A power surge is an unexpected, momentary spike in electrical voltage that exceeds the standard flow of electricity within a home or building. These surges can significantly damage or degrade the lifespan of electrical appliances and devices that are connected to the system. Power surges can vary in magnitude, with some having the potential to cause immediate and catastrophic damage to sensitive electronics and your electrical infrastructure.

A power surge can be caused by any number of factors, both internal and external to the home. External causes of power surges include lightning strikes, power outages, and fluctuations in the power grid, such as those caused by the switching of power lines or utility company malfunctions. Internally, surges can occur when large appliances, like air conditioners and refrigerators, turn on and off, drawing large amounts of electricity abruptly, which can disrupt the steady flow of voltage through the home's electrical system.