... the house distribution box ,computer center ,electronic information engine room,vigilance monitor center,fire control center,industry automatic control,frequency ... for the AC 50Hz/60Hz . for the TT. TN-S . TN-C .and IT .not over 380V . ... V)140275320385440IEC categoryIINominal discharge current (In)8/20μS (KA)5/10/15/205/10/15/205/ ... /205/10/15/20Max discharge current 8/20μS)(Imax): (KA)10/20/30/4010/20/ ...