They have the same point is that they can achieve short-circuit protection. The principle of fuse is to use the current flowing through the conductor to make the conductor heat up. After reaching the melting point of the conductor, the conductor melts, so the circuit is disconnected to protect the electrical appliances and lines from being burnt out. It is a accumulation of heat, so it can also achieve overload protection. Once the melt is burned, the melt should be replaced.

斷路器也可以實現線路的短路和過載保護，不過原理不一樣，它是通過電流底磁效應（電磁脫扣器）實現斷路保護，通過電流的熱效應實現過載保護（不是熔斷，多不用更換器件）。具體到實際中，當電路中的用電負荷長時間接近于所用熔斷器的負荷時，熔斷器會逐漸加熱，直至熔斷。

The circuit breaker can also realize the short circuit and overload protection of the line, but the principle is different. It realizes the open circuit protection through the bottom magnetic effect of the current (electromagnetic release), and realizes the overload protection through the thermal effect of the current (it is not fusing, and there is no need to replace the device). In practice, when the power load in the circuit is close to the load of the fuse used for a long time, the fuse will be heated gradually until it is fused.

像上面說的，熔斷器的熔斷是電流和時間共同作用的結果起到對線路進行保護的作用，它是一次性的。而斷路器是電路中的電流突然加大，超過斷路器的負荷時，會自動斷開，它是對電路一個瞬間電流加大的保護，例如當漏電很大時，或短路時，或瞬間電流很大時的保護。

As mentioned above, the fusing of fuse is the result of the combined action of current and time, which plays the role of protecting the line. It is disposable. The circuit breaker is a sudden increase in the current in the circuit, when it exceeds the load of the circuit breaker, it will automatically open. It is a protection for the instantaneous current increase of the circuit, such as when the leakage is large, or when the short circuit, or when the instantaneous current is large.

當查明原因，可以合閘繼續使用。正如上面所說，熔斷器的熔斷是電流和時間共同作用的結果，而斷路器，只要電流一過其設定值就會跳閘，時間作用幾乎可以不用考慮。斷路器是現在低壓配電常用的元件。也有一部分地方適合用熔斷器。

When the cause is found out, it can be switched on and used continuously. As mentioned above, the fusing of fuse is the result of the combined action of current and time, while the circuit breaker will trip as soon as the current exceeds its set value, and the effect of time can hardly be considered. Circuit breaker is a common component in low voltage distribution. Some places are suitable for fuse.