S400HV-2
Type 2 surge arrester for power lines
Surge protection for power supplies ( SPD Class II , Type 2 ) , for 3 conductors systems ( L1 , N , PE ) and for TT / TN - S
S400LV-1
Type 3 surge protection for power equipment, 24 Vac/dc with 3 conductors (L, N, PE)
Surge protection for single-phase, TN-S / TT ( SPD Class III , Type 3 ).