A secondary shunt releases (extra trip coil) is used for
electrical tripping of the circuit breaker by protective
relays or manual control devices when more than one
trip coil is required.
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You need to be more specific. Do you want a contact telling you if a circuit breaker is on? If that is your question, the answer depends on the model of the breaker.
you can use a fuse or circuit breaker
Generally a circuit breaker (like a light switch) But I guess you could use a resistor of the right resistance If you are talking about the circuit breaker there is an electromagnetic coil in it which get magnetized on a specific amount of current and breaks the circuit
They are completely different. A moulded-case circuit breaker is a low- or medium-voltage device, whereas an air circuit breaker is a very large circuit breaker designed for use in high-voltage transmission/distribution substations.
No. A relay is an electric switch and a circuit breaker is an overcurrent device.