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.

断路器也可以实现线路的短路和过载保护，不过原理不一样，它是通过电流底磁效应（电磁脱扣器）实现断路保护，通过电流的热效应实现过载保护（不是熔断，多不用更换器件）。具体到实际中，当电路中的用电负荷长时间接近于所用熔断器的负荷时，熔断器会逐渐加热，直至熔断。

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.

像上面说的，熔断器的熔断是电流和时间共同作用的结果起到对线路进行保护的作用，它是一次性的。而断路器是电路中的电流突然加大，超过断路器的负荷时，会自动断开，它是对电路一个瞬间电流加大的保护，例如当漏电很大时，或短路时，或瞬间电流很大时的保护。

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.

当查明原因，可以合闸继续使用。正如上面所说，熔断器的熔断是电流和时间共同作用的结果，而断路器，只要电流一过其设定值就会跳闸，时间作用几乎可以不用考虑。断路器是现在低压配电常用的元件。也有一部分地方适合用熔断器。

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.