Originally Posted by BarryD0706
The SSP units also allow the user to do open neutral and reverse polarity testing, but won't protect against one of these happening because some tech mis-wires something after you're already connected.
That's right, Barry. Although I bought the PT30C for the more complete protection, the SSP units provide protection during an actual power surge and they also have a built-in surge status indicator and a dual line polarity tester.
Here are the differences as of a few years ago...
RV Surge Protector Comparison