1. How to choose a patch fuse (using well-known brands such as litelfuse bussmann to illustrate the commonly used size of patch fuses 1206 2410 0603) Chip fuses are mainly used in electronic products such as digital cameras, laptops, and mobile phones.. From traditional glass tube fuses to micro fuses and chip fuses, the focus of their selection is slightly different due to differences in product technology. The selection of patch fuses involves the following factors: (1) The normal working current of the circuit. The working current through the fuse should not exceed 75% of the rated current of the fuse. (2) Pulse, impulse current, surge current, starting current, and circuit transient values. SMD fuses are particularly concerned about this point. Due to the small size of the fuse, the impact resistance of SMD fuses is much lower than that of glass tube fuses or other larger fuses with the same rated current. (3) The magnitude of the overload current in the circuit and the sh
The main difference between slow fuse and fast fuse is its ability to withstand instantaneous pulse current, which means that it can resist the impact of surge current when switching on and off, thereby ensuring the normal operation of the equipment. Therefore, slow fuse is often referred to as surge resistant fuse. From a technical perspective, slow melting fuses have a large melting heat value of I2t, and the energy required for fuse melting is relatively high. Therefore, for fuses with the same rated current, slow melting has a much stronger ability to withstand pulses than fast melting. Due to the fact that the I2t of a slow fuse is larger than that of a fast fuse of the same specification, the fusing time in the event of overcurrent in the circuit will also be slower than that of a fast fuse. Is it possible that the protection performance may be worse than some people are concerned about? We said no! Because once a circuit malfunctions, the overcurrent will not disappear on i
With the development of highly integrated electronic products such as digital cameras, laptops, and smartphones, and the urgent need for factories to adopt full automation to reduce high labor costs in the market environment. Chip fuses are widely used in overcurrent protection applications, but due to differences in technology, they have different advantages compared to plug-in self recovery fuses. At the same time, chip fuses also have some of their own weaknesses. So there are some things to pay attention to when selecting SMD fuses: 1 Maintain current. When selecting a type, it is necessary to determine the normal current of the circuit to select the corresponding model of SMD fuse. Maintaining current needs to be equal to or similar to the normal working current of the circuit Action current. When selecting the protected current, the operating current of the patch fuse should be less than or equal to the current that needs to be protected in the protected circuit. 3. Withstand
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
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
1. Determine the following parameters of the circuit: A Maximum working environment temperature b Standard working current c Maximum working voltage (Umax) d Maximum fault current (Imax) 2. Select a self restoring fuse element that can adapt to the maximum ambient temperature and standard operating current of the circuit Use a temperature reduction {ambient temperature (℃) working current (A)} table and select the temperature that best matches the maximum ambient temperature of the circuit. Browse this column to view values that are equal to or greater than the standard operating current of the circuit. 3. Compare the maximum electrical rating of the selected component with the maximum operating voltage and fault current of the circuit Use the electrical characteristic table to verify whether the components you selected in step 2 will use the maximum operating voltage and fault current of the circuit. Check the maximum operating voltage and maximum fault current of the device.
MB:+86 13924633629 Ms.vicky
E-mail: waimao@xcfuse.com
Factory :
XC Electronics(Shenzhen)Corp.,LTD
Add: Jinyuan Industrial zone,Heao, Henggang, Shenzhen 518115,China
Shenzhen branch: Shenzhen Xucheng Electronic Commerce co.Ltd
Add: 8-15 Jinyuan Industrial zone,Heao, Henggang, Shenzhen 518115,China
