Which failure occurs when a dielectric material within an AC film capacitor experiences voltage beyond its rated capacitance?

💡 Explanation

When a dielectric with rated capacitance faces overvoltage in an AC film capacitor, dielectric heating increases because the material's insulation weakens, causing increased current leakage and dissipation. Therefore thermal runaway results, rather than corrosion, inductance increase, or reduced resistance which require different electrochemical or mechanical processes.

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