If the surge arrestor is out of service, it causes short circuit in the system. When surge arrestor separator is not used, this short circuit cause the activation of the circuit breaker and blackout of the energy of the system. Surge Arrestor separator prevents energy blackout by cutting grounding connection of the surge arrestor that is out of service. Activation of the surge arrestor separator, in other words cutting the grounding connection means that the Surge Arrestor has lost its function and must be replaced. Structure and Mode of Operation; When the surge arrestor loses its function, separator responds quickly to the current flow on it. Voltage decreases on the resistances of the separator and the capsule explodes by means of the arc occurring in the small opening inside of it and separates grounding connection of the surge arrestor.