What effect could be caused by an electrical arc formed when passing through the isolator with an enabled drive?

Explanation

Correct answer: Damage to the pantograph (current collector).

Passing through a section insulator while drawing power causes an electric arc to form between the pantograph's contact strip and the overhead line. The very high temperature generated in this way can lead to the melting or damage of the contact strip and, consequently, the entire pantograph.

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