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There are a couple of different "classes" of products here....
The progressive industries unit is much more than a surge suppressor.
It monitors and protects against lots of things
a surge - which is a spike in voltage
a drop in voltage
reverse polarity
bad grounds
open neutrals
etc....
Some of these devices are only surge suppressors. Maybe that's what the Surge Guard is.
And just for point of discussion.... there is a third class of product. The buck/boost transformer, such as the Hughes Autoformer. This thing increases the voltage when it dips...something that the Progressive Industries product only detects and shuts off.
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