The Sungrow 3PH Inverter with AFCI 33KW (SG33CX-V112) is a Multi-MPPT String Inverter for a 1000 Vdc System. The SG33CX-V112 has an Arc-Fault Circuit Interrupter (AFCI) + Surge Protection Device (SPD) type I and II. This inverter comes in three different performance classes. The integrated NS-protection and the patented external AC-connector make this inverter extremely easy to install and therefore unique in its class.