Delta LA-303R, 3 Phase Lighting Arrestor Lightning Arrestor for 250 Volt 3 Phase 3 or 4 Wire Service 300 Series Specifications Type of Design Silicon Oxide VaristorTM Maximum current 100,000 amps Maximum energy 3,000 joules per pole Maximum number of surges Unlimited Response time one milliamp test 5 nanoseconds Response time to clamp 10,000 amps 10 nanoseconds Response time to clamp 50,000 amps 25 nanoseconds Leak current at double the rated voltage none Leads 36" #12 THHN Case material PVC Locknut and Washer Furnished