What would you like to do?

What is a flaw in a circuit that allows a large current to flow where not wanted called?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

What happens to the steel cylinder on the circuit breaker if a large current flows through the coil?

I take it you mean the iron (rather than steel) core of the solenoid. If the current reaches the limit set, it is attracted against a spring by the resulting magnetic field cr