Drive system comprising modules that each comprise a terminal, each terminal being electrically connected by means of a respective busbar (1, 20, 30, 31, 40, 50), each busbar (1, 20, 30, 31, 40, 50) comprising a first terminal region (4, 34, 44), a second terminal region and a connection region, which is arranged between the first and the second terminal region and electrically connects the first and the second terminal region, the first terminal region (4, 34, 44) having a first thickness, the second terminal region having a second thickness, the connection region having the second thickness, a first of the modules being a power supply module, a second of the modules being an intermediate module and a third of the modules being an inverter that feeds an electric motor, the intermediate module being - a capacitor module, - an active brake chopper, - an active filter module or - a block-like backfeed for backfeeding energy into a three-phase voltage system that supplies the power supply module, in particular when the voltage at the DC voltage-side terminal exceeds a threshold value, a first screw being guided through a first hole in the first terminal region (4, 34, 44) and being screwed into a threaded bore in the terminal element of the module configured as the inverter, a second screw being guided through a second hole and being screwed, by its threaded portion, into a threaded bore in the receiving element of the power supply module until the screw head of the screw presses the busbar onto the receiving element, thereby bringing about electrical contact, a further, third screw being guided through a third hole and being screwed into a receiving element of the intermediate module, characterised in that the first thickness is smaller than the second thickness, the busbars (1, 20, 30, 31, 40, 50) are each received in a respective groove in a respective receiving element of each module configured as an electrical device, the groove width of each groove corresponding to the maximum current that is intended for that particular electrical device, the groove width of the terminal element of the intermediate module being configured to be smaller than the groove width of the groove in the terminal element of the power supply module. comprising modules that each comprise a terminal, each terminal being electrically connected by means of a respective busbar (1, 20, 30, 31, 40, 50), each busbar (1, 20, 30, 31, 40, 50) comprising a first terminal region (4, 34, 44), a second terminal region and a connection region, which is arranged between the first and the second terminal region and electrically connects the first and the second terminal region, the first terminal region (4, 34, 44) having a first thickness, the second terminal region having a second thickness, the connection region having the second thickness, a first of the modules being a power supply module, a second of the modules being an intermediate module and a third of the modules being an inverter that feeds an electric motor, the intermediate module being - a capacitor module, - an active brake chopper, - an active filter module or - a block-like backfeed for backfeeding energy into a three-phase voltage system that supplies the power supply module, in particular when the voltage at the DC voltage-side terminal exceeds a threshold value, - a capacitor module, - an active brake chopper, - an active filter module or - a block-like backfeed for backfeeding energy into a three-phase voltage system that supplies the power supply module, in particular when the voltage at the DC voltage-side terminal exceeds a threshold value, a first screw being guided through a first hole in the first terminal region (4, 34, 44) and being screwed into a threaded bore in the terminal element of the module configured as the inverter, a second screw being guided through a second hole and being screwed, by its threaded portion, into a threaded bore in the receiving element of the power supply module until the screw head of the screw presses the busbar onto the receiving element, thereby bringing about electrical contact, a further, third screw being guided through a third hole and being screwed into a receiving element of the intermediate module, characterised in that the first thickness is smaller than the second thickness, the busbars (1, 20, 30, 31, 40, 50) are each received in a respective groove in a respective receiving element of each module configured as an electrical device, the groove width of each groove corresponding to the maximum current that is intended for that particular electrical device, the groove width of the terminal element of the intermediate module being configured to be smaller than the groove width of the groove in the terminal element of the power supply module.