The ZGS type combined transformer ( also known as an American-style prefabricated transformer ) is an outdoor prefabricated substation that integrates the transformer body, high-voltage load switch, fuses, and other core equipment into a single oil tank. It is suitable for ring network power supply, dual power supply, or terminal power supply systems, and is a series of products developed to meet the needs of urban and rural power grid construction, development, and renovation. It can meet various configuration requirements of users, such as power metering, reactive power compensation, and low-voltage branching.

The ZGS type combined transformer is an independent complete power distribution unit with a rated capacity of 30~1600kVA for AC 50Hz, 6~10kV power grids. It can be used both outdoors and indoors. It is widely applicable to various places such as industrial parks, urban residential areas, commercial centers, street lighting, high-rise buildings, and temporary construction sites. Its advantages are: environmental protection, small footprint, and convenient installation .