HV Exit Exam • Set 4 Question 16 of 30

The arcing contacts in high-voltage circuit breakers are predominantly manufactured from:

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Direct Answer

Option A: Copper-tungsten alloy

Copper-tungsten (Cu-W) sintering combines the high electrical/thermal conductivity of copper with the extreme arc erosion resistance and high melting point of tungsten (3,422°C).

All Options

Copper-tungsten alloy (Correct Answer)

Porcelain ceramic

Pure aluminium

Phosphor bronze

Detailed Explanation & Context

Copper-tungsten (Cu-W) sintering combines the high electrical/thermal conductivity of copper with the extreme arc erosion resistance and high melting point of tungsten (3,422°C).

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

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