surge protector

noun
a small device to protect a computer, telephone, television set, or the like from damage by high-voltage electrical surges.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
surge protector  
A device, typically portable and containing its own electrical outlets, used to provide regulated electric power for other electric devices. Surge protectors get their power from standard household or industrial electrical sources and contain circuitry that prevents damaging or disruptive spikes or surges in the source voltage from reaching the devices plugged into them.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The surge protector panels shall be designed to allow for adequate space for a
  wire connection and surge protector replacement.
In addition, the surge protector shall have the capability of removing high
  energy surges and shall block high speed transients.
If you do not have one, buy a power surge protector and plug all power inputs
  off of it.
Use a surge protector for your computer and plug the protector directly into an
  outlet.
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