ZGS series combined transformer, also known as American-style box-type transformer, is a series of products developed to meet the needs of urban and rural power grid construction, development, and transformation. It is a transformer that integrates the transformer active part, switchgear, fuses, tap changers, low-voltage distribution devices, and other corresponding auxiliary equipment, capable of meeting various configuration requirements such as energy metering, reactive power compensation, and low-voltage branching. As an independent complete power transformation and distribution assembly for 6–10kV AC 50Hz power grids with a rated capacity of 30–1600kVA, the ZGS series combined transformer can be used both outdoors and indoors. It is widely applicable to industrial parks, urban residential areas, commercial centers, road lighting, high-rise buildings, temporary construction sites, and other locations. Its advantages include: environmental protection, small footprint, and convenient installation.