... year's experience 3.apply to air compressor WHZD-25A smart motor protector Main Function 1,Protect function:Overload,phase failuer ... voltahe etc.2,Error display:With phase A,phaseB,phaseCworking power indicating(any one of the three phases failed,the ... switch, magnetic starter, motor protector, starter delta starter, oil level controller etc. We mainly export to North-America, South-America, Southeast ...