Modular electrical system

An electrical system comprising:

• modules each comprising a circuit board, one or more electrical components on the circuit board, and a cooling element in heat conductive relation with one or more of the electrical components, and
• a frame structure for mechanically supporting the modules successively in a first direction so that the circuit boards of the modules are substantially coplanar and the cooling elements of the modules are substantially in a same attitude and mutually successive in the first direction,
• wherein each of the cooling elements comprises a heat transfer portion for transferring heat to cooling air, and the heat transfer portions are shaped so that, when the modules are mechanically supported by the frame structure so that the modules are successively in a first direction, the circuit boards of the modules are substantially coplanar, and the cooling elements of the modules are successively in the first direction, the heat transfer portions are arranged to conduct the cooling air in a second direction deviating from the first direction, and at least a part of a first flank of each of the heat transfer portions is oblique with respect to the first direction so that an acute angle between the at least part of the first flank and the second direction is smaller than an acute angle between the first and second directions.