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TIME DELAY RATINGS
CIRCUIT BREAKER MAINTENANCE

Neets Module 03-Introduction to Circuit Protection, Control, and Measurement
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2-27 Figure 2-23.—Circuit breaker with an operating handle. Circuit breakers used for low power protection, such as 28-volt dc, 30 amperes, can be physically small. With low power use, arc extinguishers are not required, and so are not used in the construction of these circuit breakers. Figure 2-24 shows a low power circuit breaker of the push-button or push-pull type. This circuit breaker has a thermal trip element (the bimetallic disk) and is nontrip-free. The push button is the operating mechanism of this circuit breaker.






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