The drawer is provided with a mechanical interlocking device and an emergency unlock device.

Each device can install a maximum of 11 unit drawers or 22 1/2 unit drawers.

The drawer has five positions of opening, closing, testing, withdrawing and isolating, and has obvious marks.

The horizontal busbar adopts a flat arrangement behind the cabinet to enhance the ability of the busbar to resist the electrokinetic force generated by the short-circuit current.

Each functional compartment is strictly separated, and its compartments are mainly divided into the functional unit compartment and the cable compartment. The functions of each unit are independent of each other and do not affect each other.

The drawer types are divided into five size series of 1/2 unit, 1 unit, 3/2 unit, 2 unit and 3 unit, and the rated current of the circuit is 400A or less.