Does what it says on the tin. I use this as extra protection for my RV in a linear automatic transfer switch for my 1000 watt inverter. Works well. For example, when I turn on the TV and outlets that use almost nothing, he never flips the switch. Now when I plug in my old electric coffee pot it brews about 6 full cups before bursting. If you get it right it is temperature sensitive so within 10 minutes it will get hot from a coffee pot from too much heat, it will break the switch before the…