Solar PV Arc Fault Circuit Interruption Afci Combiner Box BHSZ-8/1 - 1500VThe Arc Fault Circuit Interruption Combiner Boxes monitor the current and voltage of each string and the temperature in an enclosure, the integrated automatic. contactors triggered when there is arc fault detected. So the PV DC strings will be shut down rapidly. The solution provides solar PV system safety. The DC contactors can be remote controlled for easier system maintain. 1000V AFCI Combiner Box: 8 Strings Input 1 String Output APPEARANCE