How can you find out what the UL rating would be for an IEC rated fuse (i.e. How can you convert the IEC rating to UL)?
The standard way to do this is to multiply the IEC rating by 1.43 times. This is a good approximation to the UL rating. It gets the customer in the ballpark. The conversion factor is applied to either the UL or IEC fuse rating to arrive at the other rating. The formula is 1.43 X (IEC rating) = (UL rating)