The vacuum interrupter is generally accepted as reliable circuit breaker in the medium voltage power system , but the operating thoroughly a high inductive loads and capacitive loads caused a significant damages with severe erosion in the surfaces both of cathode and anode vacuum Interrupter . This paper remedies both of arcing currents , chopping currents and prevents a high transient voltages (TRV) due to process of switching interrupters . We are still using the conventional theory for de-signing of medium voltage switching system but by using a semiconductor materials such as Thyristors cir-cuit as a compact construction for adaptive to be an ideal switching device for medium voltage offers the facilities for shifting the full arcing currents and cur-rent chopping between two electroplates this paper presents on the existing of copper-chrome interrupters Cu-Cr30. Thus for enhanced durability of dielectric properties.