Progressive Dynamics makes excellent products. BUT for Surge Protection I recommend Progressive Industries HW-30/50C (30 for 30 amp rigs 50 for 50)
If you have a good INVERTER generator you do not need surge guard on the generator side of life.. but you should have it when you are on shore power.
There are two kinds of "Surge protection"
The ATS with built in surge guard, at least evey one I've looked at offer only the first type ... Spike supression is what I call it. They clip high voltage "Spikes"
The HW-50/30c do that as well but they do more
1: When power is applied they hold off for a couple minutes (time optional on the PI-HW's or at least it was last I checked but set to LONG delay please) This means if power BLINKS (goes off and back on) air conditioners have time to bleed down so they restart normally not with a full head of pressure (Very hard on the compressor)
They also monitor for low voltage (also hard on compressors) and over voltage.
We often read of the poor sod who pluged into a 30 amp 240 volt outlet here in the forums.. if he'd had an HW-30 (or 50 with dogbone adapter) he'd not be so poor as the display would say "240 volts do not bypass".
