[nucleardog]

And just to provide some perspective… typical household breakers work very similar to this.

If your 15A breaker tripped instantly when the current exceeded 15A, you’d be resetting a breaker every time you turned on a stand mixer or something.

Instead they have two mechanisms of action—thermal and electromagnetic.

The thermal trip time varies depending on how much you’ve exceeded the rated current, but for a typical household breaker could be a couple of minutes.

The electromagnetic trip is the “hard cutoff” where as soon as you exceed that limit the breaker trips near instantly. Depending on the type of breaker this is usually 5-10x its rated current. So your 15A breaker may allow you to briefly pull 75-150A through it.

So while these fuses are mislabeled and should not be sold, it’s not as much of a death trap as it might appear on first glance from what it sounds like.