The functional unit of the drawer switch cabinet is separated from the bus or cable by a grounded metal plate or a functional plate made of plastic, forming three areas of bus, functional unit and cable. There are also isolation measures between each functional unit. Drawer-type switchgear has high reliability, safety and interchangeability. It is a relatively advanced switchgear. Most of the switchgear produced are drawer-type switchgear. They are applicable to industrial and mining enterprises and high-rise buildings that require high reliability of power supply, and serve as centralized control distribution centers.