Protective spark-gaps

RU-69 Spark voltage, kV 2,0-4,0 RU-68 Spark voltage, kV 2,5-25 RU-67 Spark voltage, kV 0,15-0,4 RU-66 Spark voltage, kV 5,0-20 RU-65 Spark voltage, kV 16-40 RU-62 RT-57 Spark voltage, kV 1,8-30 RT-53 Spark voltage, kV 0,6-1,6 RT-39 Spark voltage, kV 45-75 RO-70 Spark voltage, kV 450-540 RO-69 Spark voltage, kV 350-450 RB-5 Spark voltage, kV 0,34-0,46 RB-3 Spark voltage, kV 0,22-0,265 RB-2 Spark voltage, kV 0,22 R-9 Spark voltage, kV 0,9-1,1 R-85 Spark voltage, kV 9,0-11,0 R-81 Spark voltage, kV 0,23-0,3 R-80 Spark voltage, kV 1,4-1,7 R-8 Spark voltage, kV 0,45-0,55 R-79 Spark voltage, kV 0,9-1,2 R-77 Spark voltage, kV 0,15-0,35 R-76 Spark voltage, kV 2,2-2,8 R-75 Spark voltage, kV 0,7-1,2 R-74 Spark voltage, kV 0,18-0,3 R-71 Spark voltage, kV 0,18-0,28 R-7 Spark voltage, kV 0,27-0,33 R-64 Spark voltage, kV 0,6-0,9 R-63 Spark voltage, kV 0,2-0,3 R-61 Spark voltage, kV 3,5-5,0 R-60 Spark voltage, kV 2,0-3,3