What are the types of four pole moulded case circuit breakers

There are six types of four pole moulded case circuit breakers:

1) The N-pole of molded case circuit breaker does not have over-current release, and the N-pole is closed and opened together with the other three phase line poles;

2) The N-pole of the molded case circuit breaker does not have an over-current release, and the N-pole is always connected and does not disconnect with the other three phase line poles;

3) The N-pole of molded case circuit breaker is provided with an over-current release, and the N-pole is closed and opened together with the other three phase line poles;

4) The N-pole of molded case circuit breaker is provided with an over-current release, and the N-pole is always connected without being disconnected together with the other three phase line poles;

5) The N-pole of the molded case circuit breaker is equipped with a neutral line break protector, and the N-pole and the other three phase line poles are closed and opened together;

6) The N-pole of the molded case circuit breaker is equipped with a neutral line break protector. The N-pole is always connected and is not disconnected together with the other three phase line poles.