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Keep in mind that fuses are thermal devices, and they work by getting hot as current flows through them.

For a massive 1000% overload, the fuse element will blow very quickly, no problem, nothing else has much chance to get hot. But for maybe a 125% overload, things just sit there, getting hot for several minutes, before the body and wires are hot enough that they're no longer effectively heatsinking the fuse element and finally the element heats itself past its melting point, and the fuse blows. But in the meantime, what becomes of a thermoplastic fuseholder?