The same point is to achieve short-circuit protection, the principle of the fuse is to use the current flow through the conductor will make the conductor heat, to reach the melting point of the conductor after melting, so disconnect circuit protection with electrical appliances and lines are not burned. It is an accumulation of heat, so overload protection can also be achieved.
The melt will be replaced once the melt is burnt. Circuit breakers can also achieve short circuit and overload protection, but the principle is not the same, it is through the current bottom magnetic effect (electromagnetic tripping device) to achieve circuit protection, through the thermal effect of the current to achieve overload protection (not fuse, many do not replace the device). In practice, when the electrical load in the circuit is close to the load of the fuse used, the fuse will gradually heat up until the fuse is blown. As said above, fuse fuse is the effect of current and time together to protect the circuit, it is disposable. And circuit breaker is a circuit in the sudden increase in the current, more than the load of the circuit breaker, will automatically disconnect, it is the circuit of an instantaneous current increased protection, such as when the leakage is very large, or short-circuit, or the instantaneous current is very large protection. When the cause is identified, it can be used to continue. As mentioned above, fuse fuse is the result of the interaction between current and time, and the circuit breaker, as long as the current is over its set value will trip, the time effect can be almost without consideration. Circuit breaker is a common component of low voltage power distribution. There are also parts that are suitable for fuses.
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