| 摘要 |
A personnel protection circuit for electrical supply systems comprises a normally closed switch connected between a source of electric power and a load. Two parallel conductors are connected between the switch and the load, and include a control circuit having a current unbalance detector for detecting current unbalance between the two conductors. Upon detection of such current unbalance, the normally closed switch is opened thereby disconnecting the electrical supply. Such control circuit devices may be included in both lines of the electrical supply system between the source and the load, or alternatively, further control circuit devices may be provided at both the source end and the load end of the parallel conductors.
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