Which outcome occurs following sustained overload in power transformer circuit breaker protection?

💡 Explanation

When sustained transformer overload occurs, thermal expansion of conductors develops because increased current leads to I^2R heating beyond design limits within breaker components. Therefore, permanent device thermal damage often develops, rather than nuisance tripping which stems from waveform anomalies, or compensation malfunction, as the breakers’ primary function is interruption based on RMS current.

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