A control cabinet with housing, wherein the housing surrounds a plurality of modules in a housing-forming manner, wherein each module is centrally ventilated and has a heat sink, through which a cooling medium flows, with a continuous cavity which functions as a cooling duct, wherein the central ventilation means of each module, which is embodied as a cooling duct, opens into a collecting duct arranged within the housing, wherein the collecting duct leads to an air-conducting part, embodied as a deflecting part, of the housing, wherein the air-conducting part has an opening directed towards the surroundings, wherein feeding of the central ventilation means takes place from an inner region of the control cabinet which is surrounded by the housing, wherein the housing has a cutout through which the inner region can be fed with a cooling-medium stream, wherein a mounting plate is arranged within the housing between the inner region and collecting duct, wherein the inner region is delimited from the collecting duct by means of the mounting plate, wherein each module has a first air-conducting part and a further air-conducting part which is spaced apart from the first air-conducting part by means of the heat sink, wherein the first air-conducting part comprises a fan and the further air-conducting part serves to hold the heat sink on the mounting plate, wherein the further air-conducting part is arranged between the heat sink and the mounting plate, wherein the modules are connected in each case to the mounting plate and the respective module is held on the mounting plate by means of its air-conducting part, in particular wherein threaded bores are formed in the air-conducting part on that side which faces the mounting plate, so that the air-conducting part is screwed to the mounting plate by means of screws, wherein the mounting plate has a cutout for the cooling-medium stream to flow through which is associated with the respective module and passes through the mounting plate, wherein a heat-generating component is placed on a printed circuit board (23, 24, 25), wherein its electrical connection elements are connected by soldering to a printed conductor portion, wherein the printed circuit board (23, 24, 25) is connected to the heat sink by means of a holding device, the printed circuit board (23, 24, 25) is an assembly of printed circuit boards (23, 24, 25) which are connected by means of flexible regions, wherein the assembly at least partially surrounds the heat sink in the peripheral direction of the cooling duct. wherein the housing surrounds a plurality of modules in a housing-forming manner, wherein each module is centrally ventilated and has a heat sink, through which a cooling medium flows, with a continuous cavity which functions as a cooling duct, wherein the central ventilation means of each module, which is embodied as a cooling duct, opens into a collecting duct arranged within the housing, wherein the collecting duct leads to an air-conducting part, embodied as a deflecting part, of the housing, wherein the air-conducting part has an opening directed towards the surroundings, wherein feeding of the central ventilation means takes place from an inner region of the control cabinet which is surrounded by the housing, wherein the housing has a cutout through which the inner region can be fed with a cooling-medium stream, wherein a mounting plate is arranged within the housing between the inner region and collecting duct, wherein the inner region is delimited from the collecting duct by means of the mounting plate, wherein each module has a first air-conducting part and a further air-conducting part which is spaced apart from the first air-conducting part by means of the heat sink, wherein the first air-conducting part comprises a fan and the further air-conducting part serves to hold the heat sink on the mounting plate, wherein the further air-conducting part is arranged between the heat sink and the mounting plate, wherein the modules are connected in each case to the mounting plate and the respective module is held on the mounting plate by means of its air-conducting part, in particular wherein threaded bores are formed in the air-conducting part on that side which faces the mounting plate, so that the air-conducting part is screwed to the mounting plate by means of screws, wherein the mounting plate has a cutout for the cooling-medium stream to flow through which is associated with the respective module and passes through the mounting plate, wherein a heat-generating component is placed on a printed circuit board (23, 24, 25), wherein its electrical connection elements are connected by soldering to a printed conductor portion, wherein the printed circuit board (23, 24, 25) is connected to the heat sink by means of a holding device, the printed circuit board (23, 24, 25) is an assembly of printed circuit boards (23, 24, 25) which are connected by means of flexible regions, wherein the assembly at least partially surrounds the heat sink in the peripheral direction of the cooling duct.