Abstract: An electric power supply device for an electric motor is disclosed. The device includes a housing including a pot base and a pot collar projecting at an angle from the pot base. An electrical connection unit is arranged in a housing interior that includes a busbar arrangement with at least three busbars for an electrical power supply. The connection unit includes an electrically insulating plug via which the busbars are electrically led out of the housing interior. The plug is arranged at least partially in a lead-through opening disposed on the pot collar and has a plug housing, in which the respective end portions of the busbars are arranged. The plug merges into a flange section that fixes the connection unit on the pot base.