The Ring Main Unit (RMU)

In my work as an Assistant Engineer, Distribution Operation here at Dubai Electricity and Water Authority, I always meet this robot look-a-like machine. But it's not a robot, it's called RMU.

The Ring Main Unit (RMU) is a type of switchgear used in the distribution networks that is normally formed by interconnecting a number of ring shaped grids. It is designed to operate at the rated nominal system voltage of 11kV and is normally consist of switches on both sides of the T-off, one to open the ring and another at the connection to the distribution transformer (usually rated 1000kVA) using one of the following:

    Swith and fuse separately
    Switch-fuse combination
    Circuit breaker