SPD Combined Type 1 + 2 - Single Phase 3 Wire Systems Type 1+2 (Spark gap + varistor) For single phase 3 wire systems DIN rail mounting, 4 modules wide Impulse discharge current (10/350) -Ás; L-N 25kA, L-PE 25kA, N-PE 100kA Imax (8/20) -Ás; L-N 50kA, L-PE 50kA, N-PE 100kA