1.SY-A 2.ISO9001 3.professional lightning protection 4.highly qualified research team 5.8 years experience ... power level explosion-proof box for lightning protectionSpecifications1.Digitalization anti-explosion, anti-dust 2.anti-water, anti ... condition, when the power grid line suffers the direct, indirect lightning stock or other instant overvoltage, in nanoseconds, the SPD can ...