CX-12 is a series CX compressor pressure switch. It is designed with a 20A normally closed SPST switch for direct control of pumps and motors. The set point and deadband are both easily adjustable via screw terminals inside the cover. The CX series switch comes with an unloader valve, which prevents compressors from starting under load. It also come with an auto/off disconnect lever for manually cutting off the load. When the lever is in the off position, there is a test button inside the housing that can be pushed to turn on the load.