The High and low voltage switchgear is a device connected to high voltage or low voltage cable. General power supply bureaus and substations use high-voltage cabinets, and through the power transformer for step down to low-voltage cabinets, then through low-voltage cabinets to each power distribution box.

It is an electrical equipment assembly comprising switchgear, circuit breakers, protection devices, and more. The external line enters the main control switch in the cabinet and subsequently enters the sub-control switches. Each branch is configured for specific needs such as instrumentation, automatic control, motor magnetic switches, AC contactors, and high/low voltage room components.