| 摘要 |
A residual current safety switch has a residual current transformer (3) conn ected to an evaluation circuit (5) that controls an electromagnetic trigger (K1) for actuating switching contacts (1, 2). An ov ervoltage 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 connecte d to terminals that supply them with voltage when the switching contacts (1, 2) a re closed through lines (7, 8) one of which extends thro ugh the residual current transformer (3) and the other not. The supply current of t he electronic components and/or the current that flows t hrough the overvoltage protection circuit (V1) is lower than the triggering current when the set voltage is applied.
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