S series dual power automatic switch is suitable for two power supply switching systems with rated AC voltage AC400V, frequency 50HZ/60HZ and rated current 16A-2500A. The three working positions of the switch body perfectly solve the practical problem of dual function when the substation, fire fighting system and other important power use places fail or circuit overhaul occurs. The shape design is more humanized, and each phase is separated by yellow, green, red and blue. It is not only beautiful and generous, but also convenient for site construction and maintenance. It is an ideal low-voltage ATS distribution product for substations, data centers, rail transit, hospitals, commercial complexes, etc.