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Patent

Apparatus having automatic re-set means for detecting a fault current

R Reese
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TLDR
In this paper, the authors proposed a method for detecting fault current in a line and converting it to a proportional voltage signal, which is used to switch a solenoid to first and second positions depending upon the value of the signal.
Abstract
A device for detecting fault current. The device senses the current in a line and converts it to a proportional voltage signal. The voltage signal is used to switch a solenoid to first and second positions depending upon the value of the signal. The device will re-set itself after sensing a fault current when normal line current is restored.

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