Delta LA 603 AC Lightning Arrestor For 250 Volt 3 Phase 3 or 4 Wire Service Lightning arrestor for AC current devices. Protects your solar and wind energy equipment from nearby lightning strikes. For 250 Volt 3 Phase 3 or 4 Wire Service, with 36" leads. 600 Series Specifications Type of Design Metal Oxide VaristorTM Maximum current 20,000 amps Maximum energy 1,300 joules per pole Line Voltage 277/480 Volts Three Phase Response time one milliamp test 5 nanoseconds Leads 36" #12 THHN Case material PVC Locknut and Washer Furnished