The locking insertion mechanism (15) is equipped with thrust components, bumper components, the control lever (1) and with reversibly horizontally sliding mechanism of the locking slider (6) with a safety component for securing the control lever (1) in its secure closed position during the defined insertion of the plug-in component (10) into the guide frame (11) and the previously-defined axial connection of optical and/or electronic connectors (8) in connector casings (9) in their axes. The method for performing the plug-in connecting of the optical and/or electronic connectors (8) into the connector casings (9) is performed in three phases.