I need some detail of shunt trip mechanism

[electronicbeginner]

I know shunt trip using the magnetic field of an energized coil to trip circuit breaker. But how do I know the minimum current through the coil which would have strong enough magentic field to trip a 20 amps CB?

Thank you! I am new to this place. Hope can get your help!

 

[busbar]

From

http://www.ch.cutler-hammer.com/

"The Shunt Trip provides remote controlled tripping of the circuit breaker. The shunt trip consists of an intermittent rated solenoid with a tripping plunger and a cutoff switch assembled to a plug-in module."

 

[electronicbeginner]

Thank you, Busbar!

Does this mean shunt trip rating has nothing to do with circuit breaker rating? It actually trip CB by mechanical means?

 

[dpc]

Yes the shunt trip generally requires a separate source of control power. You need to specify the operating voltage when you buy the shunt trip.