An electrical core comprising an assembly of power management and distribution contactors is provided. The power management contactors are attached to a first support element and the distribution contactors are carried by a second support element superimposed on the first so as to form a multilayer assembly. The distribution contactors are arranged in double symmetry about two axes perpendicular to one another. They are mechanically linked through a mechanical linkage element extending between two rows of contactors and which carries electrical connection elements connecting the contactors to an element for connecting to a power source. The contactors are assembled in modules according to their type. In particular, the management module comprises at least one modular element common to the power management contactors which is suitable for performing a given secondary function other than the function of establishing a contact.