Patent ID: 7528334

Claim:
Circuit breaker-contactor including: one or two fixed contacts; a contact movable relative to the fixed contacts between an open position and a closed position; a means for displacing the movable contact into the closed position; a means for displacing the movable contact into the open position; a means for locking the movable contact into the closed position. a piezoelectric actuator deforming from a rest position to an operating position in order to displace the locking means so that the movable contact can be displaced into the open position by the means for openable displacement; and an electronic power supply and control unit supplying power to and controlling the deformation of the piezoelectric actuator into the operating position in response to an electrical amperage detected in the fixed contact or contacts wherein the locking means is a lever pivoting around a fixed axis, provided with a catch to lock the movable contact by absorbing a potential energy stored by the means for openable displacement and connected to the piezoelectric actuator by an attachment point so as to be pivotably controlled by the piezoelectric actuator in order to displace the catch until the movable contact is unlocked by releasing the potential energy stored by the means for openable displacement.