The switch in the distribution box, that is, the circuit breaker, is used to connect, break and carry the rated working current, short circuit, overload and other fault currents in the circuit, and can quickly break the circuit and provide reliable protection in case of. The switch in the distribution box, that is, the circuit breaker, is used to connect, break and carry the rated working current, short circuit, overload and other fault currents in the circuit, and can quickly break the circuit and provide reliable protection in case of. Principles for the Setup of Distribution Boxes and Switch Boxes The setup principles for distribution boxes and switch boxes refer to the requirements of "three-level control (power distribution) and two-level protection" as well as "one machine, one box, one switch, one leakage protector". The. Knowing the parts of a distribution board (db) helps you see how it handles electricity safely. A distribution board or distribution box is where the main power supply is distributed to multiple loads. And all the switching and protective devices are installed in the. After the power enters ip65 stainless steel enclosure from the main power source, it will pass through the main circuit breaker for primary control. This setup makes it easy to access and maintain, but the cables remain. 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.