A switch unit 200 for a voltage circuit breaker that includes a first switch contact 202a and a second switch contact 202b. The first switch contact 202a is movable between a first position in which the first switch contact 202a contacts the second switch contact and a second position in which the first and second switch contacts 202a, 202b are separated from each other. Further, a positioning element to position an arc chute 100 on the switch unit. The arc chute 100 includes at least two stacks 102, 106 of a plurality of substantially parallel metal plates 104, 104a, 104b, . . . , 104n, 108, 108a, 108b, . . . , 108n. The switch unit includes a first connection device 120, 230a capable to electrically connect the first switch contact 202a to a predetermined metal plate 104a selected of the most proximal 25% metal plates of the first stack 102. A second connection device 122a 122b, 230b capable to electrically connect the second switch contact to a predetermined metal plate 108a selected of the most proximal 25% metal plates of the second stack 106.