GYB series box type substation (referred as the BS) apply to the three-phase AC system with 10/0.4KV system nominal voltage , which was used to reception and distribution of currency. This product was serialized, modular, powerful, and fully equipped, which has beautiful appearance, easy maintenance, safe and reliable operation, it fully meets IEC1330 standard requirements, and it can realize intelligent operation. It was applicable to urban public distribution, street lighting power supply, industrial and mining enterprises, high-rise buildings, living quarters, oil terminals ,project temporary construction and other places. This product can access load center, which reduced line losses,which is an ideal power distribution equipment of urban and rural power grid construction .