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Like the title says, how long does it take in seconds to burn a fuse? Of course it will depend on what type of fuse and the one I'm using is 61NM 250V/8A but looking at datasheets I could find on them, they usually have numbers only up to 200% of rated amp. My question is, would something like a quick surge current of 50A that last 1 micro second burn the fuse? Right now, there is a surge protection before the fuse which when I asked the manufacturer should kick in in few nanoseconds (which seems little too fast to be honest but) but I'm wondering even with surge control, if a very short duration but high current could potentially burn the fuse.

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Well, from this datasheet: 50A will burn the fuse in 100ms.

So, 50A for 1µs will not burn the fuse.

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If you're unsure how to read these diagrams, check out this guide.

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