Which of the following statements about arresters is true?

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The statement that arresters contain semiconductor blocks or discs that allow large currents to pass harmlessly to ground is accurate. The primary function of an arrester is to protect electrical equipment from voltage spikes and surges, such as those caused by lightning strikes or switching actions. When a voltage surge occurs, the arrester activates, conducting the excessive current to the ground, which prevents damage to sensitive equipment by diverting the energy away from the circuit.

The technology typically involves materials that become conductive at high voltages, helping to regulate the voltage level within an electrical system. This capability is crucial for maintaining system stability and ensuring that protective measures are in place against transient overvoltages.

In contrast to this, other statements do not accurately reflect the role or functionality of arresters. For instance, stating that arresters prevent all currents is incorrect, as they are designed to allow normal operational currents to pass and only activate under surge conditions. The assertion that arresters are only used in high voltage lines is misleading, as they can also be found in medium and low voltage systems. Lastly, the claim that arresters are not related to grounding systems overlooks the fact that their primary purpose involves grounding excessive current to protect infrastructure, clearly establishing a connection between arresters and grounding

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