## circuit breaker:
A circuit breaker is an automatically operated
electrical switch designed to protect an electrical circuit from damage
caused by overload or short circuit. Its basic function is to detect a
fault condition and interrupt current
flow. Unlike a fuse, which operates once and then must be replaced, a
circuit breaker can be reset (either manually or automatically) to
resume normal operation. Circuit breakers are made in varying sizes,
from small devices that protect an individual household appliance up to
large switchgear designed to protect high-voltage circuits feeding an
entire city.
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