A surge protector acts as a conduit between your electrical equipment and a wall outlet. It will protect your electrical equipment from a surge in power such as a lightning strike by blocking or shorting to ground any excess voltage that could damage your electronics. These are usually in a strip and have multiple power outlets. Surge protectors are rated on clamping voltage, energy absorption/dissipation and response time.
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Clamping voltage will cause the surge protector to conduct the electricity to the ground line. The lower the clamping voltage the better. Usually clamping voltages above 400 volts are too high.
The energy absorption rating tells how much energy the surge protector can absorb before failing. The higher the rating, the better. It is measured in joules, so a good surge protector will have a rating of at least 600 joules while the best have ratings in the thousands.
Response time is the time it takes the protector to start working when a power surge occurs. A good surge protector will have a response time of no more than one nanosecond.
Warranty and Battery
Many high quality surge protectors offer a warranty for connected equipment that fails due to a surge and also have a battery inside them in case the power goes out you so have time to save any computer work. These may also be factors in choosing the best surge protector.
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