Flameproof Transwitch Unit is designed for use in underground gassy mines. The unit comprises of a 6.6 KV, 75 MVA, 630A Vacuum Circuit Breaker coupled with 1200 KVA, 6.6KV/1.1KV and 550V air cooled transformer housed in a tank and one LT Chamber on the outgoing side. The total unit is mounted on wheel for easy transportation. The unit is suitable for Restricted Earth Neutral System.