HV Exit Exam • Set 6 Question 27 of 30

If an electrically operated circuit breaker fails to open upon receiving an electrical trip command, possible causes include:

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Direct Answer

Option D: Any of the above

Failure to trip can result from electrical faults (blown DC control fuse, open trip coil, faulty auxiliary switch) or mechanical faults (stuck latch, broken trip spring).

All Options

Defective or discharged trip spring mechanism

Open circuit in the 110V/24V DC trip coil circuit

Mechanical binding or jammed trip latch

Any of the above (Correct Answer)

Detailed Explanation & Context

Failure to trip can result from electrical faults (blown DC control fuse, open trip coil, faulty auxiliary switch) or mechanical faults (stuck latch, broken trip spring).

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

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