It is designed and developed by our own company by bringing in international advanced technology,considering our own country's specific power supply.It performances meet IEC420《AC H.V. Load Switch with Fuse》(1990 Edition)and GB3804 《3-63kv AC H.V.Load Switch》after strict test and long-time operating. Compared to the product of the kind in the foreign country,its technical parameter has reached the international level with the features of small volume and light weight. Can be used widely in 12kv distribution network to protect the equipment against working without phase. The success of the product fills the domestic gap,with functions of switch,isolating and earthing.