2040.0712

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Introduction of Fuse

A fuse is a device used in an electrical circuit to protect it from excessive currents. It is a one-time device that must be replaced after it has operated. Fuses are designed to open an electrical circuit if the current passing through it exceeds a certain limit. When the circuit is overloaded, the fuse element forms an electric arc, which creates enough heat to melt the metal, interrupting the flow of current.

2040.0712 Application Field and Working Principle

Fuses can be used in a wide range of applications, such as automobiles, home appliances, industrial equipment, etc. Generally speaking, the purpose of the fuse is to cut off the circuit when a short circuit or over-current occurs. Fuses can be categorized into two types: replaceable and non-replaceable. Replaceable fuses are generally used in home appliances, industrial equipment, automobiles and other places, which can be added or replaced after the fuse is blown. Non-replaceable fuses are generally used in high-voltage or high-current circuits, and they are not easy to be replaced.

The working principle of the fuse is based on the Joule heating heat releasing when electric current passes through it. Current will flow uninterruptedly through the fuse when it is in good condition, and the resistance of the fuse wire is much smaller than that of the circuit. When overload current flows through the fuse, the heat generated by the Joule heating will cause the metal wire to melt and evaporate quickly, forming an arc that instantly interrupts the circuit, thus protecting the circuit.

Different Types of Fuse

Fuses can be divided into different types according to their material, application, size, structure and other aspects. Commonly used materials for fuse include ceramics, metals, materials such as glass, rubber and plastics, as well as organic compounds such as sulfur and oil.

Cylindrical fuses often have a cylindrical casing made of metal or glass, containing a wire or strip fuse element. The fuse usually breaks in two when it trips, leaving a broken wire or strip in the casing. This type of fuse is mainly used in residential and other low voltage applications.

Another type of fuse is cartridge fuses, which uses two metal wires crimped together using crimping technology. Cartridges are usually made up of two metal parts, one of which is the fuse element and the other is the contact. This type of fuse is mainly used in power supplies and other high voltage applications.

Blade fuses are also used in automotive applications. This type of fuse is made of plastic with metal blades on both ends. The blade and the contact are connected to a circuit, and when the current is over a certain limit, the blade will melt, thus cutting off the circuit.

Time-delay fuses are also known as slow-blow fuses. These fuses are designed to allow a certain amount of current to pass before tripping and are used in applications requiring a higher current level for a delay period.

Conclusion

Fuses are an important part of electrical safety and protection systems. They are used in a variety of applications, from homes to automobiles to industrial equipment, to protect these systems from excessive current damage or over-current. Different types of fuses have different characteristics, and the types of fuse should be selected according to the environment and application.

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