i want to how a relay forward the fault command to the moving part of a circuit breaker? and where is the position of trip coil and closing coil? thanking you.

 

Hi,
The trip coil is located at the bottom of the driving mechanism-kindly refer the manufacturer's manual (also for location of closing coil). In case of a fault the electrical command from the relay goes to the trip coil to activate the same. As the trip coil energises, it releases the plunger of the trip coil which strikes the release shaft of the circuit breaker & trips the circuit breaker.

Hope this clarifies.