| 摘要 |
A DI fault current leakage guard switching device for detecting improperly wired networks or missing connections includes a totalizing current transformer for detecting fault currents in a phase conductor line and a neutral conductor line, a switching stage, a DI guard switch, and a detecting unit for detecting fault conditions of a protective earth conductor line. The detecting unit receives signals on the phase conductor line, neutral conductor line and protective earth conductor line, respectively. The detecting unit is connected to the switching stage for controlling the DI guard switch.
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