What is the function of a fuse for overload protection or short circuit protection

When it comes to fuses, you may not be familiar with them, but everyone should know the common name for fuses, which is fuse. It is a commonly used protective device in distribution systems, control systems, and electrical equipment. So what is the use of fuses?

The main function of a fuse is to protect the safe operation of the circuit and prevent accidents such as burning out the circuit, burning out components, and fire from occurring due to the sharp increase in current in the circuit and the rise in wire temperature Is the function of a fuse overload protection or short circuit protection

There are two common faults in circuits: overload and short circuit. There are also overload protection devices and short circuit protection devices used to protect the circuit. So what is the protection of a fuse?

Generally speaking, fuses are mainly used for short circuit protection and severe overload protection, because fuses require a high current in the circuit, causing the temperature to rise to the melting temperature of the fuse melt before breaking. The general overload current is much lower than the melting current, and even if an overload occurs, the fuse will not melt. Therefore, fuses are generally less used for overload protection, and are mainly used as short circuit protection devices.

Can fuses provide overload protection

Generally not recommended.

The melting of the fuse can only play a role in breaking the current, and the melting time of the melt decreases with the increase of the current. Simply put, the larger the current passing through the melt, the shorter the melting time; However, the fuse melt is not sensitive to overload response. When electrical equipment experiences mild overload, the melt will last for a long time before melting, sometimes even not melting. Therefore, except in lighting circuits, fuses are generally not suitable for overload protection.