... 1. Over 20 years specialized in lightning protection 2. CE certificated Lightning Surge Arrestor Protector DK-220ACm Type A updated ... BoxMoist, Damp, Dusty or Corrosive EnvironmentEnvironment need Record the lightning Currents DischargingApplicable Power Supply System: TT, TN, ITCharacterWorking ... Alarm Connector Terminalother products you might need Lightning Surge Arrestor Protector DK-220ACm Type A