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Monitor and Protection Alarm Over Current Circuit Diagram


The electronic circuit described in this article's main function remote monitoring of power consumption (over current) in a domestic mains alternating current. This monitoring is necessary in many systems, especially in electronic counters, power supplies, AC, inverters, converters, etc.

The operation of the circuit is simple, to be connected to the power grid, and when the circuit detects a consumption in the electric network of more than 5 mA he lights LA1 signal lamp. The device can work with currents of several amperes, it depends on the diode used in D1 and D2. The Ti1 transistor is turned on when the D1 and D2 drop exceeds a certain level.


Monitor and Protection Alarm Over Current Circuit Diagram




Fuse F1 must of course be dimensioned to suit the application and current limit circuit. When Ti1 leads the alternating current can flow through the capacitor, and the triac is triggered, so that lights the lamp LA1.



The above circuit is a current alarm of some changes, there is a bridge rectifier formed by diodes D4 to D7, which was added only to supply the voltage to the coil of the relay Re1, that when the current through D2 exceeds a di-certain set level. The capacitor C1, may need to be resized to fit the sensitivity of the chosen relay coil.

Conclusion

Ti1 can be any transistor, just make sure that it can work with voltages up to 700 V. For D1 and D2, are recommended diodes 1N4000 series that can be used for currents up to 1 Amp or types 1N5400 supporting up 3 Amps. Watch out! This circuit works with the current network continues to play home that can be fatal, read our text on the Site Responsibility.



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