Three phase auto changer circuit


Posted on Feb 5, 2014

This circuit is a modification of High & Low voltage cut-off with delay& alarm circuit appeared in Circuits today, which I have tried and found to be quite reliable. You can adopt this circuit with small modification. Use a transformer with secondary 15 0 15 AC Volt at 500mA, for 18Volt relay opera


Three phase auto changer circuit
Click here to download the full size of the above Circuit.

tion. Normally any modern electrical / electronic equipment can operate with 230 Volt ± 15% AC supply. That is, it can stand normal voltage operating range of 195 to 265 Volts. It may misbehave beyond this voltage range. You can choose the practical voltage required for the low end high cut off to change over to other phase.




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