Traditional automatic switching device lacks of flexibility in load-shedding. Adaptive automatic switching device is proposed to against the defect of traditional device. This paper introduces the principle of adaptive automatic switching device. Information interaction between the device and the substation integration automation system is discussed. The control processes of station equipment in the cases of normal state and fault state are studied. The proposed device intelligently shed less-important load according to real-time load situation. This approach can avoid fault expand brought by transformer overload after automatic switching device activated. It helps to improve power supply reliability and economy.