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I2t Calc on semi-conductor fuses

I2t Calc on semi-conductor fuses

I2t Calc on semi-conductor fuses

(OP)
Vendors for Semiconductor fuses normally may supply let-through charts as well as melting and clearing I2t figures. When used for dc application where the short circiut waveform is known to have the following equation I(t)=Isc(1-exp(-at)), what method will be more accurate:

Method 1: Use the Let-thru chart, with Iprospective= Isc to determine the let through current, Ic, and then use the equation above to find the melting time. Note in this method the published melting I2t is not used.

Method 2: Use the melting I2t data and equate it the square of the above equation and solve iteratively for the melting time, and the let-thru current Ic.  note this method does not use the let-through charts

Both of the above methods provide  significantly different answers.

RE: I2t Calc on semi-conductor fuses

(OP)
Any volunteers?

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