The Difference between Self Recovery Fuse and Blown Fuse

PublishTime： 2023-11-15 Article Source：XC News

In the circuit protection scheme, is it better to choose a self recovery fuse or a blown fuse for overcurrent protection? This issue has always been a serious issue that electronic security engineers must take seriously, and it is also one of the many questions that buyers consult with. In smart consumer electronics products (such as computers, smartphones, tablets, etc.), circuit protection design requires the use of self-healing fuses. If a blown fuse is used, it needs to be replaced every time abnormal overcurrent occurs, which is unacceptable to end users. In situations where safety needs to be prioritized or damage to other downstream circuit equipment needs to be avoided, it is better to choose a fused fuse. In case of a fault, completely cutting off the current is beneficial for fault diagnosis.

So, what is the difference between a self restoring fuse and a blown fuse? It is inevitable to have a clear understanding of the functions, parameters, and differences between them. So, let's experience the charm of self recovery fuses and blown fuses.

1、 Common ground

Self-recovery fuses and blown fuses can both serve as overcurrent protection in circuits, both of which are achieved through the heating phenomenon generated by the current in the circuit. A self restoring fuse changes from a low resistance state to a high resistance state to limit the size of the current, while a blown fuse disconnects the current by blowing.

2、 Differentiation points

1) Self recovery: There is a significant difference between the two, as the self recovery fuse has the characteristic of automatic recovery, which can greatly reduce maintenance and service costs; However, if a fuse is blown, it has no recovery characteristics and must be replaced in the event of a malfunction.

2) Leakage current: The occurrence of leakage current in the self recovery fuse; when a fuse is blown, the leakage current is zero, which has extremely high reliability performance;

3) Sensitivity: A blown fuse is highly sensitive to current and can quickly fuse, And the self recovery fuse is relatively low;

4) Response speed: The action time of a blown fuse is faster than that of a self restoring fuse;

5) Safety: From the differences in various aspects between the two, it can be seen that in terms of safety, the safety and reliability of a blown fuse are higher than that of a self restoring fuse;

6) Internal resistance: The internal resistance of the two is different. The internal resistance of a blown fuse is relatively small, while the internal resistance of a self restoring fuse is relatively large;

Fig.1

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