The invention proposes an electrical plug-type connector for making contact with a mating plug-type connector, said plug-type connector having a displaceable locking and unlocking apparatus, which exerts a constant pressure on the apparatus by means of a double-sided torsion spring in such a way that the plug-type connector is forcibly locked when contact is made between said plug-type connector and the mating plug. In this case, the pressure exerted by the torsion spring legs is transferred to two axially displaceable sliding posts, which are again part of the unlocking apparatus. Furthermore, the unlocking apparatus has two sliding arms, which can be displaced in a tongue-and-groove guide, at least in regions, within corresponding recesses and flush with respect to the side faces of the plug-type connector housing.