Patent ID: 7834290

Claim:
A protection switch, comprising: at least one single-pole protection switch module including: a housing; a switching arm; a fixed contact; a moving contact carried by said switching arm and being pivotably movable against said fixed contact between a closed position and an open position; a manual operating mechanism for manually adjusting said switching arm between said closed position and said open position; a tripping mechanism for automatically resetting said switching arm into said open position upon occurrence of a tripping condition, said tripping mechanism having a trip slider; a short-circuit trip device having a magnetic coil, a magnetic yoke and a magnetic armature connected with a plunger for advancing said trip slider; a quenching device for quenching a switching arc, said quenching device having a quenching chamber with first and second side walls and an inlet and an outlet for the arc; a first running rail connecting said fixed contact with said first side wall of said quenching chamber, said first running rail being disposed integrally with said magnetic yoke; a stopping surface at which said moving contact rests in said open position of said switching arm; a second running rail connecting said stopping surface with said second side wall of said quenching chamber; and a separation strip extending substantially from side wall to side wall of said quenching chamber, being molded onto said outlet of said quenching chamber and damming up said outlet of said quenching chamber by about 35% to 50% as compared with said inlet.