The High and low voltage switchgear is a device connected to high voltage or low voltage cable. It is primarily used by power supply bureaus and substations. High-voltage cabinets interface with power transformers for step-down to low-voltage cabinets, which then distribute power to individual distribution boxes.

This equipment integrates various switchgear, circuit breakers, and protection devices. The outside line connects first to the main control switch in the cabinet and then to the sub-control switches. Each branch is configured for specific needs such as instruments, automatic control, motor magnetic switches, AC contactors, and high/low voltage rooms.