An electrical device for supplying power to a number of power devices, comprising a fixed support and a number of contactor units, wherein: - the fixed support comprises input terminals, for receiving a polyphase power current, and a distribution circuit configured to distribute the power current to power lines each comprising several single-phase supply lines the fixed support comprising as many power lines as the electrical device comprises contactor blocks and each power line comprising as many supply lines as the power current comprises phases, each of the supply lines of a contactor unit being connected to a respective phase of the power current, the supply lines being accessible outside the fixed support via intermediate terminals, - each contactor unit comprises secondary lines, each connected to a respective supply line via a respective intermediate terminal, the contactor blocks being movable between an assembled position, in which each secondary line is electrically connected to its own primary line via an intermediate terminal and is accessible externally from the contactor unit via an output terminal, and a disassembled position, wherein each secondary line is not connected to a primary line, each contactor unit further comprising a switching device, which is switchable between an open position, in which all secondary lines of that contactor unit are open, and a closed position, in which all secondary lines of that contactor unit are closed and do not prevent the flow of current between the intermediate terminals and the output terminal block, characterized in that the electrical device further comprises a control unit, which is movable between an assembled position, in which the control unit cooperates mechanically and electrically with the rest of the electrical device, and a disassembled position, in which the control unit does not cooperate mechanically or electrically with the rest of the electrical device, that when the control unit is in the assembled position, each contactor unit is, on the one hand, held in the assembled position, an electronic control device of the control unit also being connected to the switching device of each of the contactor units, the electronic control device being configured to control the switching of each switching device independently of the other switching devices, that when the control unit is in the disassembled position, the switching device of each of the contactor units is in the open state, while each of the contactor units is movable between its assembled and disassembled positions independently of the other contactor units, and in that the electrical connection between the secondary lines and the power devices is provided via connectors (8, 82), each connector (8, 82) being disconnectable from the corresponding output terminal block(s) when the corresponding contactor unit(s) is (are) in the disassembled position. - the fixed support comprises input terminals, for receiving a polyphase power current, and a distribution circuit configured to distribute the power current to power lines each comprising several single-phase supply lines the fixed support comprising as many power lines as the electrical device comprises contactor blocks and each power line comprising as many supply lines as the power current comprises phases, each of the supply lines of a contactor unit being connected to a respective phase of the power current, the supply lines being accessible outside the fixed support via intermediate terminals, - each contactor unit comprises secondary lines, each connected to a respective supply line via a respective intermediate terminal, the contactor blocks being movable between an assembled position, in which each secondary line is electrically connected to its own primary line via an intermediate terminal and is accessible externally from the contactor unit via an output terminal, and a disassembled position, wherein each secondary line is not connected to a primary line, each contactor unit further comprising a switching device, which is switchable between an open position, in which all secondary lines of that contactor unit are open, and a closed position, in which all secondary lines of that contactor unit are closed and do not prevent the flow of current between the intermediate terminals and the output terminal block, characterized in that the electrical device further comprises a control unit, which is movable between an assembled position, in which the control unit cooperates mechanically and electrically with the rest of the electrical device, and a disassembled position, in which the control unit does not cooperate mechanically or electrically with the rest of the electrical device, that when the control unit is in the assembled position, each contactor unit is, on the one hand, held in the assembled position, an electronic control device of the control unit also being connected to the switching device of each of the contactor units, the electronic control device being configured to control the switching of each switching device independently of the other switching devices, that when the control unit is in the disassembled position, the switching device of each of the contactor units is in the open state, while each of the contactor units is movable between its assembled and disassembled positions independently of the other contactor units, and in that the electrical connection between the secondary lines and the power devices is provided via connectors (8, 82), each connector (8, 82) being disconnectable from the corresponding output terminal block(s) when the corresponding contactor unit(s) is (are) in the disassembled position.