1 Rated voltage kV 252
           2 Rated current A 2500、3150、4000
           3 Rated short-time withstand current kA    50/3s
           4 Rated peak withstand current kA 125
           5 Rated lightning impulse withstand voltage kV Across open breaks 1050+200
           To earth 1050                                                                                                                         6 Rated 1min power frequency
           withstand voltage kV Across open breaks 460+145
           To earth 460