Man-wai Chang Inscribed thus:

It has 18 volts instead of 12 volts, but it uses the same diameter
coaxial connector. A fast fuse protects in 400 microseconds, but the
slow blow does not blow that fast so the 45 nanometer digital device
gets melted in 1000 microseconds.

Is the 13A BS1362 fuse a fast blow one?

No !

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Best Regards:
Baron.