The dual power automatic transfer switch (hereinafter referred to as the switch) is suitable for three-phase four wire power supply system with frequency of AC SOHz, rated operating voltage of 400V and rated operating current 16A-1600A. It can achieve automatic and manual switching between normally used power supply (N) and reserved power supply (R), and interrupt power supply to the load during the power switching process. It's suitable for occasions that require dual power supply and high power quality requirements. This series of products have communication port, which can achieve remote control and enable users to achieve unmanned substations.