... lightning protection cases for over 20 years.Material:surge protective device, SPD, Box-type SPD, surge arrester 220V AC Imax ... of any specification for your original product.Function:surge protective device, SPD, Box-type SPD, surge arrester 220V AC Imax ... assembled with Power Working Indicator, Malfunction Indicator and thunder strike counter.Power SPD with tow ports can realize tow classes (grades ...