Residual current safety switch

H - Electricity – 02 – H

Patent

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Details

H02H 3/33 (2006.01) H02H 1/06 (2006.01)

Patent

CA 2181904

A residual current safety switch has a residual current transformer (3) connected to an evaluation circuit (5) that controls an electromagnetic trigger (K1) for actuating switching contacts (1, 2). An overvoltage protection circuit (V1), for example designed as a voltage-dependent resistance, is provided. The evaluation circuit (5) and or the overvoltage protection circuit (V1) are connected to terminals that supply them with voltage when the switching contacts (1, 2) are closed through lines (7, 8) one of which extends through the residual current transformer (3) and the other not. The supply current of the electronic components and/or the current that flows through the overvoltage protection circuit (V1) is lower than the triggering current when the set voltage is applied.

Un disjoncteur de protection à courant différentiel résiduel comprend un transformateur (3) de courant différentiel résiduel connecté à un circuit d'évaluation (5) qui commande un déclencheur électromagnétique (K1) de contacts de commutation (1, 2). Un circuit (V1) de protection contre des surtensions, par exemple sous forme d'une résistance dépendant de la tension, est également prévu. Le circuit d'evaluation (5) et/ou le circuit (V1) de protection contre la surtension sont connectés à des bornes qui les alimentent en tension lorsque les contacts de commutation sont fermés (1, 2) par l'intermédiaire de lignes (7, 8) dont l'une traverse le transformateur de courant différentiel résiduel (3) et l'autre non. Le courant d'alimentation des éléments électroniques et/ou le courant qui s'écoule à travers le circuit (V1) de protection contre la surtension est inférieur au courant de déclenchement, à la tension nominale.

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