... wave and vibration1.2.5 No explosion and dangerous medium, the medium content of gas and dust can not beyond ... continuous working voltage (V~)combined method(see sheet 2)Maxi discharge current Imax(kA)design No.surge protective device2.2 ... working voltage Uc 65,180V-,150,300,345,385 V~·Test by classified II ·Protection level UP 0.5 ... ,10 ,20 ,30,40, 50, 60,70 kA BY6 series Surge Protective Devices