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Fuses

0034.6812 application field and working principle

Fuses are used as an important component of many electrical systems and installations, such as telephone lines, HVAC systems, outdoor floodlights and industrial systems. Fuses offer electrical circuit protection from dangerous electrical surges and overloading. Understanding the application fields and working principles of fuses helps ensure the safety of workers and the general public.

Application Fields

When the current in the circuit exceeds the rated current of a fuse, the fuse element melts, effectively breaking the circuit and preventing overcurrents from damaging other electrical components. Fuses are mainly divided into three categories: cartridge fuse, wall plug fuse and metal film fuse.

The cartridge fuse is composed of a fixed body and a replaceable fuse element. The fixed body and the connecting wires are made of brass or copper. Fuses of this type are widely used in industrial systems, such as high-power electric motors and transformers, and are also used in some electrical components, such as relays, contactors, and inverters.

The wall plug fuse is also composed of a fixed body and a replaceable fuse element. The outer shell is often made of plastic. This type of fuse is used in the protective circuit of low-power electrical systems, such as household appliances, televisions, computers, and other electronic products.

Metal film fuses are composed of a metal upper cover and a lower fuse element. The contact parts of the electric appliance are all copper, with excellent thermal and electrical conductivity. This type of fuse is mainly used in the power cord and power circuit of integrated circuit boards, providing protection to IC components.

Working Principle

The working principle of a fuse is relatively simple. The fuse element is made up of a special alloy wire or strip with a certain melting point. When the current in the circuit exceeds the rated current, a certain amount of heat is generated, which increases the temperature of the fuse element. When the temperature of the fuse element reaches the melting point, the fuse element melts and the circuit is interrupted.

The melting point of the fuse element is related to the current in the circuit. The more current flowing through the circuit, the higher the temperature of the element and the faster it melts. Different fuse elements have different melting points, and therefore the current protection requirements of the circuit should be taken into account when choosing the fuse.

Features

The features of the fuse lie in its simple structure, low cost, and easy replacement. In addition, a variety of special fuse devices provide unique protection for more complex circuits. When using fuses, it is important to select the appropriate fuse for the circuit. The rated current should be selected according to the time constant characteristics rarely used in the circuit. When the fuse is activated, personnel should be responsible for inspecting and replacing the fuse element to ensure the safety of personnel and equipment.

Conclusion

The 0034.6812 fuse is a type of fuse that is widely used in various types of electrical systems. It is composed of a metal upper cover and a lower fuse element, and it works by melting when the current in the circuit exceeds its rated current. This melting causes the circuit to be interrupted, thereby preventing overcurrents from damaging other components. It is important to select an appropriate fuse for the circuit, and when it is activated, personnel should beresponsible for inspecting and replacing the fuse element.

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