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Current is measured in Amperes, abbreviated to Amps or just the letter A. Because of the low-current nature of the products at Oznium, most of the products, and the table that I’ve developed, have current listed in milliamperes or mA for short.
Fuses and circuit breakers serve a very similar function - both break electrical circuits in the event of a current surge or short circuit. However, there is a crucial difference. Circuit breakers are switches, and like all switches, they can be reset once they have been flipped. Most fuses, though, can only be used a single time. Once they have blown, they must be replaced. They are, by definition, a weak link - entirely by design. One common misconception about choosing the correct fuse size is that it’s dependent on the load of the circuit. Actually, the load of the circuit should have nothing to do with choosing a fuse size. The fuse size should be based on the SMALLEST wire (largest gage number) in the circuit. I have a pre-fitted moulded plug on my appliance and there is no fuse? I have no idea what type or fuse rating I require!" When a fuse blows, the electrical supply to a particular circuit is immediately cut off. This lowers the risk of fire and prevents damage to the wiring. The blown fuse can safely be replaced without the risk of electrocution. Are Old Fuse Boxes Illegal?The time taken for a particular type of fuse to blow is called the fuse speed. The three principal fuse speeds available are:
If you find that you have a three amp fuse in the fuse spur feeding down to your appliance, and using the calculations above, you have a requirement for 13 amp fuse, then the fuse in the fuse spur needs to be upgraded to the 13 amp fuse. For example, if an electric drill requiring a new fuse has a 700-watt rating, divide this by 230 (the standard UK mains voltage). The result is 3.04, so you will require a 3A amp fuse for the plug. Where Would a Type D Fuse Be Installed? However a 13 amp fuse would be fitted as standard into the plug by the manufacturer, any fuse lower than even the 10 amp would fail. Be warned, if you are tempted to use something like a paperclip or piece of tinfoil wrapped around an old fuse or a nail, don’t. It is extremely dangerous and could result in electrocution, a fire or total failure of your appliance.
The technical reference for a UK plug is BS 1362.
Ultra-rapid fuses: typically used in sensitive circuitry and transistors to protect against short circuits, reacting almost instantaneously. These are also known as Very Fast Acting, Super Rapid and High-Speed fuses Slow Acting fuses include a delay mechanism that allows short, lower power electrical surges to pass through the circuit without the fuse blowing. They are also known as Slow Blow or Time Delay fuses. Dual Element fuses feature a higher performance delay mechanism Unsurprisingly for such a widely used component, fuses are available in a multitude of models and voltage capacities for use in different industrial, manufacturing and electronic settings.
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