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. This publication contains the following new or updated information. This essential piece of equipment serves as the nerve center of your electrical system, managing power flow. This ultimate guide explains what a distribution box does, its internal components, common types, real-world applications, and how to select the right DB Box for your project. We also highlight how reliable manufacturers like NUOMAK support stable, compliant, and cost-effective power distribution. What is the difference between a junction box, a distribution box and a terminal box ? Junction box - where wires are spliced together or where conduits meet (wires don't necessarily need to be spliced in it.