The SN8 breaker has been out-of-date since the initial stage of 80’s

and the usage of them in power system are mainly limited to the power plant’s auxiliary power supply. The main problems taking place during its frequent operations and the cause of its inconvenience to them were analyzed and an approach for equipment option and replacement was recommended in this article. For its high frequency operation to devetope a specidl device for control was considerd necessary.