What is a Distribution Box? A distribution box, or DB box, is a circuit breaker enclosure. It is a vital part and central hub of any electrical system. The hub distributes electrical power from a single input source to various circuits throughout a building. Available in types like Single Pole, Single Pole + Neutral, and Double Pole, they allow control over individual circuits for easy isolation and. Enclosure: This is the outer shell, usually made from plastic or metal, that protects the internal components and keeps users safe. Circuit Breakers or. Distribution boxes, often called breaker boxes or fuse boxes, are basically the central hub where electricity from your main supply gets divided into different circuits.