An assembly of electronic components for a rotary electrical machine and power and signal interconnection pieces cooperating with the electronic components in order respectively to distribute power to the electronic components and convey control signals between electronic components for the functioning of the rotary electrical machine, wherein the electronic components are disposed in at least one module disposed on a first plane, the at least one module comprising a housing defined by a top face and a bottom face and at least three lateral faces, the signal interconnection piece is disposed on a second plane parallel to the first plane, and the power interconnection piece is disposed on a third plane parallel to the first plane, the power and signal interconnection pieces being independent of each other and independent of the at least one module.