Beijing Herui SEL Power Sci. & Tech. Co., Ltd., a high-tech enterprise focusing on power system and a professional supplier of medium voltage (12/24kV) power distribution equipment and technical proposals, provides five series of products, including Ring Main Units, cable sectors and accessories, prefabricated substations, on-pole switches, FTU devices and fault indicators, and it is ISO9000 certified and is a high-tech enterprise in Beijing.