Marine Electrical Systems USCG Question #1256 (Set 42)

As shown in figures "E" and "F" of the pictured high voltage rack mounted circuit breaker, which figure represents the circuit breaker position when in the open or tripped position? Illustration EL-0167

USCG Exam Illustration EL-0167
USCG Examination Diagram: Illustration EL-0167
Official USCG Answer & Rule Citation

Correct Answer: Option C — C

In high-voltage rack-mounted circuit breaker diagrams, position C typically denotes the open or tripped state. This is visually confirmed by the physical separation of the primary contacts and the status of the mechanical linkage, which prevents current flow through the breaker to the downstream distribution bus or equipment.

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