Ring main unit is used in a secondary distribution system. It is basically used for an uninterrupted power supply. A standard piece of switchgear in distribution systems comprising of switches for switching power cable rings and of switches in series with fuses for the protection of distribution transformers. RMU used for H.T. side. RMU is having 3sets of switches (Circuit Breakers or Isolators or LBS), it is used for two inputs with mechanical or electrical interlock and one outgoing to the load. Either one input with two outgoings
1.Minimum area for installation
2.No Civil Work
5.Short time for installation and startup
6.Increasing the operators security during working with electrical parts
7.Integrated panel with high electrical safety.