Here is my circuit breaker, it uses a op amp comparator,relay and a Sr latch. The 400 milliohm resistor can be made of wire and the value isn't that important,as long as you don't use too high of resistance, link to the video on how to make the shunt resistor http://youtu.be/fUOtMRuqssY The 1k resistor connected to the shunt resistor sets the load current. The 100 ohm and 1k resistor set the current,where it's voltage from the voltage divider is V = I*R or V = .4*I subscribe to my YouTube channel if you want to see this project in action this Christmas
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