One interesting difference between UL and IEC standards for fuses is that American UL standards often state a requirement for a fuse to withstand 100% or 110% rated current for a minimum of 4 hours. This means that the fuse is allowed to fail after 4 hours at its rated current.
IEC60127
IEC60127 is a set of European standards for fuses. There can be some confusion about this standard as its often unclear if a fuse used in a particular application is required to comply. It is not the case that all fuses used in equipment sold in the European Union must comply with IEC60127.Many applications do require compliance and as a general guide its applications where the voltage is AC and >50V where compliance is required, but this is not exclusively the case.
