Circuit breaker for breaking an AC current, the circuit breaker comprising: - a pair of breaker contact members with a first breaker contact member (22, 122, 222, 422) and a second breaker contact member (24, 124, 224, 424), wherein the first and second breaker contact members are separable from each other, whereby an arc (40, 140, 440) carrying an arcing current develops between the first and second breaker contact members; - an arcing contact member (32, 132, 232, 432) configured for letting an arc root of the arc (40, 140) jump from the second breaker contact member (24, 124, 224, 424) to the arcing contact member (32, 132, 232, 432), whereby the arcing current is commuted from the second breaker contact member (24, 124, 224, 424) to the arcing contact member (32, 132, 232, 432), the commuted arcing current having a first direction; and - a current-rectifying element (36, 136, 236, 436) electrically connected to the arcing contact member (32, 132, 232, 432) and configured for passing the commuted arcing current having the first direction, and for blocking a current having a second direction opposite to the first direction, wherein the current-rectifying element (36, 136, 236, 436) comprise(s) a solid-state semiconductor device, - the circuit breaker further comprising an arc-moving arrangement for moving the arc root from the second breaker contact member (24, 124, 224, 424) to the arcing contact member (32, 132, 232, 432), characterized in that the arc-moving arrangement comprises at least one of the following (i) to (ii): (i) a pressure-gradient-generating device for generating a pressure gradient pushing the arc towards the arcing contact member; (ii) a contact-moving device for moving the arcing contact member (32, 132, 232, 432) in such a manner that the distance between the first breaker contact member (22, 122, 222, 422) and the arcing contact member (32, 132, 232, 432) becomes shorter than the distance between the first breaker contact member (22, 122, 222, 422) and the second breaker contact member (24, 124, 224, 424). - a pair of breaker contact members with a first breaker contact member (22, 122, 222, 422) and a second breaker contact member (24, 124, 224, 424), wherein the first and second breaker contact members are separable from each other, whereby an arc (40, 140, 440) carrying an arcing current develops between the first and second breaker contact members; - an arcing contact member (32, 132, 232, 432) configured for letting an arc root of the arc (40, 140) jump from the second breaker contact member (24, 124, 224, 424) to the arcing contact member (32, 132, 232, 432), whereby the arcing current is commuted from the second breaker contact member (24, 124, 224, 424) to the arcing contact member (32, 132, 232, 432), the commuted arcing current having a first direction; and - a current-rectifying element (36, 136, 236, 436) electrically connected to the arcing contact member (32, 132, 232, 432) and configured for passing the commuted arcing current having the first direction, and for blocking a current having a second direction opposite to the first direction, wherein the current-rectifying element (36, 136, 236, 436) comprise(s) a solid-state semiconductor device, - the circuit breaker further comprising an arc-moving arrangement for moving the arc root from the second breaker contact member (24, 124, 224, 424) to the arcing contact member (32, 132, 232, 432), characterized in that (i) a pressure-gradient-generating device for generating a pressure gradient pushing the arc towards the arcing contact member; (ii) a contact-moving device for moving the arcing contact member (32, 132, 232, 432) in such a manner that the distance between the first breaker contact member (22, 122, 222, 422) and the arcing contact member (32, 132, 232, 432) becomes shorter than the distance between the first breaker contact member (22, 122, 222, 422) and the second breaker contact member (24, 124, 224, 424).