A Main Distribution Board is a component of an electrical distribution system that divides an electrical power feed into branch circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure. In essence, panel boards are used to protect against electrical overloads and short circuits while distributing electricity throughout a building or facility. The main components of a panel board typically include the enclosure, interior, circuit protection devices, labels, dead front and trim, and filler plates.