A Distribution Box, commonly known as a DB Box, serves as the central point for safely distributing electrical power from a main supply to multiple downstream circuits. It houses protective devices such as circuit breakers or fuses, ensuring both equipment protection and user. What is a Distribution Box? A distribution box, or DB box, is a circuit breaker enclosure. It supports different cable sizes and types, enabling smooth and fast power distribution. Whether you're powering up a residential home, a commercial office, or an industrial plant.