... the electro-motor. The device has 4 structures of a, b, c, d ,to enable different application modes such as ... practicability of the system. Besides,the high-resolution A/D converter and the detection method of single measuring ... overload, short circuit, electricityleakage, insulation monitoring, overvoltage, undervoltage, three-phase imbalanceetc.;6. It has the RS485 communication function, which can ...