When power gets suddenly high or under-voltage, it will most likely damage any refrigerator's compressor. With this fridge guard, you can protect your appliance as it disconnects the power when it goes below or over unacceptable levels.When power gets suddenly high or under-voltage, it will most likely damage any refrigerator's compressor. With this fridge guard, you can protect your appliance as it disconnects the power when it goes below or over unacceptable levels.When power gets suddenly high or under-voltage, it will most likely damage any refrigerator's compressor. With this fridge guard, you can protect your appliance as it disconnects the power when it goes below or over unacceptable levels.When power gets suddenly high or under-voltage, it will most likely damage any refrigerator's compressor. With this fridge guard, you can protect your appliance as it disconnects the power when it goes below or over unacceptable levels.