The melting point and the breaking value of a fuse are two different concepts, which describe the temperature at which a fuse will blow and the maximum current value it can withstand respectively. When selecting and using fuses, these two parameters and their influencing factors need to be fully considered to ensure the safe and stable operation of the circuit.

First. Melting point of fuse

The melting point of the fuse is the temperature at which the fuse cuts off the current by its own melting when the current rises abnormally to a certain height and heat. The melting point of a fuse is usually low in order to protect circuits and equipment by blowing quickly when the current is too high. The melting point of a fuse is affected by a variety of factors such as material, construction, and ambient temperature.

In household circuits and industrial circuits, fuses protect circuits and equipment by their melting point characteristics, automatically blowing when the current is abnormal.

Second.Melting value of fuse

The melting value of a fuse usually refers to the maximum current value that the fuse can withstand, when the current exceeds this value, the fuse will blow. However, it should be noted that the “melting value” is not a strict physical term, the more common expression is “rated current” or “melting current”.

Another parameter associated with the blowing of a fuse is the I²t value (amperes squared in seconds), which is the square of the product of the current and time that the fuse can withstand before blowing. The higher this value, the less likely the fuse is to blow unexpectedly when subjected to an instantaneous overcurrent event.

The fuse’s blowing value (or current rating) is an important parameter of a fuse that determines at what current the fuse will blow. The blowing value of a fuse is affected by a variety of factors such as material, construction, ambient temperature, etc., and usually has a certain margin of error.

When selecting a fuse, it is necessary to choose the appropriate melting value (or rated current) according to the rated current of the circuit and the maximum current that may occur to ensure that the circuit can be protected in a timely manner in the event of an overload or short-circuit.

Third.The difference between the melting point and the Melting value

Definition is different:
The melting point is the temperature of the fuse when it melts.
Fusing value (or rated current) is the maximum current value that the fuse can withstand.

Different influencing factors:
The melting point is mainly affected by the fuse material, structure, ambient temperature and other factors.
The melting value (or rated current) is affected by the fuse material, structure, ambient temperature, as well as the current waveform, duration and other factors.

Different applications:
The melting point is mainly used to describe the temperature at which a fuse will blow, and is an indication of the material properties of the fuse.
The melting value (or current rating) is used when selecting fuses to ensure that circuits are protected in a timely manner in the event of an overload or short circuit.