Designed for use in underground gassy mines. The equipment comprises of a 3.3KV 75MVA 400A / 6.6KV 150MVA 630A vacuum circuit breaker coupled with 315KVA, 500KVA, 6.6KV - 3.3KV / 550V - 1100V air cooled transformer and one LT chamber. The equipment is approved by DGMS Dhanbad for use in underground gassy mines and suitable for Restricted Earth - Neutral System.