Lightning Arrestor, Protection to Computers, Maclean Power Systems Recommends;The Entire Electrical Service and Protect Wiring, Major Appliances, Pumps, and Heating/Air Conditioning Equipment Application, Secondary Arrester Arrester Type, Made In Usa, 3 - Phases, 3 - Poles, 1 CT;10 PK Package Quantity, <5 NS Response Time, 650 V Voltage Rating, 21 Oz;653 G Weight