Mechanism for automatic switch

The mechanism, which is provided especially for use in the case of line protection circuit breakers, can be clamped in a geometric lock in the form of a knee joint by means of a latch clip (2) which is articulated on a pivotably supported toggle (1) and is supported at its free end on a lever (3) which forms a latching point (4) and is supported such that it can rotate. In this case, on the side facing away from the latching point (4), the latching clip (2) has a rigid extension (2c) which passes beyond the articulation point (1b) of said latching clip (2) on the toggle (1), on which extension a spring (5), which engages from a fixing point (6) and is used as a force store for pivoting the toggle (1), is suspended at a point (hole 2f) which is predetermined in such a manner that, in the switched-on position with the mechanism latched, said point is located precisely or virtually on the connecting line (8) between the articulation point (1b or 2d) of the latching clip (2) on the toggle (1) and the fixing point (6) of the spring (5), and hence in its active direction on the articulation point (1b or 2d). When the mechanism is unlatched and in this case the direction of the latching clip (2) changes itself, a pivoting torque is simultaneously exerted by the spring (5) on the latching clip (2) in the direction of the latching point (4).