Patch fuses can be divided into disposable patch fuses and patch self recovery fuses. After being protected by a disposable fuse, it needs to be replaced. After being protected by a self recovery fuse, it can be restored and reused after power failure. But what should we pay attention to when choosing patch fuses? The editor suggests selecting fuses based on the following aspects: normal current, fusing current, open circuit voltage, short circuit current, impulse current, and ambient temperature. Short circuit current: We refer to the maximum current that flows when a circuit is short circuited as the short circuit current. For various fuses, the rated breaking capacity is specified, and we must be careful not to exceed the rated breaking capacity when selecting fuses. If a fuse with a small breaking capacity is selected, it may cause the fuse to rupture or cause a fire. Impulse current: Observe the waveform of the impulse current (pulse current waveform) and calculate its ener
(1) With the demand for the development of electronic products, the functionality (integration) of ICs is also becoming stronger, and their "value" is naturally becoming more noble, so it is necessary to strengthen protection. (2) In order to reduce power consumption, reduce heat generation, and extend service life, the working voltage of semiconductor components and ICs is getting lower and lower. According to SIA (American Semiconductor Industry Association) statistics, the current working voltage is around 1.5V, and it will drop to below 1.2V by 2004. Therefore, its ability to withstand overcurrent/overvoltage needs to adapt to new protection requirements. (3) There are more and more mobile electronic products, such as handheld devices, PDAs, laptops, camcorders, digital cameras, jukeboxes, etc. These electronic products require battery components as power sources, and protective components must be equipped in both battery components and battery chargers. (4) In modern luxury
The first function of a patch fuse is protection, which means that when protection is needed, the patch fuse should play a role. This is also the first consideration when choosing a patch fuse. In general, the rated current of a fuse must be greater than the normal working current of the circuit and have a certain overload capacity. However, if the margin is too large, it will reduce or weaken its protective function. When a patch fuse should be activated, it should not act, causing damage to the protected components or even more serious dangerous consequences. The main reference tool for designers when selecting patch fuses is the "time current characteristic curve" in the product specifications provided by the fuse manufacturer. Choosing the appropriate type of SMD fuse with appropriate fusing characteristics and the appropriate rated current specification can meet the protection function of the fuse. The second function of SMD fuses is their load-bearing function, which is com
From a structural perspective, a self restoring fuse is composed of a polymer polymer, essentially a positive temperature coefficient thermistor. It provides circuit protection through the positive correlation between the resistance value of PTC material and temperature, as well as the sudden change at the Curie temperature point. It can be reused without frequent replacement; Disposable fuses are made of ordinary fuse materials, so they cannot be used again after each action and require frequent replacement. From the perspective of working action, they can all be used for overcurrent protection of circuit currents and can be interchanged in many occasions. For example, in battery protection applications where overcurrent protection requirements are not too high, these two types of products can both lead the way and can even be replaced, and most of the time, each has its own field. In the protection application of certain important devices such as ICs, or in the input/output ter
SMD self recovery fuse features: 1. Meet RoHS requirements 2. EIA size: 0805-2920 3. Maintain current range: 0.05-3.0A 4. The voltage level ranges from 6V to 60V, meeting the needs of computers and various electronic applications 5. Small pad size 6. Fast action time 7. Low impedance 8. Working voltage range: -40~+85 ℃ 9. Safety certification: UL/cUL/TUV 10. Small size, sturdy structure, and convenient for automated installation 11. With a wide variety and complete specifications, it can replace imported models such as Raychem, LITTLEFUSE, BOURNS, AEM, etc Application range of patch self recovery fuse: 1. Computers and peripheral devices 2. Mobile phone battery pack 3. Automotive Electronics 4. Power supply unit 5. Communication system
The application of self recovery fuses is becoming increasingly common, but when choosing self recovery fuses, we all want to know whether the speed at which the self recovery fuse starts protection is sufficient and timely when a fault current occurs in the circuit, in order to protect the circuit equipment. What I want to tell you here is that there are many models of self recovery fuses, and the starting protection speed varies among different models. And the time required for starting protection varies for the same model under different fault currents. (Related reading: Self recovery fuse response time) When discussing the duration of the self recovery fuse activation time, we can only provide a rough range, unless a specific model is specified, in order to provide a relatively accurate time value for the corresponding current value. The response time of the self recovery fuse protection action of the plug-in type is relatively longer than that of the patch fuse. The start-u
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