Current fuse thermal value

The Current Fuse melts the needed energy, its code is t, I read A2Sec. It is to make the fuse in 8 ms or a shorter period of time off. The product of the sum of squares of fusing time of the corresponding current, time limited within 8 ms is to make all the heat generated by the fuse is used to fuse to heat dissipation. It's different for each fuse components is a constant, it is one of the fuse itself parameters, determined by the design of fuse.