A plug connector part for connecting to an associated mating plug connector part includes a housing. A plug-in portion is arranged on the housing and can be plugged into the associated mating plug connector part in a plugging direction to engage with the mating plug connector part when in a connection position. At least one electrical contact element is arranged on the plug-in portion. The at least one electrical contact element is for making electrical contact with the mating plug connector part. A locking element is movably arranged on the housing. The locking element has a locking position for locking the plug connector part with respect to the mating plug connector part when in the connected position. The locking element can be moved out of the locking position to unlock the connection between the plug connector part and the mating plug connector part.