... 20-5000A , 2P,3P or 4P 3.ATS Switch Electromagnetism drive type ATS switch(ATS) adopts twenty century advanced technology,with relible ... It provides reliability,easy operation,fast switch features.And it can be utilized in double power supply infrequence switching -- insulated ... .It can be widly used in the places, needed double power continuedly, such as emporium, telecom, fire protection, military, ...