Which outcome is likely if an incorrectly sized shunt trip breaker is installed in a three-phase motor circuit?

💡 Explanation

When a shunt trip breaker is undersized, nuisance tripping occurs because the inrush current during motor startup exceeds the breaker's operational threshold, causing it to trip prematurely. Therefore nuisance tripping during startup is the outcome, rather than delayed tripping, phase imbalance, or harmonic distortion which are attributed to different causes such as breaker failure or supply issues.

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