opposite to the insulation displacement contact 63 are press fitted into a printed circuit board 61 thereby contacting the latter for this purpose the contact pins 62 comprise one or two deformable press fit zones the printed circuit board 61 comprises a hall sensor 71 an integrated circuit 70 ic a ptc for the winding shield power components and connector pins 64 for the voltage supply the motor housing part 44 comprises a connector housing 65 in which the connector pins 64 are disposed electronic components with high heat losses are cooled by means of heat conducting foils 67 in the direction of the wet chamber 101 conductor paths which serve for the contacting of components to be cooled are dimensioned so as to provide the broadest possible conductor paths 66 on the printed circuit board 61 for easier dissipation of heat in order to achieve a particularly good utilization of the printed circuit board 61 and optimum heat dissipation the different conductor paths 66 are designed with varying widths depending on the amount of heat arising in the component connection to be contacted a longitudinal groove is molded in the form of a cooling channel in the shaft 51 between a base 117 of the containment shell 116 and the pump impeller 59 this cooling channel enforces a continuous circulation of the conveying medium even in the interior of the containment shell 116 the printed circuit board is disposed between a front side 45 of the motor housing 44 and.