![]() ![]() High joule rating: A joule rating tells you about how much energy the surge protector can absorb before it fails, so higher is better. ![]() Lower is better when it comes to let-through voltage, the measure of how much extra voltage reaches your electronics. A surge-protection rating of 400 volts or better: Although we verified each model’s abilities in our own electrical testing, we required that they be rated by one of the major product-safety corporations, UL or ETL, to bring a surge down to (at most) 400 volts.At least eight AC outlets: We required at least eight AC outlets for the main and top-of-the-line contenders, and at least three for our light-duty pick.Otherwise, at minimum, we required each model to have an indicator light that signals when its surge-protection capabilities have worn out. Automatic shutoff: We preferred this feature because it ensures you’ll never leave your equipment unprotected. ![]()
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