Electrical device with a housing part, wherein first, second and third cooling fins (1, 2, 3) are moulded or formed on the housing part, wherein the housing part has a wall, in particular a top, and two side walls, wherein each of the cooling fins (1, 2, 3) extends along the wall and at least one of the side walls, wherein the first cooling fins extend in an arcuate manner, i.e. each have an arc along their extension on the surface of the housing part, in particular which arc ideally corresponds to a quarter-circle arc, the arc being arranged on the top of the housing part, wherein the third cooling fins extend in an arcuate manner, i.e. likewise have an arc along their extension on the surface of the housing part, in particular which arc ideally corresponds to a quarter-circle arc, the arc likewise being arranged on the top of the housing part but being inversely curved in comparison to the arc of the course of the first cooling fins, wherein the course of the second cooling fins has a double arc along the extension of the second cooling fins on the surface, in particular on the top, of the housing part, the first arc of the double arc extending in an inversely curved manner in comparison to the second arc of the double arc, wherein a respective thickened portion of the wall thickness of the housing part, which acts as a connecting strip on each of the side walls, connects two cooling fins (1, 2, 3) that are in each case next-adjacent to each other, characterized in that the wall thickness of the housing part in the region of a respective connecting strip is smaller than the wall thickness of the housing part in the respective region of the cooling fins (1, 2, 3) which adjoins the respective connecting strip, the wall thickness of the region of the first, second and third cooling fins (1, 2, 3) that extends on the wall has a wall thickness that decreases as the distance from the wall increases, and wherein the wall thickness of the region of the first, second and third cooling fins (1, 2, 3) that extends on the first side wall has a wall thickness that decreases as the distance from the first side wall increases, and wherein the wall thickness of the region of the first, second and third cooling fins (1, 2, 3) that extends on the second side wall has a wall thickness that decreases as the distance from the second side wall increases. wherein first, second and third cooling fins (1, 2, 3) are moulded or formed on the housing part, wherein the housing part has a wall, in particular a top, and two side walls, wherein each of the cooling fins (1, 2, 3) extends along the wall and at least one of the side walls, wherein the first cooling fins extend in an arcuate manner, i.e. each have an arc along their extension on the surface of the housing part, in particular which arc ideally corresponds to a quarter-circle arc, the arc being arranged on the top of the housing part, wherein the third cooling fins extend in an arcuate manner, i.e. likewise have an arc along their extension on the surface of the housing part, in particular which arc ideally corresponds to a quarter-circle arc, the arc likewise being arranged on the top of the housing part but being inversely curved in comparison to the arc of the course of the first cooling fins, wherein the course of the second cooling fins has a double arc along the extension of the second cooling fins on the surface, in particular on the top, of the housing part, the first arc of the double arc extending in an inversely curved manner in comparison to the second arc of the double arc, wherein a respective thickened portion of the wall thickness of the housing part, which acts as a connecting strip on each of the side walls, connects two cooling fins (1, 2, 3) that are in each case next-adjacent to each other, characterized in that the wall thickness of the housing part in the region of a respective connecting strip is smaller than the wall thickness of the housing part in the respective region of the cooling fins (1, 2, 3) which adjoins the respective connecting strip, the wall thickness of the region of the first, second and third cooling fins (1, 2, 3) that extends on the wall has a wall thickness that decreases as the distance from the wall increases, and wherein the wall thickness of the region of the first, second and third cooling fins (1, 2, 3) that extends on the first side wall has a wall thickness that decreases as the distance from the first side wall increases, and wherein the wall thickness of the region of the first, second and third cooling fins (1, 2, 3) that extends on the second side wall has a wall thickness that decreases as the distance from the second side wall increases.