High-voltage ring cage: In theory, this kind of electrical appliance is specially used for communication between multiple power sources (substations or lines), but in practice, the medium and high-voltage ring cage (except for the communication of a single ring cabinet in a switch station) is generally used as a high-voltage junction box, and its purpose is the same as that of a low-voltage junction box.

One in and three out: the high-voltage junction box has a power supply inlet and three branch lines of consumer appliances, which were previously connected in parallel by buses.

Why not one in and one out: one in and two out? In addition, due to the needs of manufacturers or users, this kind of electrical appliances can be made into many types: for example, one in and one out, one in and two out, one in and four out, one in and five out, and most of them are enough. It is suggested to build a switch station room to store such electrical appliances.

I hope it helps you.