CIRCUIT BREAKERS
Electrical Distribution Systems
When the electrically-operated stored energy circuit breaker is tripped, the spring is recharged
by the spring charging motor so that the breaker is ready for the next closing operation. The
manually-operated circuit breaker closing springs are normally compressed by a hand crank just
prior to operation of the breaker. Figure 6 shows a large air circuit breaker which is classified
as a manually-operated stored energy circuit breaker. The closing springs are compressed by
pulling downward on the large operating handle on the front of the breaker. Closing this circuit
breaker is accomplished manually by depressing the small closing lever. Tripping this circuit
breaker is done by means of the tripping lever, located at the bottom front of the breaker.
Figure 6 Large Air Circuit Breaker
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