Fridge Guard is a voltage protection device that safeguards refrigerators, freezers, and other appliances from damage caused by unstable power supplies, specifically low voltage (under-voltage) and high voltage (over-voltage) fluctuations and surges. It functions by automatically disconnecting the power when voltage levels become unsafe and then reconnecting it after a set delay once the power stabilizes, protecting the appliance's compressor and electronics from electrical malfunctions and extending its lifespan.