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November 08,2023

fast blow or slow blow fuse for amplifier.Technical standards for fuses

　　　　1. Rated zero power resistance　　PPTC thermistors should be packaged according to zero power resistance levels, and the resistance range should be indicated on the outer packaging. After the withstand voltage and current resistance tests, the change rate of the resistance before each group of samples is extremely poor δ| After Ri - Before Ri - (After Rj - Before Rj)/Before Rj | ≤ 100%　　2. PTC effect　　A material has a PTC (Positive Temperature Coefficient) effect, which means that the resistance of the material increases with increasing temperature. Most metal materials have the PTC effect. In these materials, the PTC effect is manifested as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear PTC effect.　　3. Nonlinear PTC effect　　The material undergoing phase transformation will exhibit a phenomenon where the resistance rapidly increases by several to more than ten orders of magnitude along a narrow temperature range, known as the

August 04,2023

What are the functions and types of fuse holders.power probe fuse voltage drop chart

　　　　1、 What is the function of a fuse?　　If a common fault occurs in the circuit, such as an open circuit problem, the current will continue to rise, which may cause circuit damage and endanger household appliances, and in severe cases, can lead to a fire accident. However, fuses were installed and used. When abnormal current is found, if it reaches a certain Elevation, the fuse will blow, and then all circuits will be disconnected for maintenance.　　2、 What type of fuse.　　There is one type of fuse called a disposable fuse, and the other is a self repairing fuse. Some fuses are composed of patches or plugs. Different fuses are applied in different office environments, some in high-voltage natural environments and some in low-voltage natural environments, fully playing an increasingly crucial role.　　2. A fuse consists of three parts, one of which is the melt, which is the main location for all fuses. If there is a circuit problem, it can be independently fused and then the circuit can be

July 20,2023

Characteristics of fuses and fuses.resettable pptc fuse

　　　　For the melt, its operating current and operating time characteristics are the ampere second characteristics of the fuse, also known as the inverse time delay characteristics, that is, when the overload current is small, the fusing time is long; When the overload current is high, the fuse time is short.　　Our understanding of the ampere second characteristic can be seen from Joule's law that Q=I2 * R * T. In a series circuit, the R value of the fuse remains basically unchanged, and the heat generated is proportional to the square of the current I and the heating time T. This means that when the current is high, the time required for the melt to fuse is shorter. When the current is low, the melting time required for the melt to melt is longer, and even if the rate of heat accumulation is less than the rate of heat diffusion, the temperature of the fuse will not rise to the melting point, and the fuse will not even blow. So, within a certain overload current range, when the current re

August 18,2023

Will plug-in fuses be phased out?resettable ptc fuse

　　　　In fact, this is not the case. Although patch fuses have a wider range of applications than plug-in fuses, there is also a high demand for plug-in fuses in the market. Both types of fuses, patch and plug-in, have their own advantages. For different products, selecting the right one can maximize the effectiveness of the fuse. Currently, plug-in fuses will not be eliminated.　　Taking self recovery fuses as an example, the volume of patch based self recovery fuses is different from that of plug-in based self recovery fuses. Plug-in type fuses have a relatively larger volume and are generally used in circuits with low working voltage and high working current, such as power converters, motorcycles, automobiles, computer power supplies, micro motors, computer interfaces, CPUs, and other fields. And patch type fuses are mostly used in many electronic products and in many circuit boards such as mechanical equipment.　　With the development and progress of technology, fuses are not only limite

November 06,2023

temperature regulating waterproof mattress protector.

　　　　1： The testing process is as follows:　　1. Initial internal resistance Rimin measurement: Unpack, take out the fuse, and measure the internal resistance of the fuse;　　2. Welding: Solder the fuse onto the PCB through reflow soldering, with leads connected to the PCB for easy electrical performance testing;　　3. Hold current IHold test: Select a DC constant voltage and current source for testing. Adjust the voltage to the voltage Vmax specified in the specification,　　Adjust the current to the holding current Ihold specified in the specification and power on for 15 minutes;　　4. Action current Itrip test: Select a DC constant voltage and current source for testing. Adjust the voltage to the voltage Vmax specified in the specification,　　Adjust the current to the holding current Itrip specified in the specification and power on for 5 minutes;　　5. R1max test: Cool the activated fuse for 1 hour and measure the internal resistance of the fuse.　　2： Test standards:　　1. The testing environment i

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Fuseless car charger, carefully burn your phone

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2023-04