A plug system with a plug connector, such as a high-current plug, and a mating plug connector, such as a high-current socket, for coupling to the plug connector by a lock device which counteracts a withdrawal of the plug connector from the mating plug connector in a locked position (I), wherein the lock device has a lever part which is secured to the plug connector in a pivotal manner and a securing clip which is attached to the lever part in an articulated manner for engaging into an engagement portion of the mating plug connector in the locked position (I).