Siemens Aktiengesellschaft

Gert Fischer

Norbert Zimmermann

Heinrich Hassler

Joachim Grosse

Joachim Hannich

Franz Mende

Helmuth Baldauf

A coil for electromagnetically actuating a switching device. The coil includes terminal connections retained in a coil flange for the coil where there are recesses in the flange to accommodate electrical components. The terminal connections are developed as a joint bar, and the joint bar serves as a mechanical holding device for one of the sides of two diodes of a rectifier bridge configured on opposite sides of the joint bar. The one side of the two diodes is soldered to the joint bar. These elements are inserted as a unit into the recesses of the coil flange.

Coil for electromagnetically actuating a switching device

A method of manufacturing a contact bridge for an electric switching apparatus which contact bridge includes an electrically highly conductive overlay and a concave-shaped support layer. The method comprises the steps of pressing a powder blank comprising two layers of metallic material, one of which comprises iron for the support layer and the other of which comprises copper for the overlay; sintering the blank in a protective gas; sizing the blank; further sintering the blank in a protective gas; further pressing the blank by reverse-flow cup extrusion; and applying an electrical contact to the overlay. Alternatively, the powder blank may comprise a layer of copper-zirconium and silver-metal oxide, the latter for an electrical contact layer. In this embodiment, the contact bridge is formed with the electrical contact in one step and there is no need to apply a contact to the bridge after the pressing by reverse-flow cup extrusion.

Method of manufacturing a contact bridge

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Amberg, Germany

Gert Fischer