The difference between a fuse and a circuit breaker:

The same point is that it can achieve short-circuit protection. The principle of the fuse is to use the current to flow through the conductor to make the conductor heat, and the conductor melts when the melting point of the conductor is reached, so the circuit is disconnected to protect the electrical appliances and lines from being burned. It is an accumulation of heat, so overload protection can also be achieved. Once the melt is burned, the melt must be replaced.

The circuit breaker can also realize the short circuit and overload protection of the line, but the principle is different. It realizes the circuit breaker protection through the current bottom magnetic effect (electromagnetic tripper), and realizes the overload protection through the thermal effect of the current (not a fuse, usually no need to replace the device) .

In practice, when the electrical load in the circuit is close to the load of the fuse used for a long time, the fuse will gradually heat up until it blows. As mentioned above, the fusing of the fuse is the result of the combined action of current and time, which protects the line. It is a one-off.

The circuit breaker is a sudden increase in the current in the circuit. When the load of the circuit breaker exceeds the load, it will automatically open. It is a protection for an instantaneous current increase in the circuit, such as when the leakage is large, or short circuit, or instantaneous current Great protection.

When the reason is found out, it can be switched on and used again. As mentioned above, the fusing of the fuse is the result of the combined effect of current and time, and the circuit breaker will trip as long as the current exceeds its set value, and the effect of time can hardly be considered. 

Circuit breakers are commonly used components for low-voltage power distribution.There are also some places where fuses are suitable.

 

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