circuit breaker

circuit breaker
1. Elect. Also called breaker. a device for interrupting an electric circuit to prevent excessive current, as that caused by a short circuit, from damaging the apparatus in the circuit or from causing a fire.
2. any property-tax relief measure that reduces or limits property taxes for certain eligible taxpayers, as those with low income or the elderly.
[1870-75, Amer.]

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▪ electrical device
      automatic switch in an electric circuit. Its function is similar to that of a fuse—to open the circuit if abnormal current conditions occur, usually overloads—but it is not destroyed in operation and can be closed again. The simplest circuit breakers are operated by a solenoid that is activated by an excessive increase in current flow. Small circuit breakers are widely used in place of fuses to protect electrical systems in homes.

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Universalium. 2010.

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