HV Exit Exam • Set 3 Question 3 of 30

A low voltage protection circuit is used in electric motor starting equipment to:

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Direct Answer

Option D: Prevent motor from restarting automatically upon restoration of supply voltage

Under-voltage (low voltage) protection prevents unexpected automatic restarting of motors upon voltage restoration, which protects personnel from mechanical injury and the electrical network from excessive starting surges.

All Options

Trip circuit contactor when the motor over-speeds due to low voltage

Trip circuit contactor when the motor develops short circuit due to low voltage

Allow the motor to restart automatically on restoration of voltage without manual resetting

Prevent motor from restarting automatically upon restoration of supply voltage (Correct Answer)

Detailed Explanation & Context

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

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