Which circuits use closed buses?

　　Usually, the circuit of blocking buses is as follows: rated working current is between 2500 and 2500 A, rated working voltage is 660 V, rated working frequency is 50 HZ, which is limited by 35 power supply and distribution lines. Of course, it is also used in three-phase four-wire power supply and distribution lines. What are the benefits of blocking buses when they are used in such circuits?

　　The original blocked busbar can work in the appeal circuit with the following characteristics: large current transmission, compact structure, high insulation capacity, good interchangeability, easy installation and maintenance, and good electrical performance. That is to say, when using blocked busbar, we must pay attention to whether the circuit used is the common circuit of blocked busbar.