... , phase loss, overvoltage and current leakage etc. PurposeQBZ-200(120,80)/1140(660,380) mining explosion-proof vaccum electromagnetic ... measurement of the protector conforms to JDB-80,120,200,,users can upgrade the original stater easily,just ... device. Technical DataRated power(V)1140,660,380Rated current(A)200,120,80Work frequency(Hz)50Current AdjustmentCurrent Level decidedProtectorSelf-testing ...