240 volt mains electrical appliance fuses for plug tops are available in the following ampage ratings.

1, 2, 3, 5, 7, 10 and 13amp.

 To ensure you are using the correct rating of fuse simply divide the total wattage of your appliance by 250 and round up to the closest value.

For example, a 1500 watt hair dryer should be fitted with a fuse equal to 1500 divided by 250 = 7amp

Fuses are there for your safety and should never be replaced by any other metal object or by a fuse that exceeds the recommended value.