Arresters are devices made to protect electrical equipment from over-voltage transients caused by external or internal events. 15kV arresters are some of the most common, there is also 35kv arresters, and 25kV arresters which is less common. This class of device is used to protect equipment in power transmission and distribution systems. To protect a unit of equipment from transients occurring on an attached conductor, an arrester is connected to the conductor just before it enters the equipment. Arresters are not generally designed to protect against a direct lightning strike to a conductor, but rather against electrical transients resulting from lightning strikes occurring in the vicinity of the conductor. Transients similar to lightning-induced, such as from a high voltage system’s fault switching, may also be safely diverted to the ground; however, continuous over-currents are not protected against by these devices. Most applications install an arrester just before the conductor lands in each piece of equipment to be protected. Theses arresters are part of the cable accessories group.
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