On one occasion on a campsite in Spain the electricity had been off but when it came back on there was a power surge which caused a lot of damage to all the electric systems & anything plugged in to some vans. Obviously not an issue if you know about any work beforehand and can unplug from the source. But it had me thinking of if it occurred either when we were out or asleep. Is there a 'simple' ie preferably just plug it in gadget that would prevent the surge & any subsequent damage? Basically the simpler the better as my working knowledge of the van electrical system is basic. Thanks