It can effective absorb the high voltage and over-current generated by the surge and maintain the normal voltage and current to supply for the electronic equipment, and reduce the harm resulting from surges and extend the service life, due to the surge is a sporadic phenomenon, and it can flow through the power cord, in order to guard against the damage of surge, it is necessary to install surge suppressors for the electronic equipment. (PS: Many products have been designed surge suppression circuit)