DK series static transfer switch cabinet, also known as ATS cabinet, is a universal dual power automatic switching device. This product can input 2 independent AC380V 500kW power supply branches at the same time, which are main power supply and backup power supply. When the main power supply loop stops, the backup power supply branch circuit is automatically turned on within 30s to supply power to the load. The product adopts safe circuit design, and the operation is simple and safe, ensuring the normal operation of important loads such as emergency lighting, security power supply, and firefighting equipments.