In the 1880s, inventor Edison applied for a patent for a fuse equivalent to a safety switch in a circuit. After a long time, different types of fuse links have been produced. The standards formulated by the International Electrotechnical Commission (IEC) define it as a “fuse link“.
The earliest fuses were used to protect expensive electric lamps.
In the industrial technology environment more than 100 years ago, electric lamps could only last for a short time and were very expensive, and Edison made more than 1,600 heat-resistant materials and more than 600 kinds of plant fibers.
Experiment to create a carbon filament light bulb. After continuous improvement, the use of tungsten as a filament was developed as a fuse for protecting electric lamps.
Its original purpose is to protect important electrical components. When the circuit fails, the current will increase abnormally, which may damage important components in the circuit and may also cause a fire.
However, a link fuse is installed in the circuit. When the current rises abnormally, the fused link will blow and cut off the current, which can protect the safe operation of the circuit.
There are many fuse link type, the common plug-in type carrier fuse link, screw-type cartridge fuse link, closed type ceramic fuse link, fast, self-reset cut out fuse link, the plug-in type fuse is commonly used in circuits of 380V and below, the screw-type hrc fuse link is used in circuits of 500V/200A and below, and the closed type fuse link cut out is generally used.
They are all square ceramic tubes filled with quartz sand for arc extinguishing. They are used in circuits below 500V/1KA.
The structure of the fast type fuse is similar to that of the closed type fuse link electrical, but the material of the melt is different, and silver flakes are used. of the melt.
The self-recovery type uses sodium as the melt. When the short circuit generates a high temperature, the sodium will vaporize.
The gaseous sodium can limit the current of the short circuit, and the temperature drops. The metal sodium has good electrical conductivity and can be reused.
People often think that the voltage and current are the same, they can be replaced, but this concept is wrong.
Believe it or not, an article wrote that the motor fuse of refrigeration equipment burned out, and it said 16a fuse link, so I found another 16a lv hrc fuse link and replaced it.
Just turned on the equipment and it burned out. This is because the fuse is protected by the protection The form can be divided into the well-known overcurrent protection and the overheat protection affected by temperature factors.
The voltage and currents are the same, and the current of the refrigeration equipment is 5-7 times the rated current when it is electrically turned on, so it will burn so quickly.
Fuse link types can also be divided into ultra-slow fuse, slow, medium-speed fuse, fast fuse, ultra-fast, etc. according to the fusing speed.
The fault current of the circuit in which the fuse link is placed must be less than the rated breaking current specified in the standard, otherwise ignition, fire, and other phenomena. Choose an inferior fuse link, its breaking capacity is not up to the standard, it will cause the failure to cut off the fault current and cause fire and other hazards.
Although the fuse is one-time and has a single function, its current limiting breaking capacity is high and the price is cheap.
GRL is a professional fuse link manufacturer, producing cut-out fuse links, cylindrical fuse links, solid fuse links, square pipe fuse links with knife contacts, Hrc fuse links, NH fuse links, trame fuse links, miniature fuse links, etc.
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