Emf surge Protectors are effective protection against transient AC line voltage spikes that can damage electronic equipment or interfere with their operation. These spikes are shunted through protecting MOVs where they are dissipated. All models feature full 3-mode surge protection: hot to neutral, hot to ground, and neutral to ground. All EMF surge Protectors are controlled by an illuminated power switch and protected against overloads by a Resettable circuit breaker.