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Trinary pressure switches provide a simple and effective option for AC system pressure control. The pressure switch typically disconnects power supply to the compressor clutch to protect the compressor during abnormally high system pressure conditions and abnormally low system pressure conditions. there is a third function built into the switch which typically controls a radiator shutter system or a fan that controls airflow to the condenser. Thread: 3/8 - 24 Male Function 1: High Pressure Protection Function 2: Low Pressure Protection Function 3: Shutter or Fan Control Normally Open Terminals: 4 Connector: .250 Male Spade Mating Connector: 71R4501