The main switch, or main breaker, controls the entire electrical supply to the distribution box. It's typically rated for the maximum current capacity of the electrical. A distribution box, also known as a distribution board, electrical panel, or breaker box, is an enclosure that houses electrical components responsible for distributing electricity throughout a building. Unlike. Isolation switches in distribution boxes ensure electrical safety by disconnecting circuits for maintenance, preventing shocks, aiding compliance, and improving system reliability. This switch allows for the isolation of power during maintenance or emergencies. Understanding its significance.