HV Exit Exam • Set 4 Question 15 of 30

A Miniature Circuit Breaker (MCB) provides protection against:

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Direct Answer

Option C: Both overload and short circuit conditions

MCBs integrate thermal protection (bimetallic strip for inverse-time overload protection) and magnetic protection (electromagnetic solenoid for instantaneous short-circuit protection).

All Options

Short circuits only

Overload conditions only

Both overload and short circuit conditions (Correct Answer)

Earth leakage current only

Detailed Explanation & Context

MCBs integrate thermal protection (bimetallic strip for inverse-time overload protection) and magnetic protection (electromagnetic solenoid for instantaneous short-circuit protection).

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

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