The frame of  is a C-type combined structure, and the structural parts are all galvanized or made of aluminum-zinc-plated sheet. Through the 8.8 grade self-tapping hexagonal screws locking connection into the basic framework, and then according to the program change needs, together with the corresponding we, sealing plate, partition, mounting bracket, as well as the busbar, functional units and other components, assembled into a complete device. The dimensions of components and compartments in the device are modularized (modular unit E=25mm). Vertical channels and primary and secondary connectors are in the form of GCK cabinets, and horizontal busbars can be placed on the top of the cabinet, with the top cover open, and can be used in either a rear or side appearance mode. While maintaining the original working performance and appearance, it reduces the production cost. Cabinet protection grade IP3X-4X.