A surge protector or surge suppressor is an appliance or device designed to protect electrical devices from voltage spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or shorting to ground any unwanted voltages above a safe threshold. Surge protectors help you avoid damage from sudden power surges – One of the most important functions of a surge protector is in its name. These devices protect your equipment and your facility in the event of a power surge. Without a commercial surge protector, you're putting all your expensive devices at risk.