Which risk increases when a three-phase circuit breaker employing minimum oil encounters frequent fault interruptions?

💡 Explanation

When the oil decomposes due to intense arcing from frequent fault interruptions, dielectric strength degrades because the oil's insulation properties diminishes due to carbonization. Therefore, dielectric oil breakdown results reducing overall dielectric withstanding capability, rather than other effects such as contact welding, mechanical fatigue or housing failure from significant pressure increase, assuming other failure parameters remaining constant.

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