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← TechnologyWhich risk increases when a three-phase induction motor feeder breaker is sized significantly oversized?
A)Locked rotor thermal damage✓
B)Voltage sag from transformer saturation
C)Harmonic resonance near rated speed
D)Eddy current losses breaker overheating
💡 Explanation
When a breaker is oversized, the inverse time characteristic shifts right, delaying tripping during locked rotor conditions became thermal damage occurs because current limits the motor cannot start fully. Therefore locked rotor damage increases, rather than sag, resonance or eddy flows from unrelated mechanisms.
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