Abstract: An automatic trip device, a network system using it and control method thereof is related to providing the prediction of a potential electrical accident, in which measuring data including a temperature and a current from each of temperature and current sensors is received, the measuring data is stored in a data memory, the measuring data and a setting data are compared with each another and analyzed, an indicating portion display the life spans of an appliance equipment and mechanism and a power line section accommodating the interrupter, a temperature resistance coefficient based on the temperature stored is calculated, the temperature resistance coefficient is compared with one previously stored for the warning, the power line is interrupted and a warning portion is controlled to generate a warning signal if the calculated temperature resistance coefficient is higher than the warning temperature resistance one, thereby interrupting an accidental high current, rapidly, to protect persons and installments in