... high-voltage switchgear applied to distribution substations of industrial and mineral enterprises, of 3, 6,10KV 10KV high-voltage switchgear I. SummaryI ... mineral enterprises, of 3, 6,10KV 3 phase 50Hz AC system for electricity distributing, particularly suitable for occasions of ... requirements of the national standard GB 3906-1991 AC metal-enclosed switchgear for rated voltage of 3-35kv, in addition ...