... are widely used at the field of important power supply site,which transport,distribution power supply system and automatizaion system. For Fire ... Protection, Ho-spital, Bank, Building etc., which doesn't allowed power off.2.StandardInternational standardIEC60947-1(1998)IEC60947-3(1999)IEC60947 ... .85.85.85.85.85.866 QGLD1 series automatic transfer switch (ATS)--100A