- A new type of intelligent hybrid arcless AC contactor was introduced.
- Inside is installed AC contactor,thermal relay,self-settable universal conver-sion switch.
- The development of Wizard design system for AC contactor was introduced briefly.
- The mathematical model of AC contactor is built, and its power quality susceptivity have been carried through simulation research.
- Inspect regularly whether the wires are loose, the terminal(s) of AC contactor is(are) well, it shall be repaired in time whenever there is failure.