| 摘要 |
The device detects a predetermined variation of the current in a DC circuit and, by illuminating an alarm lamp, gives a warning of any malfunctioning. Such malfunctioning may arise either from a variation in voltage or from a variation in the circuit resistance. The device comprises a current coil (BI) wound on a reed switch (IA) and a permanent magnet (AP). The magnetic fields of (BI) and (AP) oppose each other and cancel each other out when everything is normal, but in the event of any malfunctioning one of the fields is predominant and actuates the reed switch, causing an alarm lamp (LA) to be illuminated. <IMAGE>
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