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August 26,2023

Introduction to ceramic gas discharge tubes

　　　　Ceramic gas discharge tubes are the most widely used switching devices in lightning protection equipment. Whether it is for lightning protection of AC and DC power supplies or various signal circuits, they can be used to discharge lightning currents into the ground. Its main characteristics are: high discharge current, small interpole capacitance (≤ 3pF), high insulation resistance (≥ 109 Ω), high dispersion of breakdown voltage (± 20%), and slow reaction speed (the fastest is 0.1-0.2 μ s) . According to the number of electrodes, there are two types of discharge tubes: bipolar discharge tubes and bipolar discharge tubes (equivalent to two bipolar discharge tubes connected in series). Its shape is cylindrical, with two structural forms: with and without leads (some also have protective cards for short circuits in case of overheating).　　A gas discharge tube consists of two electrodes enclosed at a certain distance in a ceramic tube filled with inert gas. Its electrical performance ba

August 29,2024

What is the difference between resettable fuses and traditional fuses?

　　　　PPTC and fuses both do the same job: protecting electronic circuits from overcurrent related issues. The difference is that the fuse must be replaced after tripping, while PPTC can reset itself. PPTC can handle sudden overcurrent events without the need for replacement.　　PPTC and fuses both react to excessive current by generating heat, but they react in different ways. The fuse melts and breaks, completely interrupting the current, while PPTC limits the current by changing from a low resistance state to a high resistance state as the temperature increases. In short, if it is necessary to stop the current to fully protect the equipment, fuses are preferred. On the other hand, PPTC is typically used to anticipate situations where overcurrent events frequently occur, and it is crucial to maintain a constant system uptime at a lower service cost. They are also useful in remote or hard to reach places where replacing fuses is challenging.　　Both circuit breakers and resettable fuses can

August 19,2023

The Function of Fuses in Home Circuit Leakage Protectors.battery fuse block

　　　　The voltage of a household circuit is usually 220V, and the current flowing through it is also very large. If a household circuit malfunctions or leaks, it will threaten human life safety. Therefore, in order to prevent this harm, we usually install an overload protection device in the main circuit of the household or install a fuse in the circuit. Some people want to know which one of these two has the greater effect? Next, the editor will answer for everyone.　　1、 The function of leakage protector:　　Leakage protector, also known as leakage switch or leakage protector, is mainly used to protect equipment from leakage faults and potentially fatal personal electric shock. It has overload and short circuit protection functions and can be used to protect circuits or motors from overload and short circuits. It can also be used for infrequent switching and starting of circuits under normal circumstances.　　Leakage protectors can be classified according to their protection function, struct

July 04,2023

Working principle of fuses

　　　　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, the fuse will not

July 12,2023

Precautions for using fuses.fast blow vs slow blow fuse

　　　　(1) Precautions for using fuses: ① The protective characteristics of the fuse should be compatible with the overload characteristics of the protected object. Considering the possible short-circuit current, a fuse with corresponding breaking capacity should be selected.　　② The rated voltage of the fuse should adapt to the line voltage level, and the rated current of the fuse should be greater than or equal to the rated current of the melt.　　③ The rated current of each level of fuse melt in the circuit should be matched accordingly, and the rated current of the previous level of melt must be greater than the rated current of the next level of melt.　　④ The melt of the fuse should be matched according to the requirements, and it is not allowed to arbitrarily increase the melt or use other conductors to replace the melt.　　⑵ Fuse inspection:　　① Check whether the rated values of the fuse and melt match the protected equipment.　　② Check the appearance of the fuse for damage or deformation,

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Fuseless car charger, carefully burn your phone

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