More than Amps: If fuses are rated for amps, why are fuses also labeled with a voltage rating?
This is because not all fuses will work properly with the same voltage. For example a small 1/4" x 11/4" glass fuse rated at 20 amps may work well in a 24-volt control circuit, but if the same fuse was used in a 250-volt application it could shatter and blow glass fragments into the users eyes. A ceramic rather than a glass fuse is recommended for the higher voltage in most applications. Before installing a fuse, check the fuse to see how many volts it is rated for.