How do I convert the fuse current rating to the i2t value? For example, in this circuit simulator, when adding a fuse, the only values that can be specified are the i2t value and resistance. The fuse I am attempting to simulate says 32mA.

  • 1
    \$\begingroup\$ You can't. You need to also know the fuse's trip time. \$\endgroup\$
    – Hearth
    Jan 16 at 23:35
  • \$\begingroup\$ @Hearth I added a link to the fuse datasheet, where they actually list the i2t value (who knew?!) But if it was unknown, how would one calculate the i2t if trip time was known? \$\endgroup\$ Jan 16 at 23:46
  • \$\begingroup\$ it's in the name: square the current and multiply by time. \$\endgroup\$
    – Jasen
    Jan 17 at 1:59

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 .


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