Surge Arrester BKS A 10kA & BKS B 20kAProduct Rating BKS-ABKS-B Pole1, 2, 3, 4 Pole Rated system voltage, Un AC [V]220V 220/380V Maximum continuous operating voltage, Uc AC [V]320V 320V Voltage protection level, Up [kV] ≤ 1.0kV ≤ 1.2kV Maximum discharge current, Imax(8/20㎲)[kA, per mode] 10kA 20kA Response time, ns < 25 ns Usable ambient temperature, ℃ -40 ~ +80℃ Usable frequency, Hz 50/60Hz Attachment type DIN-rail attachment type Operation status indication window Normal operation : Green LED lighting, Abnormal / After an accident : Red lighting Min. terminal connection 1 Phase and Neutral 2.5, Earth 4 Protection class Class III Class IIAlarm Contact No No No No No Yes Yes