FIELD: electric engineering. SUBSTANCE: device has two parallel circuits each of which has contact pair and single-way conductor. Conductors in circuits are connected in opposing. Another claim of invention describes device design in which contact plate of one contact of each contact pair of switch contains single-way conductor. Conductors in circuits are connected in opposing. In addition single-way conductors may be designed as diode which has no jacket and is located between contact sheet and its contact plate and is connected to it. EFFECT: simplified design. 3 cl, 4 dwg
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