Device for controlling mechanism of electric protection apparatus e.g. circuit breaker, placed in case, has preventing unit for preventing access of control inputs, which are used to bring driving shaft in position corresponding to input

摘要

The device has an actuator for driving a driving shaft of movable contacts in a closed position of the contacts corresponding to a setting position on a line of an electric protection apparatus, and an open position of the contacts. Two control inputs (1, 2) of the driving shaft are used to carry out the opening of the contacts of the apparatus and carry out the closing of the contacts of the apparatus. A preventing unit prevents the access of the control inputs, which are used to bring the driving shaft in the position corresponding to an input.