Disclosed is a voltage converter (10) comprising at least one arm (24) extending between a first DC terminal (16) and a second DC terminal (28) and comprising at least one upper half-arm (24u) and one lower half-arm (24l) that are connected, each half-arm comprising a chain of submodules (30), the converter comprising a filtering module (34) and at least one circuit-breaker device (40) connected between a mid-point of the arm and the first DC terminal, the circuit-breaker device being able to assume an open position and a closed position, the circuit-breaker device being configured to open when the voltage across terminals of the upper half-arm of the at least one arm reaches the maximum voltage that can be generated by the chain of submodules of the upper half-arm.