The low voltage switchgear is a device connected to low voltage cable. General power supply bureaus and substations use high-voltage cabinets, and thru the power transformer for step down to low-voltage cabinets, then thru low-voltage cabinets to each power distribution box. It is an electric equipment assembled of some switchgear, circuit breakers, protection devices and circuit breakers etc.The high and low voltage switchgear is an electrical equipment. The outside line firstly enters to the main control switch in the cabinet and then enters to the sub-control switch. Each branch is set according to its needs Such as the instrument, automatic control, motor magnetic switch, various AC contactors, high voltage bus and low voltageoom switch cabinet etc.