This surge protector is specifically designed for large appliances such as Air Conditioners, Freezers, Ice Makers, and Washing Machines. Its primary function is to safeguard your appliances from potential harm due to high or low voltage by interrupting the current flow. Once the voltage returns to a safe range, a safety cycle is initiated before the green light turns on, signifying the resumption of the current flow. With this surge protector, your appliances are protected not only from voltage spikes but also from blackouts.