Switch disconnector with an arc extinguishing shield plate
A switch disconnector comprises an electrical contact system for breaking a circuit connectable to the switch and a ferromagnetic plate being positioned in a predefined distance to the electric contact system, wherein the predefined distance is selected such that the magnetizing force of the ferromagnetic plate on an electric arc occurring between separated contacts of the electric contact system pulls the arc onto the ferromagnetic plate for interruption of the arc.
1 . A switch disconnector comprising:
an electrical contact system for breaking a circuit connectable to the switch disconnector, the electrical contact system comprising a fixed contact and a moving contact, wherein the fixed contact and the moving contact are inclined with regard to a moving direction of the moving contact of the electrical contact system, and
a ferromagnetic plate being positioned substantially parallel to the moving direction of the moving contact and within a predefined distance from the electrical contact system, wherein the ferromagnetic plate comprises at least one arm extending from a side of the ferromagnetic plate towards the electrical contact system, wherein the at least one arm comprises an inclined edge,
wherein the predefined distance is selected such that a magnetizing force of the ferromagnetic plate on an electric arc occurring between separated contacts of the electrical contact system pulls the electric arc onto the ferromagnetic plate for interruption of the electric arc.
2 . The switch disconnector claim 1 , wherein the ferromagnetic plate comprises at least one protrusion for fixation of the ferromagnetic plate within a housing of the switch disconnector.
3 . The switch disconnector of claim 1 , wherein the ferromagnetic plate has a thickness being selected to provide a predefined magnetic saturation level at a predefined operating current.