This is taken from the Littlefuse Electronic Designers Guide.
VOLTAGE RATING: The voltage rating, as marked on a fuse, indicates that the fuse can be relied upon to safely interrupt its rated short circuit current an a circuit where the voltage is equal to, or less than, its rated voltage. This system of voltage rating is covered by N.E.C. regulations and is a requirement of Underwriter Laboratories as protection against fire risk. The standard voltage ratings used by fuse manufactures for most small-dimension and miget fuses are 32,125,250 and 600.
In electronic equipment with relatively low output power supplies, with circuit impedance limiting short circuit currents to values of less than ten times the current rating of the fuse, it common practice to specify fuses with 125 or 250 volt ratings for secondary circuit protection of 500 volts or higher.
As mentioned previously (See DERATING), fuse are sensitive to changes in current, not voltage, maintaining their "status quo" at any voltage from zero to the maximim rating of a fuse. It is not until the fuse wire melts and arcing occurs that the circuit voltage and available power become an issue. The safe interruption of the circuit, as it relates to circuit voltage and available power, is discussed in the section on INTERRUPTING RATING.
To summarize, a fuse may be use at any voltage that is less than is voltage rating without detriment to its fusing characteristics. It may also be used at voltages higher than its certified voltage rating if the maximum power level available at the fuse under a "dead short" condition can only produce a low-energy non-destructive arc.
Based on the above I still maintain one should be aware of the fuse voltage rating.