YBM-12/0.4 Series Prefabricated Substation is the complete power distribution device with compact structure, integrating high-voltage switch,transformer and low-voltage electrical equipment,applied in urban buildings,small & medium-sized factories, mines, oil fields, temporary construction sites using electricity,etc.,used to receive and distribute electric energy in the power distribution system. The product has the features,such as strong completeness,small volume,compact structure,safe and reliable operation, convenient maintenance, and mobility.Compared with the conventional civil construction type substation, the area of the box-type substation enioying the same capacity is only 1/10-1/5 of that of the conventional substation, which greatly reduces the design workload and construction volume, and lowers the construction costs.