... , fasten 3.6-12KV three-phase ac 50Hz single busbar and single busbar segmentation system and complete sets of switchgears, mainly used ... voltageKV75Rated frequencyHz50Mistress line rated currentA630,1250,1600,2000,2500,3150Branch busbar rated currentA630,1250,1600,2000,2500,31504S thermal stability of ...