Figure 8 Simple Circuit Breaker Control Circuit Breaker Closed

Figure 7 Simple Circuit Breaker Control Circuit Breaker Open

Electrical Science Volume 4 of 4
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Electrical Distribution Systems CIRCUIT BREAKERS When the latching mechanism is released, the circuit breaker will open, opening the "a" contact for the tripping coil and de-energizing the tripping coil. Also, when the circuit breaker opens, the "b" contact will close, thereby setting up the circuit breaker to be remotely closed using the closing relay, when desired. The circuit breaker control switch may now be released. Figure 8 Simple Circuit Breaker Control Circuit - Breaker Closed As you can see from Figure 7 or 8, the circuit breaker control circuit can be designed so that any one of a number of protective features may be incorporated. The three most commonly-used automatic trip features for a circuit breaker are overcurrent (as discussed previously), underfrequency, and undervoltage. If any one of the conditions exists while the circuit breaker is closed, it will close its associated contact and energize the tripping coil, which, in turn, will trip the circuit breaker. Rev. 0 Page 13 ES-15

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