Overview: ZN85-40.5 of indoor high-voltage vacuum circuit breaker is the main switchgear in power transmission and distribution equipments. It applies to the system with three-phase AC frequency 50Hz and 40.5kV of rated voltage. In power transmission system, it has control and protection effects. In particular, it is suitable for electric arc furnace transformer, capacitor bank and other places with frequent operation.

Such breaker adopts integration and modular design, and the entire structure is simple and proper. It is arranged from up and down. Arc extinguish chamber is on the top while interlock and operating parts are on the bottom. It uses specialized spring operating mechanism, no need of adjustment, and the action is stable and reliable. The vacuum arc-extinguishing chamber of three-phase conducting loop is arranged in enclosed insulating cylinder. Its insulating cylinder is made from epoxy resin materials with reliable electromechanical properties by means of mature vacuum pouring process technique. So it not only remarkably improves the insulation property between phases but also make every loop be free of influence of outside severe environment, so that prevents dust and foreign matters  from entering main loop parts.

Shandong Huineng Electric Co., Ltd, located in the "ancient capital of Qi"-Zibo City , is a innovative growth enterprise which has leading products of high-low pressure electric complete set of equipments and integrated scientific research and development , production and operation and technical service. Built in Aug, 2003, up to now,the company has completed 75 million yuan of registered capital, and over one hundred million yuan of fixed assets; it has more than 280 employees, among which above 80% employees with education background of technical secondary school above. Over the years, based on the concept to pursue excellence and the spirit of open innovation, it devotes itself to providing high-quality product and service to SGCC and broad users' projects and increasingly develops into the well-known enterprise in manufacturing industry of electric equipments in complete set in China.

Since the establishment of company, it has continuously established power transmission and distribution engineering and technological research center of Zibo City through close cooperation with Xi'an High-voltage Electrical Appliance Institute, Shandong University of Technology, Schneider (China) Electric Company and many scientific research institution, universities and colleges and multinational corporations, promoted the technology level and internal quality of products, and gradually realized the product structure pattern of "No one I have and I have excellent" covering extensive fields, which greatly enhances the core competence of enterprise.

The company always persists in taking quality control as center, positively integrates with the international advanced quality control modes, takes the development road of quality and benefit, establishes a whole set of perfect quality control system, successively gets ISO9001：2008 quality authentication certificate and "3C" certificate for low voltage product, as well as the first to pass electric energy product authentication in the same industry in China.

The company has excellent processing equipments, advanced production process and complete detection facilities. Since 2004, it has successively invested heavily to introduce numerical control press, numerical control plate shears, numerical control bending machine, full-automatic numerical control busbar processing machine and other CNC machining equipments with world leading level, built up 800m2of three-dimensional material warehouse, and two production lines for VS1 and ZN85 breaker. It firstly sets up the product partial discharge test room in the same industry in China, which promotes the equipping level of enterprise and increasingly enhances the vitality of sustainable development of enterprise.

For years, with product marketing of company being continuously strengthened and expanded, it successively provides the first digital substation--Tianjin Chenfu 220KV substation, Tianjin Lutai 500KV switching station project, power company limited of northern Hevei province, Jiangsu electric power company, China Petroleum Pipeline Bureau, Shengli power station and other major projects and users in China with high-quality products and service and wins universal praise.

The fittest Survives in market competition. At present, facing to the new opportunities and new challenges brought by state smart grid, we will continuously focus on clients, strive to explore the best management mode suitable to features of our company, reinforce standardization operation and sincerely cooperate with vast customers depending on reliable quality, the price with competitive power and perfect after-sales service to make positive contribution to the development of electric power of China.