It can also be called a "GFI." That stands for Ground Fault Interruptor. I actually never thought of it but it is a good idea to make sure that the outlets my tanks are plugged into are set on one. Current building codes in most places require GFIs anywhere near a water source so most kitchens and baths have them. Some states require bedrooms to have them as well. They are cheap and not too hard to install.
A standard power strip should serve the same function. They have a circuit that will trip if overloaded as well.
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