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By certification 
Double power source automatic switch is applicable for the three-phase four-wire power supply system of AC 50Hz, rated voltage AC 660V and below,
DC 440V and below,rated current up to 1600A,
it can realize automatic and manual changeover between normal and backup power supply power,and stop power supplying to load when changeover process of power supply is carried out.
the switch is applicable for two circuits power supply and in the condition which requires high quality power supply.
this products is in confirmity with standard GB 140408.3 GB140408.11(IEC60947-3,IEC60947-6)
