Industry use electricity is different with house use. It is three phase voltage. A lot Country eletricity supply is not stable. Some factory location is far from city so that do not have eletricity at all. So that need an diesel generator power. Also, a lot Country diesel is cheap, use generator power is cheap.
Just integrated all switch and line into an box, protect use eletricity and make sure safe. And integrated Ammeter and Voltmeter, so that can see all electricity detail easy.
Breaker. It is made inside of the power box according factory inquiry.
Inside of the power box
Wire line. 5-in-1