| 摘要 |
<p>A residual current operated circuit breaker for protection against a ground leakage current that is higher than a preset threshold value in a low-voltage electric circuit, the circuit being connected to a ground electrode and supplying at least one load connected to the ground electrode by means of a protection conductor, comprising: -a supplemental conductor, suitable to be functionall y connected, in input to the circuit breaker, to the ground electrode and, in output from the circuit breaker, to the load protection conductor; -sensing means, which are functionally associated with the supplemental conductor and the active conductors and are suitable to detect the presence of a ground leakage current in the active conductors and/or in the supplemental conductor and to provide an actuation signal that causes the intervention of the release unit and the separation of the contacts when the value of the leakage current in the active conductors, reduced by a predefined quantity that is proportional to the leakage current flowing, if any, in said supplemental conductor, exceeds said threshold value.</p> |
