A locking arrangement for plug connectors, comprising a first locking device and a second locking device. The two locking devices can be plugged together and engaged with one another. At least one blocking element is provided for engaging the first locking device with the second locking device. The blocking element is suitable for mechanical engaging and can be actuated and released via an actuator. In addition, another actuator is arranged in the first locking device or in the second locking device to protect against failure of the locking arrangement. The engaging of the two locking devices can be released by the actuator, even when the actuator fails. The first locking device and the second locking device are provided for use in a plug and a corresponding counter plug.