Patent ID: 8735757

Claim:
A switch unit for a circuit breaker comprising: a first switch contact; a second switch contact, wherein the first switch contact is movable between a first position in which the first switch contact contacts the second switch contact and a second position in which the first and second switch contacts are separated from each other; a positioning element to position an arc chute on the switch unit, wherein the arc chute comprises at least two stacks of a plurality of substantially parallel metal plates; a first connection device that electrically connects the first switch contact to a predetermined metal plate selected of a most proximal 25% metal plates of the first stack; a second connection device capable to electrically connect the second switch contact to a predetermined metal plate selected of the most proximal 25% metal plates of the second stack; a first horn electrically connected to the first switch contact, wherein the first switch contact is adapted to guide a first foot of an electric arc to the arc chute; and a second horn electrically connected to the second switch contact adapted to guide a second foot of the electric arc to the arc chute, wherein at least one of the first horn and the second horn have a fixed first end in the direction of the at least one first and second switch contact, and a resilient second end opposite to their respective first end, wherein the second end is movable in the direction of the arc chute to be mounted on the switch unit.