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=== arc fault circuit breakers ===Electrical fires happen every day in the United States because of electrical shorts that produce intensely hot arcs. An arc fault circuit interrupter senses these arcs and stops them, making them smarter than traditional circuit breakers. Also known as a arc-fault interrupter, it will trip for line-to-neutral arcing whereas a standard circuit breaker will not.=== breaker ===An automatic switching device that disconnects power to a circuit when current or heat exceeds a certain level for a duration of time. It clips on to one or two live busbars in a panel box and passes electrical current through itself to the circuit wire attached to it. The three positions of a common breaker are: on, tripped (the middle position), and off.A piece of rigid metal within a panel or fusebox which distributes electricity to the various circuits. They're made up of thick strips of copper or aluminium that conduct electricity within a breaker box.