Quote Originally Posted by Gil_J View Post
Surge suppressors absorb high voltage low duration spikes. When they do, they generally destroy the MOVs, which are the energy absorbing components.

A surge protector can not guard against out of range voltages being passed through the device. In fact, surge protectors have no way of blocking power being passed through the device. They don't have a high current relay or contractor like devices that protect against high or low voltage.
Hummmm , So I take it that the progressive does guard against high or low voltages passing thru to the coach then. Is this correct ? And since We are on this subject. Have You looked into the Hughes Autoformers ? What are Your thoughts on them ?