t is suitable for small factories and the whole factory, large and medium-sized industrial and mining enterprise workshops, departmental power supply, and can be widely used in industrial and mining enterprises, oil fields, railways, construction sites, schools, hospitals, hotels, scientific research and other departments for precision machine tools, precision instruments, test devices, The voltage stabilization of elevators, imported electromechanical equipment and production line equipment is also suitable for users at the end of low-voltage power grids with low power supply voltage and large fluctuations.