Abstract: The safe and reliable switching of plant electricity 6 kV/10 kV system is the premise of normal operation of some important auxiliary generators.Taking the plant electricity quick-switching device in Type MFC2000-6 plant as an example,the application and existing problems of various switching modes of quick switching device in practical production are expounded.The typical switching failure of the quick-switching device of MFC2000 series is discussed,and prevention measures are put forward combined with the actual production,so as to provide reference for similar power plants in the application of plant electricity quick switching device.