Which outcome occurs when metal-oxide varistor (MOV) clamping circuit repeatedly absorbs high transient energy surges?

💡 Explanation

When a MOV repeatedly absorbs high transient energy, degradation occurs via localized heating and microstructural changes, leading to increased resistance and a higher let-through voltage because the varistor material loses its non ohmic properties. Therefore, a gradual increase in let-through voltage results, rather than decreased response time, open-circuit failure, or power reduction which are due to alternate causes.

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