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Arresters used in extra high voltage systems provide a basis on which the insulation level for system apparatuses is to be decided. When the 500 kV extra high voltage systems are compared with the 200 kV one, the former needs outstandingly larger outlay on its insulation, and it becomes necessary to bring down its insulation level for system apparatus by one rank. For protecting these apparatuses a high performance arrester whose discharge level (spark-over voltage, discharge voltage) is kept low should be used. Also, from the viewpoint of labor saving in maintenance care such as silicons compound coating work, etc., use of a contamination-proof type lightning arrester has been desired. This article introduces a new type of 420 kV lightning arrester which complies with these requirements successfully.