Counters in the home, called metal armored away switching equipment in the home. Belong to high voltage electrical installations, the maximum operating voltage of 3.6 / 7.2 / 12kV, three-phase AC 50Hz single busbar in the system or dual-bus sub-system indoor power distribution equipment. For receiving power and network with 3.6-12kV of, and exercise control power circuit protection, monitoring and measurement. The home switch cabinet is mainly used by power plants, small and medium generator power transmission, power system of secondary substations, transmission, and distribution of industrial and mining enterprises, as well as large high-voltage motor starter and so on. Drawer storey modulus of 160mm, unit circuit rated current of 400A and a lower per MCC cabinet drawer drawers can be installed up to 11 units of a drawer or 22 half unit into the outlet according to the size of the current number of pieces with different The same connector specification sheet drawer unit structure of a mechanical interlock device \