Delta Lightning Arrestor Surge Arrestor, 300 Series, Commercial, 125 - 250 V, 50/60 HZ, Phase: 1 PH, Short Circuit Rating: 60000 AMP, Response Time: 5 NS At 1 MILAMP, 10 NS At 10000 AMP, 25 NS At 50000 AMP, Mounting: Bracket, Material: PVC Case, 2-1/4 IN Diameter X 2-1/4 IN Height, Leads: 18 IN 12 T