Plug-in circuit breaker comprising an operating lever for opening and closing of poles

A circuit breaker comprising:

• at least one pair of contacts at least one of which is movable and can take with respect to the other a closed position and an open position;
• an opening device comprising an opening spring movable from a loaded stage to a released state and from the released state to the loaded state, said opening spring being associated to the movable contact in such a way that relaxation of the opening spring drives the movable contact to an open position and that movement of the movable contact to a closed position results in loading of the opening spring, and an opening latch movable between a latched position in which the opening latch prevents movement of the movable contact from the closed position to the open position and an unlatched position enabling this movement;
• a loading device comprising a closing spring movable from a loaded state to a released state, the closing spring being associated with the movable contact in such a way that relaxation of the closing spring drives the movable contact the closed position, and a closing latch for latching the closing spring in the loaded state, a movable control means accessible from the outside of the circuit breaker and movable from an inoperative position in which the movable control means does not interact either with the opening latch or with the closing latch, to a first opening control position and from the first opening control position to an unloading control position, wherein the movable control means unlatches the opening latch by moving from an inoperative position to a first opening control position, and unlatches the closing latch by moving from the first opening control position to an unloading control position.