On the DC side, over voltage protection is required for the inverters which can be ensured by using 5SD74836RC. On the AC side, the over voltage protection can be ensured using surge arresters Type 2 (5SD7461-0RC/5SD7464-0RC), Module Width 3
Surge arrester Type 2 requirement class C, UC:350V/260V (L-N/N-PE) Pluggable protective modules 4-pole, 3+1 circuit for TN-S and TT AC systems, Rated Discharge Surge Current In=20kA , SC capacity with backup fuse=25kA.
Due to the combination of three power varistors, the overvoltage protection required for the inverters is implemented on the DC side. On the AC side, the overvoltage protection can be ensured using surge arresters type 2 (5SD7422-/5SD7424-)