... 3.apply to air compressor WHZD-25A smart motor protector Main Function 1,Protect function:Overload,phase failuer,block, ... :notmore than 50%,relative higher humidity is allowed in lower temperature ≤90%3,Environmental pollution grade;3 grade. 4,Aplace ... , including ac contactor, air pressure switch, magnetic starter, motor protector, starter delta starter, oil level controller etc. We mainly export ...