Rated frequency 50Hz or 60Hz Rated secondary current 5A or 1A Rated short-time thermal current 40kA,1s Rated insulation level 12/42/75 kV Ambient temperature 25~40 Altitude Up to 1000m above sea level Indoor device Standards The product performance is in accordance with GB20840.1 GB20840.2 and IEC61869-1 IEC61869-2 standards.