How to calculate fuse i2t rating when current is known?
You simply get these parameters from the fuse data sheet or compute from the curves.
Here I gave you some fuses to blow and sliders to increase the surge load.
Now you enter 0.000047 for i2t and compute R from 3200mV/32mA = 100 then add your load and watch the fuse get hot. Time sample around 500us for real-time .