Which risk sharply increases when a circuit breaker's interrupting rating is below the prospective fault current at installation?

💡 Explanation

When fault current exceeds the interrupting rating, the circuit breaker may fail to clear which causes an uncontrolled arc flash because the internal arc-quenching mechanisms are overwhelmed, potentially leading to component failure and a hazardous explosion. Therefore arc flash or explosion results, rather than other issues requiring different protective actions.

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