A Voltage Sourced Converter, VSC, for a High Voltage Direct Current, HVDC, power converter, the VSC comprises a bridge circuit for each of one or more phases of an AG network. The bridge circuit has two arms, each arm connecting the supply to a pole of a DC terminal, wherein each arm of the bridge circuit has one or more semiconductor modules capable of being switched between an on-condition, in which a capacitor of the module is in-line in the arm of the bridge circuit, and an off-condition, in which the capacitor is out of line. A DC current fault detection arrangement detects a fault arising at one or the other of the poles of the DC terminal within the DC converter or the DC grid. A controller responsive to the detection of the DC current fault switches one or more of the semiconductor modules in one of the arms of the bridge to the on and one or more of the semiconductor modules of the other arm of the bridge circuit to the off-condition.