Solar arc out boxes" refers to a specific product, commonly known as an 

ArcBox, which is an enclosure designed to mitigate fire risks from electrical arcing in solar PV DC connectors. 

Primary Benefit: Fire Safety

The main benefit of a solar ArcBox is to dramatically increase the fire safety of a solar installation. In the event that an electrical arc fault occurs within the DC connector (due to issues like poor crimping, moisture ingress, or cross-mating different connector brands), the high-temperature ceramic material of the ArcBox is designed to contain the arc and prevent the spread of fire to surrounding combustible materials like roof battens or membranes. 

Other Key Benefits

For more information, you can visit the manufacturer's official information pages, such as the ArcBox websiteor through suppliers like