A plug connector which has a main body, an actuator, a latch, and a block. The latch locks a receptacle of a counterpart plug connector by a push-pull mechanism. The latch can be released by actuation of the actuator. The block prevents the latch from moving into a locking position, in the unplugged state of the connector, i.e. without the seated receptacle. Thus, the connector can adopt two static states, an open state and a closed state.