1. Working environment temperature: Excessive ambient temperature can damage the lifespan of fuses. Slow melting fuses, such as tin ball type, begin to diffuse towards the metal wire when the temperature is about 160 ℃ (150-170 ℃); The temperature at which the melt of a fast melting fuse begins to undergo severe oxidation is approximately 200 ℃ (175-225 ℃). With the oxidation of the fuse from the outside to the inside, multiple diffusion, thermal stress fatigue, etc., the lifespan of the fuse will gradually shorten. Therefore, it is recommended that the delay type fuse fuse should not work above 150 ℃ for a long time, and the fast melting type fuse should not work above 175~225 ℃ for a long time. 2. Pulse current: Pulse impact can generate thermal cycling, leading to diffusion, oxidation, thermal stress, and even acceleration of the fuse. The fuse will gradually age with increasing pulse energy and frequency. The impact resistance life of a fuse depends on the percentage of I2t of
The safety tube is divided into glass safety tube and ceramic safety tube. The glass safety tube body is made of glass material, and the ceramic fuse tube body is made of ceramic material. Whether it is a glass safety tube or a ceramic safety tube, both ends of the material are made of nickel plated brass, and the pins of both types of safety tubes are also made of nickel plated brass material. The fuses inside the fuse are mainly made of alloy. Glass safety tubes are also divided into glass safety tubes with pins and glass safety tubes without pins. According to the speed of melting, there are three specifications: fast break glass safety tubes and slow break glass safety tubes: 3.6 * 10mm, 5 * 20mm, and 6 * 30mm. Next, let's learn about the detailed specifications and models of 30A 250V glass safety tube with pins. There are 5 * 20mm specification JFG5F2300 glass fuse models that can achieve 30A and 250V. This part number can be divided into two types: with pins and without pins
Insert type fuses can be divided into A6, A16, A30, A60, A72, A240, A250, and A600 according to voltage. Their maximum voltages are 6V, 16V, 30V, 60V, 72V, 240V, 250V, and 600V, respectively. The corresponding model of the 2.5A 6V plug-in fuse is A6-250. This model is a fast fusing recoverable fuse. The maximum current of this part number is 40A, the maintenance current is 2.5A, the operating current is 5.0A, and the power generated during operation is 1.2W. The minimum internal resistance is 0.022 Ω, and the maximum internal resistance is 0.08 Ω. The operating range of plug-in fuses in this series is -40 ℃~+85 ℃. The A6-250 plug-in fuse has a square curved foot shape, with a maximum width of 11.4mm, a maximum height of 18.3mm, a foot pitch of 5.1 ± 0.5mm, a minimum foot length of 7.6mm, and a maximum thickness of 3.0mm. There are two packaging methods for A6-250 plug-in fuses: one is ribbon packaging, with a quantity of 3000 pieces per ribbon, and the other is bag packaging, with
When it comes to identifying fuses, the most direct method is to check the silk screen of the fuse. The Shenzhen brand 1812 encapsulates a 1.1A 16V fuse with a corresponding model of ASMD1812-110-16V. The fuse corresponding to this encapsulation current value has a conventional voltage value of 8V ASMD1812-110, a voltage value of 24V ASMD1812-110-24V, and a special voltage value of 33V ASMD1812-110-33V. The silk screen of these models above is all 110, so some people may ask, how do I distinguish fuses with the same current value but no voltage value in the same package? The voltage value we mentioned above is actually the maximum voltage that the fuse can withstand, and we need to remove the detection tool to detect the maximum voltage of the fuse. Let's learn about some other important parameters of the 1812 encapsulated 1.1A 16V patch recoverable fuse. The ASMD1812-110-16 fuse is a patch type recoverable fuse with a rated current of 1.1A, capable of withstanding a maximum volta
The commonly used series of plug-in fuses include A16, A30, A60, A72, A240, A250, A600, which belong to plug-in recoverable fuses. The maximum voltage of the A250 series plug-in fuse is 250V, and the commonly used current range of this series is 0.03A-1A. Today we will learn about the 1.2A fuse part number of the 250V series plug-in fuse type. 250V 1.2A plug-in fuse, the corresponding model of the brand is A250-1200. The holding current of this material number is 1.2A, the triggering current is 2.4A, the maximum voltage range is 220V~250V, and the maximum current is 5A. When the current passing through the fuse reaches the classic current value of 6A, the fuse will operate within 15 seconds. The power Pdtyp generated during the action of this material number is 5W, with a minimum resistance Rmin of 0.17 Ω, a maximum resistance Rmax of 0.28 Ω, and a maximum resistance R1max of 0.5 Ω after the first action. The dimensions of the A250-120 plug-in fuse are: width A: 16.7mm, height B:
The corresponding model of the brand 600V 0.5A plug-in fuse is A600-500, which is a recoverable fuse that plays an overcurrent protection role in the circuit. This model of fuse is a fast melting fuse that maintains a current of 0.5A, operates with a current of 1A, a maximum voltage of 600V, and a maximum voltage of 3A. The power generated by the fuse during operation is 5W. When the current passing through the fuse is 2.5A, the fuse will operate within 15S, At this moment, the minimum internal resistance of the fuse of the material number is 2.5 Ω, and the internal resistance after one hour of welding on the machine is 7 Ω. The above data are all for at room temperature of 25 ℃. We all know that the parameters of fuses can be affected in different working environments. If the rated current at 25 ℃ is 0.5A at room temperature, then at 40 ℃, the maintenance current of the fuse is only 88% of that at room temperature, which is 0.44A; At a temperature of 50 ℃, the fuse of this materia
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