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Which risk increases substantially when thermal runaway compromises a three-phase motor's individual circuit protection?

A)Cascading breaker trip failure
B)Increased core saturation losses
C)Harmonic current amplification
D)Elevated common-mode voltage

💡 Explanation

A thermal runaway affects one phase, potentially disabling its circuit breaker. This causes remaining phases to carry the higher load, initiating cascading breaker trip failure because of exceeding current thresholds; therefore, full system shutdown occurs rather than phase rebalancing or limited component overheating.

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