The  frame is a combination structure, the basic skeleton is composed of C-type steel
Each cabinet is divided into three compartments, i.e. horizontal busbar compartment, drawer cubicle and cable compartment. The compartments are separated from each other by steel plates or high-strength flame-retardant plastic function boards, and there is a metal plate with ventilation holes between the upper and lower drawers, which effectively prevents accidents caused by flying arcs caused by faults of switching elements or short circuits of busbars and other lines. Compact design: a smaller space to accommodate more functional units. Structural components of strong versatility, flexible assembly, E = 25mm for the module, the structure and drawer unit can be combined at will to meet the needs of the system design busbar with high-strength fire-retardant type, high insulation strength of the plastic functional protection, with resistance to fault arcing performance, so that the operation and maintenance of safe and reliable. The mechanical interlocking mechanism of various sizes of drawers meets the standard regulations, with three obvious positions for connection, test and separation, which is safe and reliable. The material can be made of electroplated cold rolled plate, galvanized plate, aluminum zinc dressing plate.