A fuse is a protective device that protects electronic equipment from overcurrents of electricity and from serious injury caused by internal malfunctions. Therefore, each fuse has a rating specification, and the fuse will blow when the current exceeds the rating specification. The essence of fuse blowing: the current flows through the fuse to heat up the fuse, if the heat can not be dissipated in time, the fuse continues to heat up to reach the melting point after melting and disconnecting.

Specific reasons are mainly the following.

1. Overload

Household electricity load is too large, resulting in overload, so that the fuse blown. This situation is especially easy to appear when using air conditioners, electric heaters or increase other larger power appliances.

2.Pulse

When the circuit starts or the power supply is unstable, an instantaneous high current causes the fuse to break; in addition, the screws are not tightened when the fuse is installed, or the fuse is damaged, which can also cause the fuse to blow.

3. Poor contact

Some families, although the fuse selection is more reasonable, the load is not too large, but a use of air conditioners, electric heaters, rice cookers and other large power appliances, it will “trip”. The reason may be in the installation, replacement of fuses, fuses and plug screws in poor contact, resulting in ignition of heat, so that the porcelain plug, the gate on the screws to fix the fuse oxidation “burned”.

4. Short circuit

If the fuse is replaced,it trips as soon as it’s closed. , there may be a short circuit. First of all, the line is short-circuited. Secondly, the load is short-circuited, such as electric kettles, rice cookers and other commonly used larger power appliances and mobile appliances commonly used plug and poor quality appliances, are prone to short-circuit failure.

5. Aging

Fuse itself aging, use too long, long-term through the current, as we all know, the fuse also has a certain resistance, so through the current will be hot, will get thinner and thinner, the resistance will get bigger and bigger, and finally lead to burn out! In addition to the fuse in the long-term preservation due to friction, air slow oxidation and other reasons will also become thin.

Fuse failure solution

1. Circuit failure solution: check the circuit, find out the circuit failure section, whether the circuit is connected to the wrong circuit, circuit overload, wire aging and so on.

2. Fuse malfunction solution: Fuse failure, the circuit normal operation of the melting and circuit overload does not melt, these two situations, the former is the fuse may not be the appropriate rated current, rated voltage, replacement of the appropriate fuse can be. The latter is the fuse’s melting point is too large, need to replace the fuse with a lower melting point, specifically can compare the fuse’s rated voltage, rated current and the circuit’s rated voltage, rated current. Usually, the rated current of the fuse is 1.5 to 2 times the normal operation of the circuit.

3. Other abnormal fault solution: If there are other abnormal faults lead to circuit burnout, do not rush, first turn off the circuit mains or gate, step by step to analyze the cause of the failure, you can start from the circuit and the fuse to check. For safety reasons to do a good job of insulation measures, if you can not find the fault can contact a professional electrician to solve the problem.

The above is the cause of the fuse blowing and the solution. When designing and manufacturing fuses, we must carefully study the physical properties of the selected materials and ensure that they have a consistent geometry. This is because these factors play a vital role in the proper functioning of the fuse. Similarly, when using it, it is important to install it correctly.