This product is a development item about new product released in 1985, with international technical parameter, fills in domestic blank and appointed as the product which can replace imported product. Adopt assembled structure in frame and bolt in combination, E=20mm in open cell installation size, zincification and phosphor processing in all interior components. Cabinet can be divided into three areas, PE area, electrical equipment area and cable area to ensure security of electrified body without exposure. All of operation handles are equipped in frame outside to ensure successful operation of switch with opening the door. Adopt three-phase five-wire in electricity distribution system design in this kind of switch cabinet. N wire and PE wire combined under the cabinet. The cabinet equipped with reliable earthing wire to guarantee earthing combination between each unit and PE wire. This product accords with IEC439 international standard and GB7251-87 state standard with high defending level. Fit for electricity generating and distribution system which working voltage not more than 660V. It can be applied as charge center, electromotor control center, platform for shipping and petroleum exploitation on the sea, as well as nuclear power station and so forth.