A multi-pole plug connection unit for three-phase alternating current systems having two plug connection parts which complement one another for the purpose of kink-free plug connection and having a locking sleeve which axially secures the plug connection parts in relation to one another in the plug-connected state is known. Each plug connection part is constructed as a monolithic insulating body in which a plurality of electrical plug contacts are axially latched, and an outside diameter of the plug connection parts and the locking sleeve is less than 23 mm, and the plug connection unit is designed to transmit voltage and current intensity ranges of up to 630 volts/16 amperes. The multi-pole plug connection unit is used for energy and signal transmission in machine tools.