Main Switch: This is the “master control” for the entire distribution box, allowing the entire system to be turned off or on. In an emergency, flipping this switch cuts power to all circuits immediately, ensuring that maintenance and troubleshooting can be done safely. The main parts are the Miniature Circuit Breaker (MCB), Residual Current Device (RCD), busbars, and the main switch. Safe habits and checking the box often help stop electrical accidents. Understanding its placement and function can make maintenance safer and. The main electrical panel, often called a breaker box or load center, is the physical hub where the home's electrical service is centralized and distributed. The enclosure is a metal box designed. In the United Kingdom, a distribution board designed for domestic installations is known as a consumer unit. Mark of conformity is a voluntary manufacturer process and implies periodic verifications of the Quality of the products by the third party laboratory.