When distribution boxes are used in large power supply system, they are divided into different levels for better distribution control. Generally speaking, the power supply system will have primary, secondary and lower levels. These three levels of power distribution equipment

MNS draw out switchgear, commonly referred to as a switchboard or distribution board, is an open switchgear with a panel cover. The front has a protective effect, while the back and side can still contact the live parts. The level of protection is very low. It can only be used in industrial and mining enterprises with lower requirements for continuity and reliability of centralized power supply of substation. Protective (i.e. enclosed) switch cabinet refers to the low-voltage switch cabinet with all sides closed except the installation surface.

The electrical components of the cabinet, such as switch, protection, monitoring and control, are installed in a closed shell made of steel or insulating materials, which can be installed on the wall or on the wall. Isolation measures can not be taken between each circuit in the cabinet, or grounding metal plate or insulating plate can be used for isolation.

Generally, the door is mechanically interlocked with the main switch. In addition, there is a protective desktop switch cabinet (i.e. console). The panel of high and low voltage distribution box is equipped with control, measurement, signal and other electrical appliances. Protective switchgear is mainly used as power distribution device in process site.