| 摘要 |
The disclosed fault-current protective switchgear has an amplifier circuit (4) for generating a fault-voltage (UA) derived from a fault-current, a comparator circuit (10) for comparing the fault-voltage (UA) with a reference voltage (Uref), and a reference circuit (12) connected to a supply unit (15) for generating the reference voltage (Uref), as well as an operating voltage (UB) for the amplifier circuit (4). Means are provided which, when the output voltage (UN) of the supply unit (15) falls under a predetermined value (UZ), increase the reference voltage (Uref) at least up to the momentary operating voltage (UB') at least when the fault-voltage (UA) is smaller than the reference voltage (Uref).
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