A GSM-based circuit breaker is an automatically operated electrical switch designed to provide security to the lineman while repairing the electrical lines. When operated manually we see fatal electrical accidents to the lineman are increasing during the electric line repairing due to lack of communication and coordination between the maintenance staff and electric substation staff. In order to avoid such accidents, the circuit breaker can be designed such that only authorized person can operate it with the help of password. Here, there is also a provision for changing the password. The system is fully controlled by the ATMEGA. The password is stored in an EEPROM, interfaced to the microcontroller and the password can be changed any time unlike a fixed one burnt permanently on the microcontroller. By using GSM module operator also can enter the password while he is away from the workstation and keypad is used to enter the password when an operator is on the workstation. A relay is used to open or close circuit breaker, which is indicated by the lamp. Any wrong attempt to open the breaker an alert will be displayed on the mobile screen through the GSM and also display the status on the LCD display.