Converter comprising - at least one magnetic field concentration device (30, 30a, 30b) comprising two C-shaped magnetic field concentration elements (2, 3) which have in each case two legs (4, 5) and one web connecting the legs (4, 5) and are in each case received in a moulded part (1, 1a), wherein a respective moulded part has - a cavity with a web receptacle space which is configured to receive the web, a first leg receptacle space and a second leg receptacle space which are in each case configured to receive a leg (4, 5), - a first positioning element by way of which the other moulded part is able to be positioned so as to be mirror symmetrical in relation to the moulded part, - a second positioning element which is disposed externally on a shell face of the moulded part that delimits the cavity, and the moulded parts (1, 1a) by way of their first positioning elements (25, 25a, 26, 26a) are mutually disposed in such a manner that inner and/or frontal shell faces (19, 20, 21) of the moulded parts (1, 1a) at least partially enclose a conduit space, - at least one busbar (33, 33a, 33b) which is led through the conduit space, - at least one magnetic field sensor (34, 34a, 34b) which is disposed between free ends of a leg of a respective magnetic field concentration element (2, 3) of a magnetic field concentration device (30, 30a, 30b), and - a circuit board which is connected in an electrically conducting manner to the at least one magnetic field sensor (34, 34a, 34b) and has a positioning element by way of which the second positioning element (29, 29a) of a respective moulded part (1, 1a) is able to be disposed on the circuit board. - at least one magnetic field concentration device (30, 30a, 30b) comprising two C-shaped magnetic field concentration elements (2, 3) which have in each case two legs (4, 5) and one web connecting the legs (4, 5) and are in each case received in a moulded part (1, 1a), wherein a respective moulded part has - a cavity with a web receptacle space which is configured to receive the web, a first leg receptacle space and a second leg receptacle space which are in each case configured to receive a leg (4, 5), - a first positioning element by way of which the other moulded part is able to be positioned so as to be mirror symmetrical in relation to the moulded part, - a second positioning element which is disposed externally on a shell face of the moulded part that delimits the cavity, and the moulded parts (1, 1a) by way of their first positioning elements (25, 25a, 26, 26a) are mutually disposed in such a manner that inner and/or frontal shell faces (19, 20, 21) of the moulded parts (1, 1a) at least partially enclose a conduit space, - a cavity with a web receptacle space which is configured to receive the web, a first leg receptacle space and a second leg receptacle space which are in each case configured to receive a leg (4, 5), - a first positioning element by way of which the other moulded part is able to be positioned so as to be mirror symmetrical in relation to the moulded part, - a second positioning element which is disposed externally on a shell face of the moulded part that delimits the cavity, and the moulded parts (1, 1a) by way of their first positioning elements (25, 25a, 26, 26a) are mutually disposed in such a manner that inner and/or frontal shell faces (19, 20, 21) of the moulded parts (1, 1a) at least partially enclose a conduit space, - at least one busbar (33, 33a, 33b) which is led through the conduit space, - at least one magnetic field sensor (34, 34a, 34b) which is disposed between free ends of a leg of a respective magnetic field concentration element (2, 3) of a magnetic field concentration device (30, 30a, 30b), and - a circuit board which is connected in an electrically conducting manner to the at least one magnetic field sensor (34, 34a, 34b) and has a positioning element by way of which the second positioning element (29, 29a) of a respective moulded part (1, 1a) is able to be disposed on the circuit board.