EKPBSR AFCI Combiner Box Advanced Arc Fault Circuit Interrupter for Photovoltaic Systems

AFCI (Arc Fault Circuit Interrupter) combiner box with arc fault detection on each string input for PV systems where arc fault protection is mandated by code or inverter warranty. Arc fault detection protects against series and parallel arcing in module wiring and connectors that would not trip standard overcurrent protection.

AFCI protection in the combiner is increasingly required in US NEC 2017 and later jurisdictions for residential and commercial PV installations. The 8-string configuration covers common residential and small commercial array sizes.

The EKPSBSR-8-1 integrates arc fault circuit interruption directly into the combiner box, continuously monitoring all 8 string inputs for the waveform signature of a sustained DC arc fault. When detected, the output circuit trips before arc temperatures can damage wiring insulation — eliminating the need for a separate downstream AFCI device per string circuit.