Technically speaking i'm a noobie in this field . But i did search a lot and made some research to gather some info regarding my college work .
idea is to use a current sensor ACS712 current sensor for a three phase line application , so to use the current sensor to read the optimal current value in three phase line say 30 A , once that optimal value crosses beyond its limit due to some fault , acs712 should detect it , inform to an arduino , and arduino opens the contactor relay to disconnect the power supply towards the '3 phase' motor .
acs712 has just 2 input terminals , i'm planning to incorporate this unit into this particular work . will be really helpful is someone really helped me in what way things should be interconnected . i meant the wiring .