A rack module for low or medium voltage applications comprising a heat exchanger structure formed by a shaped body of thermally conductive material and having an elongated shape extending along main longitudinal axis, wherein said heat exchanger structure comprises: - a first heat exchanging portion adapted to provide a mechanical support for one or more power electronic components of said rack module and adapted to absorb and dissipate heat generated by said power electronic components, said first heat exchanging portion comprising a pair of spaced and adjacent first heat exchanging walls extending along directions parallel to a main longitudinal axis, each first heat exchanging wall having opposite first and second surfaces (211A, 211B) at opposite first and second main sides (2A, 2B) of said shaped body, each first heat exchanging wall being adapted to provide a mechanical support for said power electronic components and adapted to be in thermal contact with said power electronic components to absorb heat generated by said power electronic components at said first surface, each first heat exchanging wall comprising fins protruding from said second surface; - a second heat exchanging portion adapted to provide a mechanical support for one or more power electromagnetic components of said rack module and adapted to absorb and dissipate heat generated by said power electromagnetic components, said second heat exchanging portion comprising at least a second heat exchanging wall defining a recess extending along a direction parallel to a main longitudinal axis between said spaced and adjacent first heat exchanging walls, said recess accommodating said power electromagnetic components and at least partially segregating said power electromagnetic components with respect to said power electronic components and the surrounding environment, said recess having a blind bottom and being open towards a first main side of said shaped body; wherein said rack module further comprises an electronic module operatively associated to said heat exchanger structure and including said power electronic components, said electronic module including a housing having a base wall and an outer case fixed to said at least a first heat exchanging wall, the base wall of said housing covering at least partially the recess accommodating said power electromagnetic components and forming, in cooperation with said recess, a channel for the passage of a cooling fluid. - a first heat exchanging portion adapted to provide a mechanical support for one or more power electronic components of said rack module and adapted to absorb and dissipate heat generated by said power electronic components, said first heat exchanging portion comprising a pair of spaced and adjacent first heat exchanging walls extending along directions parallel to a main longitudinal axis, each first heat exchanging wall having opposite first and second surfaces (211A, 211B) at opposite first and second main sides (2A, 2B) of said shaped body, each first heat exchanging wall being adapted to provide a mechanical support for said power electronic components and adapted to be in thermal contact with said power electronic components to absorb heat generated by said power electronic components at said first surface, each first heat exchanging wall comprising fins protruding from said second surface; - a second heat exchanging portion adapted to provide a mechanical support for one or more power electromagnetic components of said rack module and adapted to absorb and dissipate heat generated by said power electromagnetic components, said second heat exchanging portion comprising at least a second heat exchanging wall defining a recess extending along a direction parallel to a main longitudinal axis between said spaced and adjacent first heat exchanging walls, said recess accommodating said power electromagnetic components and at least partially segregating said power electromagnetic components with respect to said power electronic components and the surrounding environment, said recess having a blind bottom and being open towards a first main side of said shaped body;