Patent ID: 7081596

Claim:
An arc-quenching device for a circuit breaker having double-break contacts, comprising two fixed contacts which are connected to connection terminals of the circuit breaker and which, in a closed position of the switch, are in contact with two link contacts of a moveable contact link, two prechambers, separated by a partition wall, each having two arc guide rails, of which a connection-side arc guide rail is connected to a fixed contact, and a link-side arc guide rail is formed for the purpose of taking over an arc from the contact link, two quenching chambers, connected to the prechambers, each having an arc splitter stack which is connected to the respective arc guide rails, wherein a magnetic shield is provided for the purpose of intensifying the magnetic forces acting on a first arc which is formed between the first link-side and the first connection-side arc guide rails, and wherein the magnetic shield is arranged such that it closes off the arc area at the sides, said arc area being defined between the two arc guide rails.