Ring main unit is used in the secondary distribution system.  

It has three no of switches (CB or Isolation or load breakers unit) Two used as inputs with mechanical/electrical interlock and one output. In some cases it is used in a ring formation along with other units in the same ring, so as to have very little down- time of the remaining system in case of failure of a particular section.

RMU normally comes with LBS on both sides of the T and T has a CB which feeds the transformer.

They come in standard rating of 11/22/33KV, 630/1250A, 200A, 21KA/3sec.

RMU is compact, and relatively cheap.


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