Circuit breaker

Automatic switch, comprising a dish-shaped two-part narrow housing for holding the switch having a rectangular profile, a front and walls, first and second terminals, a partition formed of insulating material, two arcing chambers in the vicinity of said first terminal being disposed one behind the other widthwise in said housing on either side of said partition, an additional armature system being disposed in the vicinity of said first terminal and in the immediate vicinity of said arcing chambers, a bridge of insulating material separating said additional armature system from said arcing chambers, said additional armature system having an exit opening formed therein and having a striker pin movable through said exit opening, a switch latch being disposed in front of said exit opening and having a manual actuating member protruding substantially centrally from the front of said housing, a forked movable contact lever disposed directly adjacent to said additional armature system, said movable contact lever being rotatably supported at a support point by said switch latch, being directly actuatable by said striker pin, and having two movable contacts disposed thereon being openable by said switch latch, a tripping lever being attached to and extended beyond said switch latch diametrically opposite to said support point, an overload tripping device being disposed in the vicinity of said second terminal and in the vicinity of and parallel to one of said housing walls, said overload tripping device having a free end for acting on said tripping lever and a clamped end, said overload tripping device being formed on a thermo-bimetal causing said switch latch to open said movable contacts upon the occurrence of an overload current, and a short-circuit current tripping device having a magnetic end tripping device also acting directly on said tripping lever for causing said switch latch to open said movable contacts upon the occurrence of a short-circuit current.