The Difference between Self Recovery Fuse and Blown Fuse
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;
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Temperature Characteristics of Current Fuses
Current fuses exhibit specific temperature characteristics that play a crucial role in their performance and reliability. The behavior of a current fuse in response to temperature changes is determined by several factors.
Explanation of Parameters in the PPTC Specification for Self Healing Fuses
This is very simple. As long as you know the meaning represented by the parameters in the specification book, you can clearly and quickly view the PTC specification book for self recovery fuses.
Calculation Method for Melt Current of Fuse Fuses
The current of a fuse includes two aspects, one is the rated current of the fuse tube, and the other is the rated current of the melt, which cannot be confused.
Self Recovery Performance and Working Process of Self Recovery Fuses
Traditional fuses are installed in circuits. When an overcurrent occurs due to a fault or abnormality in the circuit, the fuse itself melts to cut off the current and protect the circuit. However, due to the fact that traditional fuses can only protect once and need to be replaced if burned out, some products still cannot resume operation after troubleshooting or abnormal overcurrent disappears. As a new type of overcurrent protection device, the self-recovery fuse has the function of automatic recovery, which can meet the performance requirements of similar applications.
Encapsulation Forms of Current Fuses
The encapsulation of current fuses is an important aspect that affects their performance, durability, and safety.
The Installation Precautions for Current Fuses
The installation of current fuses is crucial for ensuring the safety and proper functioning of electrical circuits. Here are some important installation precautions to keep in mind.
What is A Self Recovery Fuse
Self recovery fuse is an overcurrent electronic protection component that uses a polymer organic polymer under high pressure, high temperature, and sulfurization reaction conditions.After mixing with conductive particle materials, it is processed through a special process. Habitually applying PPTC (Polymer Positive Temperature).
Several Factors Influence the Lifetime of Current Fuses
The lifetime of a current fuse is influenced by several factors. Firstly, the current rating of the fuse plays a crucial role. If a fuse is constantly operating near or at its rated current, it will experience more heat buildup and stress over time, which can shorten its lifetime.
Precautions for Using Fuses
The fuse is connected in series with the circuit, installed vertically, and installed on each phase line； Fuses are not allowed to be installed on the neutral line of a two phase three wire or three-phase four wire circuit.The power input terminal of the spiral fuse should be connected to the center point of the base, and the output wire should be connected to the threaded shell； This insurance is used in places with vibrations.
Common Sense for Fuses
A fuse refers to a self destructing fuse that experiences significant surges or other current exceeding limits in a circuit； In order to protect the components of other parts of the circuit where the fuse is located and the equipment is normal, the cost of replacing the fuse can be ignored compared to replacing the entire circuit that may be damaged. Due to the fact that fuses are a common element that needs to be replaced, we will introduce two basic concepts and provide a more in-depth introduction to fusion applications and testing and diagnostic methods.
Guide to Current Fuse Selection
Selecting the appropriate current fuse is crucial for the safety and efficient operation of an electrical system. Firstly, one must consider the rated current of the circuit. The rated current of the fuse should be slightly higher than the normal operating current of the circuit. For example, if a circuit typically operates at 5 amperes, a fuse with a rated current of around 5 - 7 amperes might be suitable. However, it should not be too high, as this may lead to a situation where the fuse does not blow when it should during an overload or short - circuit.
Precautions for Selecting Chip Fuses
With the development of highly integrated electronic products such as digital cameras, laptops, and smartphones, and urgent need for factories to adopt full automation to reduce high labor costs in the market environment. Chip fuses are widely used in overcurrent protection applications, but due to differences in technology, they have different advantages compared to plug-in self-recovery fuses. At the same time, chip fuses also have some of their own weaknesses.
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As is well known, the interface of intelligent instruments was originally RS232, which can achieve point-to-point communication, but this method cannot achieve networking function. The subsequent RS485 resolved this issue. So the current RS485 interface is quite popular among intelligent instruments. Today, the editor will explain the application of self recovery fuses in the RS485 interface.
Principle and Characteristics of Self Recovering Fuses
As a new type of overcurrent protection component, self recovering fuses have the advantages of self recovery, fast response speed, and small size, and have broad application prospects in electronic devices and circuits.
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