Device for operating a blocking element

A device for operating a blocking element (1) of a steering pole (2) of a motor vehicle includes a cylindrical lock having a housing (3) and a cylindrical core (4) arranged in the housing and rotating around an axis (4.1), wherein the cylindrical core (4) may rotate to another position (I, II, III), e.g. an intermediate position or an end position staggered from a start position (O); a control element (10) mechanically coupled to the blocking element, when the cylindrical core is rotated around the first axis (4.1), the blocking element is brought between a blocking position and a deblocking position; a switch (40) for determining the operation state of the motor vehicle according to the position of the cylindrical core, after an engine of the motor vehicle is ignited in advance in the end position, the engine is activated in the intermediate position (II); and a re-start blocking device (20) acting to the cylindrical core so as to prevent the core to rotate to the end position again when the engine is activa