The high voltage chamber of a European box transformer is generally composed of high voltage load switches, high voltage fuses, lightning arresters, etc. It can perform power outage and transmission operations and has overload and short circuit protection. The low-voltage chamber is composed of low-voltage air switches, current transformers, ammeters, voltmeters, etc.

In the construction (renovation) of rural power grids, it is widely used in the construction and renovation of 10-110kV small and medium-sized substations, factories, mines, and mobile operation substations in urban and rural areas. Due to its ease of penetrating into load centers, reducing power supply radius, and improving terminal voltage quality, it is particularly suitable for rural power grid renovation and is known as the target mode of substation construction in the 21st century.

The voltage levels of domestically produced European box transformers are 3-35kV on the high voltage side and 0.4-10kV on the low voltage side. The capacity of the transformer: When the rated voltage ratio is 35/10, 6, 0.4 kV, it can range from several hundred kilovolt amperes to tens of thousands of kilovolt amperes, and when the rated voltage ratio is 10, 6/0.4 kV, it can range from tens of kilovolt amperes to several thousand kilovolt amperes.