Which risk increases when a molded-case circuit breaker is applied in a three-phase system with high harmonic distortion?

💡 Explanation

When harmonic distortion is high, harmonic currents circulate which biases upwards, meaning the device approaches 100% rated trigger level sooner and nuisance tripping occurs disproportionately due to the peak current effect. Therefore nuisance tripping occurs, rather than contact welding, insulation breakdown or reduced capacity, all caused by other separate, non-distortion related failures.

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