... 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 standardIEC60947-6-1 National standardGB/T14048.113 ... (A): 10A 16A 20A 25A 32A 40A 63A QTQ1 series double power auto transfer switch