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Reed switch current sensor circuit diagram

2014-11-06 13:42  
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Reed switch current sensor circuit diagram
As shown in the figure, it is a current sensor circuit, when the switch closes, if all the bukbs work normally, it has rated current in current coil, then under the action of magnetic force which is produced by coil, the reed switch closes, if the bulb wire is breaking, the related current reduces, the magnetic force drops off, it makes reed switch cut off, then it will alarm.