In August 2013, our ZN139/D-12 permanent magnet vacuum circuit breaker products received the qualification review of qualified supplier products conducted by Yankuang Group, and successfully short-listed by the group relying on the performance advantages of the product, thereby laying sound foundation for the future cooperation. Since 2007, our company's permanent magnet vacuum circuit breaker products have started to be used in the major industrial and mining enterprises, and made many achievements, such as Zhaoyuan Gold Mine, Buliangou Coal Mine, Dachang Coal Mine, Huaiyin Salt Mine, Panzhihua Iron and Steel Group, and received praise operation report from a number of cooperation units.