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A spike arrester is a protective device used to safeguard electrical equipment from sudden voltage spikes or surges. These surges can occur due to lightning, power outages, or switching operations. A spike arrester works by detecting high-voltage spikes and diverting the excess energy safely to the ground, preventing it from reaching sensitive devices. It acts as a barrier, allowing only normal voltage to pass through. By installing a spike arrester, equipment like computers, appliances, and industrial machinery are protected from damage, ensuring reliable operation and longevity.