Sorry - I need to clarify how I seem to have taken this thread off topic. The OP asked about surge protectors. One of my posts tries to explain that we often get trips in Mexico due to fluctuations. With some surge protectors this can mean having to wait up to 3 minutes for the power to come back on. Generally a surge protector will trip if voltage goes below 108 or above 132 as I recall. They also should protect against high spikes etc. So I brought up the Voltage Regulator as a way to try to keep voltage even and have less frequent trips due to high or low voltage. The ISB device will keep us in the "safe" range when we are in places where there can be regular fluctuations going high or low. Many RV parks have inadequate wiring so when your neighbors AC kicks on or they fire up the hair dryer the voltage for all could drop for a long enough period of time to trip a surge protector - and when a large appliances in an RV nearby is turned off we could get a brief surge of voltage high enough to trip a surge protector. The ISB can help - but is not guaranteed to eliminate all trips. And the ISB will not increase the amps you can draw from any pedestal. All the ISB device does is regulate voltage to a safe level. Using one can reduce the number of trips your surge protector might experience.