A circuit breaker is an electrical switch that protects circuits from two types of damage: damage due to overload, in which a greater than necessary supply of electricity travels through a circuit; and damage due to short circuit, in which an electrical current travels along a path of low electrical impedance. When breakers sense these conditions, they automatically disconnect the flow of electricity to a circuit. Fuses serve the same function. But, unlike breakers, they cannot be reset and must be replaced after interrupting a current.
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