The application relates to a power module (10) including: pieces of electrical equipment (12), at least first (14) and second (16) electronic cards, and a cooling device (20), able to discharge the heat given off by the pieces of electrical equipment and electronic cards. The cooling devices include first (34) and second (36) surfaces thermally insulated from one another, the pieces of electrical equipment (12) being in thermal contact with the first surface and separated from the second surface. The first electronic card (14) is fastened to a piece of electrical equipment (12) and thermally connected to the second surface (36) of the cooling device by a heat sink (42). The second electronic card (16) is positioned close to the second surface (36), or in contact with the second surface.