A surge suppressor (sometimes optimistically called a "surge protector") is a device inserted in the alternating current ( AC ) utility line  to prevent damage to electronic equipment from voltage "spikes" called transients. A more accurate term for this type of device is "transient suppressor." ,In Inductive Loads  to avoid Flyback Volteges AC Surge Suppressor  used in Embedded electronics to avoid malfunction and Resets.