MCB Type Surge Protective Devices Code - BY2 Rated Volt.: AC 50/60 Hz,380V It protects the electric network caused by the thunder or over voltage . Pole: 1Pole, 2Pole,3Pole, 4Pole Maximum continuous operating voltage : Uc 75 150 275 320 385 440 660V~ Test grade:II Voltage protect level: Up< 350 550 1000 1250 1500 1750 2500V Maximum discharge current : (8/20uS) Imax 40kA Nominal discharge currrent: (8/20uS) In 10 15 20kA