Which risk increases when a three-phase AC motor circuit breaker is incorrectly sized below the motor's locked-rotor amps?

💡 Explanation

When a breaker is undersized relative to locked-rotor amps, nuisance tripping occurs because the high inrush current during motor start exceeds the breaker's instantaneous trip setting, causing it to trip unnecessarily. Therefore, nuisance tripping results, rather than motor damage or grid effects, prevented by properly sized breaker.

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