A problem addressed by embodiments of the invention disclosed herein consists in devising a connection device in which field terminations can be released also in the installed state, i.e., the electrical conductors can be manually disconnected using a simple tool even if the insulating body is already installed in an attachment housing. To this end, an actuator is proposed which has an inclined engagement portion with an adjoining engagement edge and engagement step by which the actuator can be lifted out of the insulating body, also from the cable connection side, with a slotted screwdriver in a single lifting movement.