1. What is a current fuse
Current fuse is an electronic component to protect electrical appliances. It is usually connected in series in a circuit. When the fault current increases to a certain value, it fuses itself and cuts off the circuit to protect other devices in the circuit. The most commonly used in circuit overcurrent protection components is the current fuse. Traditional current fuses are mainly composed of a tube body with metal connection terminals at both ends and a metal melt in the tube. Most current fuses have a cylindrical shape, which is a so-called tubular structure. However, with the rapid development of high technology today, some special materials have been well applied. The current fuse industry has begun to develop in the direction of product miniaturization, and a series of new products such as chip fuses and surface mount current fuses have appeared.
Second, the structure of current fuse
Generally, a current fuse is composed of three parts: one is the melt part, which is the core of the current fuse. It cuts off the circuit when it is blown. The resistance value should be as small as possible and consistent. The most important thing is that the fusing characteristics should be consistent; The second is the electrode part, usually there are two. It is an important part of the connection between the melt and the circuit. It must have good electrical conductivity and should not produce obvious installation contact resistance; the third is the bracket part. The melt of the current fuse is generally Slender and soft, the role of the bracket is to fix the melt and make the three parts a rigid whole for easy installation and use. It must have good mechanical strength, insulation, heat resistance and flame retardancy, and should not be used during use. Phenomena such as fracture, deformation, burning and short circuit will occur.
Three, the role of current fuse
1. The current fuse can withstand a certain range of overload when the current fluctuates due to power supply or external interference.
2. When there is a large overload current in the circuit, the current fuse should cut off the overload current within the specified time to protect the safety of other electronic components in the circuit.
3. When a short circuit occurs in the circuit and there is a large current, the current fuse can safely cut off the circuit to prevent them from being damaged due to overcurrent. (Recommended reading: Introduction of littelfuse brand fuses)
Fourth, the classification of fuses
According to the form of protection, it can be divided into: the fuse used for over-current protection is the usual fuse (also called current fuse). The fuse used for overheating protection is generally called "thermal fuse".
According to the scope of use, it can be divided into: electronic and electrical fuses, power fuses, automobile fuses, etc.
According to the volume can be divided into: large, medium, small and micro.
According to the rated voltage, it can be divided into: high voltage fuse, low voltage fuse and safety voltage fuse.
According to the shape, it can be divided into: flat head tubular fuse, pointed tubular fuse, guillotine type fuse, spiral type fuse, blade type fuse, flat type fuse, and chip type fuse.
According to the fusing speed, it can be divided into: slow blow fuse, generally represented by T; fast blow fuse, generally represented by F.
According to the standard, it can be divided into: European standard fuse, American standard fuse, Japanese standard fuse and so on.
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