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Small DC fuses (a wire in a glass cylinder) are often used in motor vehicles; they may be rated at 12 Volts and 1-10Amps. It is relatively easy to interrupt voltages like 12V. It is much harder with voltages of 115V and above.But overall, it is harder to break a DC arc than an AC arc of the same voltage and current. This is because the AC current drops to zero 100 times per second, giving lots of opportunities for the arc to go out. A DC current does not drop to zero, and could potentially continue indefinitely if there is not a suitable fuse or circuit-breaker in use.When you have voltages of 11kV and higher, these can maintain a spark that is perhaps 10cm long, and dissipates a lot of heat (ie fire risk). To quench this spark, higher-voltage fuses often have a hollow tube which is packed with sand. When the fuse blows, the arc melts the sand, forming glass which helps quench the spark.See: https://en.wikipedia.org/wiki/Fuse_(electrical)#Construction
what does 10cm mean here.
I have seen when i short the wire each other than also the supply does break why this happen