Bus coupler switch
A switch has an isolating switch on two rows of parallel busbars, and the connecting switches of the two busbars are the busbar switches. For example, the connection switch of the east-west or the north-south mother.
Busbar segmentation switch
When the double bus is called the bus, when it is a single bus, it is called a segment.
The busbar (which we call a single-master segment), the middle connection switch is the segmentation switch of the busbar. Any line can only be connected to the I or II bus.