A control apparatus for the automated control of a technical installation, comprising a number of modules which are arranged next to one another in a longitudinal direction, wherein the modules each comprise at least one module part, said module part being a second module part, and wherein at least one module comprises said second module part and furthermore a first module part and a third module part, wherein the first module part and the second module part can be mechanically and electrically combined to form a first combined arrangement, wherein the first module part and the third module part can also be combined mechanically and electrically to form a second combined arrangement, wherein the third module part comprises at least one first electrical contact and the first module part comprises at least one corresponding first electrical mating contact, which, in the second combined arrangement, makes contact with the first electrical contact of the third module part for electrical connection between the first module part and the third module part, wherein the first module part comprises at least one further electrical contact, and wherein the second module part comprises at least one further electrical mating contact, which, in the first combined arrangement, makes contact with the further electrical contact for the electrical connection between the first and second module parts (102, 104), wherein the second module part further comprises a housing with at least one first electrical bus connector on a first side of the housing for electrical connection to a first neighboring module part which is adjacent in the longitudinal direction, and wherein the second module part furthermore comprises at least one second electrical bus connector on a second side, opposite the first side, of the housing for electrical connection to a second neighboring module part which is adjacent in the longitudinal direction, wherein the first bus connector and the second bus connector each are bus connectors of a supply voltage bus, which connects a supply voltage, characterized in that the third module part furthermore comprises at least one external connector for supplying a voltage from the outside, wherein the second module part comprises at least one movable part, which is movable into a first position and a second position, wherein the movable part, in the first position, provides an electrical connection between the first bus connector and the second bus connector and, in the second position, provides an insulation point between the first bus connector and the second bus connector, wherein the second module part has a first contact point, which is electrically connected to the first bus connector, and a second contact point, which is electrically connected to the second bus connector, wherein the insulation point is located between the first contact point and the second contact point when the movable part is in the second position, wherein the further electrical mating contact is one of the contact points (156, 158), with the result that, in the first combined arrangement, the further electrical contact makes contact with one contact point (156, 158) of the second module part for the electrical connection between the first and second module parts (102, 104) when the movable part is in the second position in order to provide a feed connection, wherein the first module part has its further electrical contact arranged in such a way that, in the first combined arrangement, the further electrical contact together with the feed connection provides an electrical connection between the first and second module parts (102, 104) in order to feed a voltage from the first module part to the second module part.