Surge arresters are protective devices used in electrical power systems to prevent damage from voltage surges, often caused by lightning strikes or switching operations. They divert the surge to the ground, thereby protecting the insulation of the power system from the surge voltage. Different types include distribution class arresters, secondary or polymer arresters, underground arresters, tailored to specific application needs. They're crucial for enhancing the longevity of power system components and ensuring reliable, uninterrupted power supply.

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