Electromechanical power-assisted steering system, comprising a permanently excited three-phase electric motor, which can be operated by means of an electronic controller and supply lines (14+, 14-) from a vehicle DC electrical system of a motor vehicle, wherein the electric motor comprises at least three phase windings (u, v, w), which on the one hand are connected to one another at a star point of a star connection and on the other hand are connected to a driver circuit via lines (22, 23 and 24), wherein the driver circuit connects each of the lines (22, 23 and 24) respectively via a first MOSFET (20u, 20v, 20w) of a first group to the positive supply line (14+) and respectively via a second MOSFET (21 u, 21 v, 21w) of a second group to the negative supply line (14-), as a function of a controller, and wherein further MOSFETs (30u, 30v, 30w; 31 u, 31 v, 31 w) are provided as safety switches, characterised in that - the further MOSFETs (30u, 30v, 30w; 31 u, 31v, 31w) comprise in total six MOSFETs (30u, 30v, 30w; 31 u, 31 v, 31w) in a third group and a fourth group, wherein - respectively one MOSFET (20u, 20v, 20w) of the first group lies in series with one MOSFET (30u, 30v, 30w) of the third group, between the positive supply line (14+) and one of the lines (22, 23, 24) to the phase windings (u, v, w), - respectively one MOSFET (21 u, 21 v, 21w) of the second group lies in series with one MOSFET (31 u, 31 v, 31w) of the fourth group, between the negative supply line (14-) and one of the lines (22, 23, 24) to the phase windings (u, v, w), so that respectively two MOSFETs are arranged between each supply line (14+, 14-) and each of the lines (22, 23, 24) leading to the phase windings (u, v, w), and in that - respectively at least one MOSFET of the four MOSFETs connected to a line (22, 23, 24) is arranged with its parasitic diode in the forward-bias direction in relation to the vehicle DC electrical system, and wherein - at least one of the diodes in one of the groups of MOSFETs (20, 30, 21, 31 (is connected in the reverse-bias direction. - the further MOSFETs (30u, 30v, 30w; 31 u, 31v, 31w) comprise in total six MOSFETs (30u, 30v, 30w; 31 u, 31 v, 31w) in a third group and a fourth group, wherein - respectively one MOSFET (20u, 20v, 20w) of the first group lies in series with one MOSFET (30u, 30v, 30w) of the third group, between the positive supply line (14+) and one of the lines (22, 23, 24) to the phase windings (u, v, w), - respectively one MOSFET (21 u, 21 v, 21w) of the second group lies in series with one MOSFET (31 u, 31 v, 31w) of the fourth group, between the negative supply line (14-) and one of the lines (22, 23, 24) to the phase windings (u, v, w), so that respectively two MOSFETs are arranged between each supply line (14+, 14-) and each of the lines (22, 23, 24) leading to the phase windings (u, v, w), and in that - respectively at least one MOSFET of the four MOSFETs connected to a line (22, 23, 24) is arranged with its parasitic diode in the forward-bias direction in relation to the vehicle DC electrical system, and wherein - at least one of the diodes in one of the groups of MOSFETs (20, 30, 21, 31 (is connected in the reverse-bias direction.