Fuse：fuse is a simple circuit protection device, the principle is that when the current through the fuse to reach or exceed the set value for a certain period of time, the fuse itself melt, cut off the circuit. Its action principle is simple, the installation is convenient, generally not used alone, mainly used to cooperate with other electrical appliances.
First, the current to reach a certain value, the value of the fuse before leaving the factory has been set up, cannot be changed.
Second, current reaches a certain value after a certain period of time, the time is also set up by factory, cannot be changed, but has a lot of types, including the delay action, fast action, super fast action, etc..
Third, the body is damaged after action, cannot be reused, must be replaced.