1、 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) Coefficent, also known as a self restoring fuse. Strictly speaking, PPTC is not a self restoring fuse, and Resettable Fuse is a self restoring fuse. 2、 Principle of self recovery fuse The self recovery fuse is made of high-tech polymer resin and nano conductive grains through special processing. Under normal circumstances, nano conductive grains The body forms a chain like conductive path along with the resin based link, and the fuse operates normally; When a circuit experiences a short circuit or overload, the large current flowing through the fuse causes its temperature to increase. When the Curie temperature is reache
IH: Maximum working current (25 ℃) IT: Minimum operating current (25 ℃) Itrip: Overload current Tmax: Maximum action time of overload current Vmax: Maximum overload voltage Imax: Maximum overload current Rmin: minimum resistance (25 ℃) Rmax: Maximum resistance (25 ℃) Self recovery fuse application The self recovery fuse is connected in series in the DC/AC power circuit. DIP direct insertion or SMD surface mount can be selected PPTC has no positive or negative polarity. As PPTC is in a protected state and has a high surface temperature, it should be installed in a ventilated state. High temperature sensitive components should not come into direct contact with PPTC Application scope: Application of Self Recovery Fuses in ADSL Devices Application of Self Recovery Fuses in Radio Products, Battery Packs, and Charger Products Overcurrent Protection in Automotive Electronics and Components Application of remote control electric toy cars, high-frequency and low-frequency power
In many electronic devices, fuses are indispensable. Since Edison invented the first plug-in fuse in the 1890s, which enclosed thin wires in a lamp holder, the types of fuses have become more and more diverse, and their applications have become more and more widespread. Here are some common knowledge on fuse parameters, selection, and application. The rated values and performance indicators of fuses are determined based on laboratory conditions and acceptance specifications. There are multiple authoritative testing and appraisal institutions internationally, such as UL certification from Underwriters Laboratories in the United States, CSA certification from the Canadian Standards Association, MTTI certification from the Japan Department of International Trade and Industry, and ICE certification from the International Electrotechnical Commission. The selection of fuses involves the following factors: 1. Normal operating current. 2. The applied voltage applied to the fuse. 3. Abnorma
We all know that when current flows through a conductor, it will generate heat due to the presence of a certain resistance in the conductor. And the calorific value follows this formula: Q=0.24I2RT; Where Q is the heat generated, 0.24 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, and T is the time for the current to flow through the conductor; Based on this formula, we can easily see the simple working principle of a fuse. When the material and shape of the fuse are determined, its resistance R is relatively determined (without considering its resistance temperature coefficient). When an electric current flows through it, it generates heat, and as time increases, its heat also increases. The magnitude of current and resistance determines the rate of heat generation, while the construction and installation of a fuse determine the rate of heat dissipation. If the rate of heat generation is less than the rate of heat dissipation,
There are two optional types of self recovery fuses and disposable fuses available for surface mounting. Both self recovery fuses and disposable fuses can respond to excessive current, but the "self recovery" device of self recovery fuses, based on polymer components, can automatically reset after overload disappears, achieving multiple overcurrent circuit protection. When a conductive polymer is heated by an overload current, its resistance will increase, thereby limiting the circuit current. The advantages are more prominent in many products. However, it is not possible to replace disposable fuses with self restoring fuses. Both have their own advantages and disadvantages. In terms of overload protection for circuits, the two do not have the best products. Only by fully understanding the performance differences between the two types of fuses can we make easier choices when choosing the optimal circuit protection scheme. Then, based on the specific working conditions of the circui
When an overload occurs, a disposable fuse will blow at once. Although it can provide overcurrent protection, it needs to be replaced. The core part of a conventional fuse is a section of wire, which is heated to the melting point when the current is too high. After the wire melts, the current in the circuit drops to zero. So in some circuits that require complete power outage, or products with higher risk factors such as machinery, it is more suitable to use disposable fuses, which has a higher safety factor when used. Both traditional disposable fuses and self restoring fuses can achieve overcurrent circuit protection. Both achieve protection by reacting to the heating phenomenon generated by excessive current in the circuit. Fuses break the current by blowing, while self restoring fuses rely on changing from a low resistance state to a high resistance state to limit the magnitude of the current.
MB:+86 13924633629 Ms.vicky
E-mail: waimao@xcfuse.com
Factory :
XC Electronics(Shenzhen)Corp.,LTD
Add: Jinyuan Industrial zone,Heao, Henggang, Shenzhen 518115,China
Shenzhen branch: Shenzhen Xucheng Electronic Commerce co.Ltd
Add: 8-15 Jinyuan Industrial zone,Heao, Henggang, Shenzhen 518115,China
