What is the difference between a DC fuse and an AC fuse?

Current limiting fuse refers to the fuse that can safely cut off all possible current within its rated current and current limiting range, which is divided into two categories: DC fuse and AC fuse, the two fuses have the same function, the shape structure is also very similar, but in other aspects there are some differences, the difference between fuses AC and DC is mainly:

1, the breaking current process is different

Alternating current is conducted in sinusoidal waveform alternately, and the weekly wave has a zero crossing, when the electric quantity is the lowest, the arc is easily extinguished.   Any waveform of direct current does not exist zero crossing, when the DC short-circuit fault current is broken, it depends on the rapid vaporization of the fuse plate and the diffusion adsorption and cooling of quartz sand to force out the arc, so it is much more difficult than breaking the AC arc.

2, the arc energy generated is different

Under the same rated voltage, the arc energy generated by a DC arc is more than 2 times that of AC arc energy.