The arcing contacts in a circuit breaker are made of______________?
Correct answer: A. copper tungsten alloy
- A. copper tungsten alloy
- B. porcelain
- C. electrolytic copper
- D. aluminium alloy
Explanation
Arcing contacts must withstand high temperature, erosion and repeated arcing, so copper-tungsten alloys are commonly used. Porcelain is an insulating material rather than a contact material.
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