Electrical Engineering · Switchgear and Protection
Consider the following symptom in a circuit breaker: 'contacts flash from one to the other, and the circuit breaker opens when underloaded when provided with an undervoltage coil, while none of the regular mechanical defects are apparent'. What is the most likely cause of this symptom?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1One arm not making contact
- 2Barriers are broken✓
- 3Single-phase operation
- 4Overheating
Correct answer
Barriers are broken
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