First, because sometimes the motor is damaged before it is over-current, and sometimes it is not over-current. In this way, the circuit breaker as a circuit protection either does not work or has a certain hysteresis. Sexual characteristics.

Secondly, the air breaker selection is generally based on 1.2 ~ 1.3 times the total current. If it is a motor, the starting current must be considered, which is generally much higher than 1.3 times. This has contradictions. Therefore, in summary, Line breakers are not intended to protect motor circuits.

Secondly, this type of small wiring circuit breaker has no protective effect on personal electric shock and power imbalance, so it must not be used as a protector against personal electric shock and power imbalance, because the distribution circuit breaker is only under overload and short circuit Action, leakage is not in the scope of its action.

Finally, it is mentioned that if this kind of small wiring breaker is used in a residential circuit, it is often used together with a leakage circuit breaker, which can well take into account the role of protecting the circuit and protecting personal safety.