Electrical device (1; 1') for supplying electrical power to a plurality of power units, comprising: - a fixed support; - input terminals for receiving a polyphase electric current; - a first module comprising a first power line connected to the input terminals, the power line comprising an electrical circuit breaker; - a second, removable module comprising: • second power lines (40a, 40b, 40c, 40d) which are connected to the first power line by way of an electrical distribution circuit which is configured to distribute the polyphase electric current from the first power line to each of the second power lines; • a control circuit which is programmed to trigger the circuit breaker as a function of values of the electric current which is flowing through the second power lines; • a connection interface provided with output connectors connected to the second power lines; - removable elements (5a, 5b, 5c, 5d) each containing a piece of electrical equipment which is to be connected to an electrical power unit by way of output terminals of the removable element, each removable element (5a, 5b, 5c, 5d) being displaceable between an assembled position, in which it is connected to the connection interface, and a removed position, in which it is removed from the connection interface, the piece of electrical equipment being connected to one of the second power lines by way of the output connectors of the connection interface when the removable element (5a, 5b, 5c, 5d) is in the assembled position, the control circuit being connected to a control interface of the piece of electrical equipment of each removable element (5a, 5b, 5c, 5d) by way of a data link (45; 45') by virtue of the connection interface in order to send a control signal to the piece of electrical equipment. - a fixed support; - input terminals for receiving a polyphase electric current; - a first module comprising a first power line connected to the input terminals, the power line comprising an electrical circuit breaker; - a second, removable module comprising: • second power lines (40a, 40b, 40c, 40d) which are connected to the first power line by way of an electrical distribution circuit which is configured to distribute the polyphase electric current from the first power line to each of the second power lines; • a control circuit which is programmed to trigger the circuit breaker as a function of values of the electric current which is flowing through the second power lines; • a connection interface provided with output connectors connected to the second power lines; • second power lines (40a, 40b, 40c, 40d) which are connected to the first power line by way of an electrical distribution circuit which is configured to distribute the polyphase electric current from the first power line to each of the second power lines; • a control circuit which is programmed to trigger the circuit breaker as a function of values of the electric current which is flowing through the second power lines; • a connection interface provided with output connectors connected to the second power lines; - removable elements (5a, 5b, 5c, 5d) each containing a piece of electrical equipment which is to be connected to an electrical power unit by way of output terminals of the removable element,