| 摘要 |
<p>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.</p> |
