Metal cast aluminum distribution boxes, also known as aluminum electrical enclosures, are electrical junction boxes made from cast aluminum alloys. In 63 / 100 / 160 / 315 KVA distribution box, the cross se the Isolator with cross section as mentioned above throughout the length. Porcelain. Copper and aluminum busbars look similar, but their real-world performance in switchgear, load centers, and electrical distribution boards is completely different. Branch Circuit Breakers: Individual switches protecting specific circuits (like.