Abstract: The replacement unit includes a magnet circuit support magnetic barrier member which includes the magnet unit of a Hall generator and is adapted to be fastened to the contact interrupter plate. The unit also includes a distributor rotor adapted for mounting on the contact interrupter cam of the distributor shaft. A plastic reinforcing member of higher mechanical strength is anchored in the distributor rotor. It has a keying projection and extends over the region surrounding said projection, thereby reinforcing the critical section of the distributor rotor. Preferably it is cap-shaped and has an opening for accommodating a retaining member which retains the distributor rotor in the desired position.

Abstract: To improve operating reliability and centric guidance of the switch contacts in sealed breaker contact assemblies, a carrier bolt, extending through a flexible membrane into a chamber, and carrying a movable contact, is operated by a lever which has a lever arm movable in the direction of the cam shaft of the breaker assembly, the lever being V-shaped and pivoted at the apex of the V, and engaging the cam shaft with an arm which is opposite to the arm which operates the contact bolt.