Convenient junction box.Allows multiple appliances to be plugged into a single outlet.
It protects your electrical system from overloads.Specifically, overloads created by using appliances such as microwave oven, a refrigerator and a coffee maker on the same outlet.
Protects the circuit.Reacts to the use of the microwave oven by disrupting the current to the other two appliances when the microwave is in use.