A distribution box has several important parts. Each part does something special: Main Switch: This switch controls all electricity coming into the box. Busbar: A metal strip spreads power to each circuit. 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. The distribution box (DB box) helps safely and efficiently distribute electrical power. Today, electrical systems are essential for homes and industries. 81 ft)]. A distribution board (also known as panelboard, circuit breaker panel, breaker panel, circuit breaker, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit. Made or assembled in Canada. Steel partition for 2-1/2 inches deep gangable boxes.