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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 If replacing a blown fuse in a manufacturer-designed (factory) application, e.g. in a vehicle fuse panel, then the same type and rating of fuse should be used. If a fuse continues to blow then there must be a fault with the circuit and a higher rating fuse should never be fitted to overcome this, even temporarily. Doing this creates a high risk of component failure and electrical fire. The calculation would be 2200 Watts divided by 240 Volts equalling 9.17 A +10% which equals 10.087 amp. So from this calculation the ideal fuse would be a fuse of around 10 A amp. 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!" In an ideal world each individual section of positive cable would be fused as this would provide the most protection and make fault finding relatively straight forward, because it would allow you to narrow down the problem to a single section of cable (i.e. where the fuse has blown). Having said that this is ideal it is nearly always impractical as it would lead to many fuses fitted throughout an electrical system. A good compromise is that every individual circuit should be fused as this provides a good degree of protection andat least allows you to narrow down the problem to one circuit.
Most UK plugs are fitted with a 3 amp or 13 amp fuse. 3 amp fuses are used with a range of lower power domestic goods and tools, including lamps, TVs, and drills. Meanwhile, higher power goods such as washing machines, kettles and toasters normally require a 13 amp fuse. What Happens When a Fuse Blows?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
Kettles have a wide range of wattages depending on if it is a slow boiling kettle, or a rapid boiling kettle. It is important to note that the section of cable coming from the battery +ve terminal to the first fuse (or battery distribution box) is effectively an unprotected part of the circuit. If there is a short anywhere along this length then it is very likely to catch fire as the first fuse will not experience the excess current. For this reason the length of cable from the battery +ve to the first fuse should be as short as possible so that damage is minimised in the event of an electrical fire. Switch fuse units distribute current while shielding cables and devices from the damage that would be caused by power fluctuations along a particular electrical circuit. Switch fuse units are used in industrial and commercial buildings as well as domestic properties. 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? Fast Acting Fuses: these are a more general-purpose fuse typically used with cabling and sturdier components. They are also known as Fast Blow or F-Type fusesThe simple calculation is watts divided by volts equals amps. After you have calculated this, it is a simple case of adding around 10% to the value and choosing the nearest fuse to match. This is a more precise method then just guessing should you require a 3, 5, or even 13 amp fuse. Replacing the incorrect fuse with the correct one will avoid the risk of you blowing the fuse. If the fuse is working correctly, this means the problem does not lie with the fuse. If the fuse has blown or is not working correctly, it will need to be replaced Once you have replaced any necessary powerpoint fuses, locate your fuse box, using your torch if necessary. Ensure that the master switch is in the off position. It should be following a trip, but you should always make sure that this is the case As modern day living has progressed and technology improves, lightbulbs are changing over to LED. A lot of the LED lightbulbs are 5 W (that’s one 20 th of a hundred watt lightbulb) so a calculation for this would be: Fuse boxes can essentially be explained as control panels for the electrical system in a particular location. They are the location at which incoming power is divided into separate circuits. Typically, they feature a central switch controlling:
Fuse boxes have a number of alternative names, including control board panels, distribution boards, breaker panels, fuse boards, and fuse panels. Domestic fuse boxes are frequently referred to as consumer units. What is a Switch Fuse Unit? There are multiple different types of automotive fuses. Varying types and sizes will be needed for dealing with specific electrical equipment within the vehicle. For this reason, it is common for a single car to include many different types of fuses. The majority of the time there is no identification plate on the table lamp, however we know that the maximum lightbulb wattage is going to be 100 W, so the calculation would be: The rating of fuse fitted within a plug depends on the power rating of the device to which it is attached. The fuse must be compatible with currents slightly higher than those used to operate the device. The time taken for a particular type of fuse to blow is called the fuse speed. The three principal fuse speeds available are:If the appliance shows 60 Hz, then this appliance is not suitable for use within the UK. If the appliance shows 50–60 Hz it is suitable for the dual use (Europe/UK). 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. 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. There are some instances where fuses are not normally used and one example is for the, normally short, length of cable from the battery to the starter motor. Starter motors are normally the highest current draw electrical item on a vehicle as they have to crank the engine, and the current can reach several hundred Amps, especially with large diesel engines that have a high compression ratio. For this reason it is usually deemed impractical to fuse this length of cable, although some vehicles do have fusible links which are simply a small section of lower current rating cable encased in a fireproof sleeve. They are installed with the cable being protected and are designed to melt and break the circuit in an over-current condition. The other reason for not fusing the starter circuit is that if the battery is disconnected from the alternator whilst it is turning (as would be the case if a fuse blew) the diodes in the alternator's rectifier can be damaged.
The following chart outlines the blade fuse colour coding system and the corresponding amperage rating:
Halfords Blade Fuses 7.5 Amp (FUSE185)
A Type C fuse is actually a type of miniature circuit breaker (MCB). MCBs are a type of circuit breaker used with lower-powered circuits to cut off current in the event of an overload. Type C fuses trip circuits when the current exceeds the rated one by between five and ten times - i.e. at 100-500 amps for a 20amp device. Type D Fuses Despite their everyday name, domestic fuse boxes now typically contain circuit breakers rather than fuses, and they are more formally known as consumer panels. However, if your property still contains a traditional model, here is how to go about changing the wire in a fuse if it blows and cuts the power to one of the circuits that run through the building. 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. When specifying a fuse for an after-market application, the key consideration is that the fuse should be the weakest point (i.e. lowest rated component) so that it always blows before any damage occurs to other parts of the electrical circuit. However, you also do not want the fuse to keep blowing under normal operation (known as a nuisance blow), so the two elements to consider are:
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