High voltage complete distribution equipment is a high-voltage distribution device assembled from equipment supplied by manufacturers and delivered to the site. It divides the main electrical circuit into several units, each unit is a circuit, and the circuit breakers, isolation switches, current transformers, voltage transformers, as well as protection, control, measurement and other equipment of each unit are centrally assembled in a whole cabinet (usually referred to as one side or one high-voltage switchgear). The power device composed of multiple high-voltage switchgear installed in power plants, substations or distribution stations is called a complete distribution device.

High voltage complete distribution equipment can be divided into metal enclosed, metal enclosed armored, metal enclosed box, SF6 enclosed combination electrical appliances, etc. according to their characteristics; According to the installation method of the circuit breaker, it can be divided into fixed type and handcart type; Divided into outdoor and indoor types according to installation location; According to the structure of the cabinet, it can be divided into open and closed types.

The switchgear has the "five prevention" interlocking function, which includes preventing accidental disconnection and circuit breaker, preventing load pulling and closing isolation knife switch, preventing live wire closing grounding knife switch, preventing grounding wire closing circuit breaker, and preventing accidental entry into live interval interlocking function. The "five prevention" interlocking function is often achieved through mandatory mechanical locking or electromagnetic locking between circuit breakers, isolating switches, grounding switches, and cabinet doors.