Distribution board

A distribution board is an electrical enclosure that divides incoming power among multiple circuits and provides protection and isolation for each circuit.

Busbar: A conductor that distributes electrical power to multiple connections. It carries incoming power across the board to circuit protective devices.
Electrical panel: An enclosure or assembly that houses electrical controls and protective devices. Distribution boards are a common type of electrical panel.
Consumer unit: A small distribution board used to control and protect circuits in a dwelling. It is the familiar residential form of a distribution board in the United Kingdom and similar systems.
Switchgear: Electrical equipment used to switch, control, protect, and isolate power systems. Distribution boards are simpler assemblies within the broader family of switchgear.
Circuit breaker: An automatically operated switch that interrupts current when a fault or overload occurs. Each outgoing circuit commonly has a breaker that disconnects it when unsafe current flows.
Electrical circuit: A connected path through which electric current can flow. The board's central task is dividing an installation into separately protected circuits.
Load center: A panelboard used to distribute power to branch circuits, especially in North American buildings. It performs the same branch-circuit distribution role under common North American terminology.
Main distribution frame: A telecommunications rack that connects and organizes incoming and outgoing signal cables. The similar name describes a communications cross-connect, not an electrical power board.
Residual-current device: A protective device that disconnects a circuit when current leaks from its intended path. It detects earth-leakage current and can protect several circuits supplied by the board.
Electrical feeder: A conductor or set of conductors that carries power from a source to downstream distribution equipment. It supplies the distribution board from an upstream source or panel.

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Earth-leakage circuit breakerRelated: Earth-leakage breakers are installed there to protect one or more downstream circuits.