Which risk is heightened when installing incorrectly sized circuit breakers on a three-phase motor circuit?

💡 Explanation

When undersized breakers are incorrectly installed, sustained overcurrent can occur because the breaker's thermal trip mechanism is delayed beyond the winding's thermal capacity, leading to insulation breakdown. Therefore, insulation breakdown results, rather than nuisance tripping, grid distortion, or EMI, which are associated with different electrical phenomena.

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