A current control circuit for connection between a first bi-pole DC electrical network and a converter, the converter including at least one energy storage device, the current control circuit comprising: first and second input terminals (24,26) for connection to the first electrical network; first and second output terminals (28,30) for respective connection to converter terminals (46,48) of the converter; first and second switching limbs, the first switching limb interconnecting the first input and output terminals (24,28), the second switching limb interconnecting the second input and output terminals (26,30), each switching limb including a respective switching element (32,34,36,38); a director limb extending between the first and second output terminals (28,30), the director limb including a first and a second director limb portions (78,80), the first and second director limb portions (78,80) separated by an intermediate terminal of the director limb, the first director limb portion extending between the first output terminal and the intermediate terminal, the second director limb portion extending between the second output terminal and the intermediate terminal, each director limb portion (78,80) including a respective current director element and a respective first resistive element connected in series; a second resistive element, a first end of the second resistive element operably connected to the intermediate terminal, a second end of the second resistive element operably connectable to ground; and a controller programmed to selectively control switching of each switching element (32,34) so as to, in use, regulate a flow of current from the first electrical network to the converter. first and second input terminals (24,26) for connection to the first electrical network; first and second output terminals (28,30) for respective connection to converter terminals (46,48) of the converter; first and second switching limbs, the first switching limb interconnecting the first input and output terminals (24,28), the second switching limb interconnecting the second input and output terminals (26,30), each switching limb including a respective switching element (32,34,36,38); a director limb extending between the first and second output terminals (28,30), the director limb including a first and a second director limb portions (78,80), the first and second director limb portions (78,80) separated by an intermediate terminal of the director limb, the first director limb portion extending between the first output terminal and the intermediate terminal, the second director limb portion extending between the second output terminal and the intermediate terminal, each director limb portion (78,80) including a respective current director element and a respective first resistive element connected in series; a second resistive element, a first end of the second resistive element operably connected to the intermediate terminal, a second end of the second resistive element operably connectable to ground; and a controller programmed to selectively control switching of each switching element (32,34) so as to, in use, regulate a flow of current from the first electrical network to the converter.