Abstract: An extractable circuit breaker is equipped with an operating lever which can take at least three positions: an inoperative position, an opening control position in which operating lever operates in conjunction with an opening latch of the circuit breaker, and a closing control position in which it operates in conjunction with a closing latch of the circuit breaker. When the circuit breaker is in the plugged-in position, the operating lever is inoperative. When the circuit breaker leaves its plugged-in position, the operating lever operates in conjunction with a countergear lever supported by the fixed frame accommodating the circuit breaker and performs opening of the poles of the circuit breaker. When the circuit breaker passes beyond its plugged-out position in the extraction direction, the operating lever moves from its inoperative position to its opening control position and then to its closing control position, causing opening followed by closing of the poles.

Abstract: The locking device of a plug-in and disconnection mechanism for a circuit breaker comprising a kinematic transmission system driven by a removable crank comprises a main locking catch able to take a closed position in which it prevents the crank from being fitted and an open position in which it enables the crank to be fitted, at least one operating cam and lever mechanism designed to take information representative of one or more positions of the circuit breaker and to prevent passage of the mobile element of the main locking catch to its closed position when none of these positions is detected, and an operating mode selector. In the embodiment with one cam and lever mechanism, the selector enables the cam and lever mechanism to be activated or neutralized. In the embodiment with two cam and lever mechanisms, the selector enables one or the other of the two cam and lever mechanism to be selected.