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　　　　Fuse, alias current fuse, is defined as "fuse link" in IEC127 standard and is a thermal Response element. The fuse is installed in a fuse box (fuse) or knife switch and connected in series in the circuit. The fuse invented by Edison over a hundred years ago was used to protect expensive incandescent lamps at that time.　　The fuse is mainly composed of three parts: the melt part, the electrode part, and the bracket part. Fuses are generally made of fusible metals such as lead, tin, lead-tin alloy, or zinc, with a very low melting point (approximately 200-300 ℃). Under normal circumstances, fuses can maintain reliable operation of the power grid, but in the event of overload or short circuit conditions, fuses with lower melting points are heated to the melting temperature by current and continue to be heated, causing some fuses to melt and vaporize, thereby cutting off the protected circuit and ensuring the safety of electrical appliances and connecting wires. Fuses are composed of po

September 21,2023

The principle of fuses.air conditioner fuse box replacement

　　　　When a fuse is energized, its own resistance converts electrical energy into heat, causing the melt to heat up. At the same time, the heat generated by the current also radiates to the surrounding environment through the melt and shell, and dissipates heat through convection and conduction. When a fuse passes through the allowable working current, the heat emitted and generated reaches a balance, and the heat does not accumulate in the melt, causing the temperature of the melt to rise. Therefore, the fuse will not reach its melting point and blow. When the current passing through the fuse reaches a certain value, the heat converted from electrical energy increases, and the heat dissipation rate cannot keep up with the heating rate. This heat gradually accumulates on the melt, causing the temperature of the melt to rise. When the temperature reaches the melting point of the fuse, the fuse begins to melt and continues to absorb heat, further melting into a liquid state. Subsequently,

July 20,2023

Structure of fuse and fuse.tv blown fuse symptoms

　　　　The rated current of the melt is not equal to the rated current of the fuse. The rated current of the melt is selected based on the load current of the protected equipment. The rated current of the fuse should be greater than the rated current of the melt and determined in conjunction with the main electrical appliance.　　The fuse is mainly composed of three parts: the melt, the shell, and the support, among which the melt is a key component that controls the fusing characteristics. The material, size, and shape of the melt determine the fusing characteristics. Melt materials are divided into two categories: low melting point and high melting point. Low melting point materials such as lead and lead alloys have a low melting point and are prone to melting. Due to their high electrical resistivity, the cross-sectional size of the melt produced is larger, and the metal vapor generated during melting is more. They are only suitable for fuses with low breaking capacity. High melting poin

November 08,2023

fast blow or slow blow fuse for multimeter.What are the standard requirements for self restoring fuse technology?

　　　　Self recovery fuse is a type of overcurrent electronic protection component, which is made by mixing conductive particle materials with polymer organic polymers under high pressure, high temperature, and vulcanization reaction conditions, and processed through special processes. What are the standard requirements for self restoring fuse technology? 1. The rated zero power resistance PPTC thermistor should be packaged in different levels according to the zero power resistance, 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|　　2. The PTC effect refers to a material with a Positive Temperature Coefficient (PTC) effect, which means that the resistance of the material increases with increasing temperature. Most metal materials have the PTC effect. In these materials, the

October 10,2023

Setting of fuse position.motorcycle blown fuse symptoms

　　　　To fully utilize the protective effect of a fuse in a circuit, the position of the fuse in the circuit should be considered when designing the circuit.　　The fuse can be blown in a timely manner to protect the circuit and switch;　　And the fuse cannot be blown in a timely manner, unable to protect the front-end circuit and switch. If a short circuit occurs at B, the fuse can only be blown in a timely manner, which can protect the circuit;　　As shown in the circuit diagram, when a short circuit occurs at point A, the switch will still burn out, while the fuse will not blow, meaning that the fuse in this circuit cannot protect the circuit and electrical components. So the circuit diagram is the most reasonable one for designing the position of the fuse in the circuit.　　Note: For the case where relays and fuses are integrated in the same electrical box, the fuse connection is not closely related (as the possibility of a short circuit occurring within the same electrical box is not high),

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Fuseless car charger, carefully burn your phone

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2023-04