How to choose self recovery fuse and traditional fuse?

时间:2019-04-17 丨 预览:117 人次

In life, some products are suitable for use with self-recovery fuses, while others are suitable for use with traditional fuses. Whether you choose traditional fuses or self-recovery fuses, it depends on the specific product circuit. benefit.

For example, many designs of computers, peripherals, and portable devices require the use of resettable fuses because the resettable fuses can reset themselves. If traditional fuses are used, they must be replaced every time an overcurrent occurs, which is unacceptable to users.

In other cases, it may be better to use a traditional fuse because the fuse can completely cut off the current under fault conditions. This may be a more ideal choice when safety needs to be prioritized or damage to downstream circuit equipment needs to be avoided. The use of fuses is also very useful for fault diagnosis. It can help device designers and users to find the source of overcurrent faults.

Overcurrent circuit protection


Faced with the issue of providing overcurrent protection, circuit designers have the right to choose the technology used. Traditional fuses and polymer-based resettable fuse devices are the most conventional solutions. If you can understand the difference between these two components, you can simplify the process of selecting the best application protection device.

The fuse has always been regarded as a "disposable" device, because when an overload occurs, the fuse will be blown at one time, thereby providing overcurrent protection, and it must be replaced later. The core part of the conventional fuse is a piece of wire, when the current is too large, the wire will be heated to the melting point. After the wire is blown, the current in the circuit drops to zero.

PTC can also respond to excessive current, but it is a "self-recovery" device. Polymer-based components can be automatically reset after the overload disappears, which can realize multiple overcurrent circuit protection. When the conductive polymer is heated by an overload current, its resistance will increase, thereby limiting the circuit current.


Therefore, whether to choose a traditional fuse or a self-recovery fuse, this should be selected according to the specific product circuit, because the respective uses are roughly the same, but the function is different.