... semiconductor power electronic devices and new type of motor start-up andrunning protection products which are made ... the protection of over-current, three-phase current imbalance, overload, lack phase, phase sequence. 7. Fault self-diagnosis, ... installation . Main Technical Index>>> 12. apply to motor, squirrel-cage three-phase asynchronous motor 13. rated voltage, frequency: AC380V.660V, 1140V ...