Crompton Greaves make 11/22/33KV RMU (Ring Main Unit) working / operation.

Please note, at the last of this video I have by mistakenly said the closing coil & tripping coil but its actually closing spring & tripping spring.
In this video, I have explained the RMU of 22KV line but for 11KV & 33KV line RMU is exactly same only the SF6 gas (Sulphur hexafluoride gas) chamber is of their respective voltage capacity.