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what is the use of shunt coil in ACB?
What are the functions of shunt trip coil in ACB
So, you think that's the same guy?
Funny think is the next relevant question has the answer, just not specific to the ACB...
Funnier yet, the third relevant question down spells out "air circuit breaker"
He can't make the logical jump, I guess.
To operate the ACB by using an electrical signal.