI and returns to a safe range the switch opens allowing the circuit to complete possibly restarting the system. This switch plays the role of controlling refrigerant pressure to protect the Carrier HVAC system from being damaged by high-pressure conditions.