Auxiliary device for electric circuit breaker, electrical system comprising a circuit breaker and such an auxiliary device and method to determine the ground of the circuit breaker opening with such an auxiliary device

摘要

The auxiliary apparatus according to the invention may be coupled to an electric circuit breaker. In the open position, the breaker is able to interrupt the circulation of a current in an electrical connection, the connection including at least one electrical conductor, and it includes a mechanical output member movable between an operating position and a stop position associated with the interruption of the circulation of the current in said connection after opening of the breaker. The auxiliary apparatus includes at least one current sensor, each current sensor being able to measure the current circulating in a respective conductor, and a mechanical coupling means for mechanical coupling with the mechanical output member, the mechanical coupling means forming means for detecting the opening of the breaker. The auxiliary apparatus further comprises a device for determining a cause of the detected opening, based on the intensity measured by each current sensor.