Avanti Overload Protector/ junction box does more than just allow multiple appliances to be plugged into a single outlet It also protects your electrical system from overload that may be created by using appliances such as Microwave Oven a Refrigerator and a Coffee Maker on the same outlet. It protects the circuit by reacting to the use of the Microwave Oven and disrupting the current to the other two appliances any time the Microwave Oven is in use.