Which risk increases when a three-phase circuit breaker fails to fully open one phase during a fault condition?

💡 Explanation

When a circuit breaker fails to open one phase, motor single-phasing occurs because the motor winding experiences unbalanced voltages, leading to increased current in the other phases and overheating. Therefore motor single-phasing results, rather than transformer saturation, insulation breakdown or generator oscillation, which require different fault pathways.

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