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In marine electrical systems, "surge" refers to a sudden increase in voltage or current that can potentially damage equipment or cause electrical arcing. Surges can be caused by a variety of factors, including lightning strikes, power surges from the shore or other vessels, switching operations, and faults in the electrical system. Surge protection devices, such as surge arresters and surge suppressors, are commonly used in marine electrical systems to prevent damage from surges. These devices work by diverting excess voltage or current away from sensitive equipment and dissipating it harmlessly.
 

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