... best protection against over-voltage to HV equipment,for instance,transformers,cables and switcher These products belong to the series4 Station Class ... with Different diameter sheds Metal-Oxide Surge Arresterwithout gap,Voltage class 6.3kV-36kV,all ratings are available from 5kA ... allratings are available from 5kA to 10kA. Series 4 Station Class Surge Arrester, 54~258kV,all ratings are available from ...