A fuse resistor has a similar function to a fuse, that is, it can cut off the current when the circuit is overcurrent and also act as a fuse. Therefore, many people are prone to confusion. However, the load of a resistor has a certain limit, and if the current flowing through the resistor exceeds the limit, it will burn out the resistor, causing it to appear in an open circuit state. This is different from the fuse's blow protection. The protection function includes overload protection and short circuit protection, that is, when the circuit experiences unacceptable overcurrent up to the limit of short circuit overcurrent, the fuse must act within the specified time range to protect the circuit or components. However, the technical parameters such as the starting time and duration of the fuse resistor cannot be as accurate as the fuse, and overload current protection cannot be guaranteed, It can only have a slight effect on short-circuit current. The carrying function of a fuse is
Traditional fuses are installed in circuits. When an overcurrent occurs due to a fault or abnormality in the circuit, the fuse itself melts to cut off the current and protect the circuit. However, due to the fact that traditional fuses can only protect once and need to be replaced if burned out, some products still cannot resume operation after troubleshooting or abnormal overcurrent disappears. As a new type of overcurrent protection device, the self recovery fuse has the function of automatic recovery, which can meet the performance requirements of similar applications. The self recovery fuse is connected in series in the circuit, and under normal circumstances, it is in a low resistance state to ensure the normal operation of the circuit; When a circuit experiences a short circuit or abnormally high current flows in, the self-heating of the self-healing fuse increases its impedance and limits the current to a sufficiently small amount, providing overcurrent protection. Self re
Fuses are commonly known as fuses or fuse tubes. The earliest fuse was invented by Edison over a hundred years ago. Due to the underdeveloped industrial technology at that time, incandescent lamps were very expensive, so they were initially used as fuses to protect expensive incandescent lamps. Fuses protect electronic devices from current damage and can also prevent serious injuries caused by internal faults in electronic devices. Therefore, each fuse has a rated specification, and when the current exceeds the rated specification, the fuse will melt. When a current between the conventional non fusing current and the rated breaking capacity specified in relevant standards is applied to a fuse, the fuse should be able to operate satisfactorily without endangering the surrounding environment. The expected fault current of the circuit in which the fuse is installed must be less than the rated breaking capacity current specified in the standard. Otherwise, when a fault occurs, the fus
A thermistor is a type of thermoelectric resistor, and the principle of thermistors is that temperature causes a change in resistance. However, nowadays thermoelectric resistors are generally industrialized, mainly referring to commonly used thermistors such as PT100 and CU50. The difference between thermistors and thermistors is that generally, thermistors refer to metal thermistors (PT100), while thermistors refer to semiconductor thermistors. Due to the temperature coefficient of semiconductor thermistors being more than 10-100 times larger than that of metals, they can detect temperature changes of 10-6 ℃, and the resistance value can be arbitrarily selected between 0.1 and 100k Ω. So it is called a thermistor. The curve of the resistance value of a thermistor with temperature changes is non-linear, and the linearity of each same model is also different, and the temperature measurement range is relatively small. So in industry, metal thermistors are generally used, which is wha
The polymer overcurrent protection element is made of polymer materials with conductive particles added. The basic principle is an energy balance: when the current flows through the component, heat is generated due to the power consumption of the current, and some of the generated heat is dispersed and sent to the environment, while others increase the temperature of the polymer material. At the corresponding working current, the heat generated by the component and the heat dissipated reach a balance, and the current can pass through normally. When excessive current is generated, the component rapidly generates heat that cannot be dissipated in a timely manner, resulting in an increase in the temperature of the polymer material inside the component. When the temperature reaches the crystallization and melting temperature of the material, the polymer material rapidly expands, blocking the conductive path composed of conductive particles, resulting in a rapid increase in electrical r
We know that fuses often generate heat during continuous operation, leading to an increase in surrounding temperature and thus affecting the performance of the fuse. Therefore, when selecting fuse models, we should pay attention to the influence of temperature. The action of a fuse is directly caused by heat, so the ambient temperature must have an impact on the performance of the fuse. The ambient temperature here not only refers to the indoor or outdoor temperature around the electronic and electrical equipment, but more importantly, it refers to the temperature around the small environment where the fuse is located inside the machine during equipment operation. This will directly affect the performance of the fuse. Generally, the maximum atmospheric temperature will not exceed 500 ℃, but the small environment temperature inside the machine may even exceed 1000 ℃, which will have a significant impact on the performance of the fuse. From this, it can be seen that the higher the
In electronic products, chip fuses have two functions: to protect end-users from harm and to protect circuits from damage. These features benefit both device users and manufacturers. In the past decade, the demand for electronic devices serving information technology, mobile, and consumer applications has sharply increased in the market. Along with this rapidly growing demand, the risk of unexpected situations in electronic devices has also increased, requiring the use of overcurrent protection devices such as chip fuses to avoid risks such as electrical overload. Before analyzing the electrical characteristics of various chip fuses in the market, it is first necessary to understand the basic design principles behind each technology. Standard fuses may be based on metal wires placed inside sealed ceramic or glass tubes filled with air or sand, but chip fuses are based on completely different principles. Most chip fuses appear to be standard chip devices and are made from single o
Many people often encounter confusion when reading the parameter information of self recovery fuses, as they do not understand the meaning of the symbols used, which causes reading difficulties. Here is an explanation from the symbol of self recovery fuse parameters, hoping to help everyone: The maximum operating current of the IH self-healing fuse element at an ambient temperature of 25 ℃ The minimum current for it self recovery fuse element to activate protection at an ambient temperature of 25 ℃ Imax self-healing fuse element can withstand maximum current The maximum operating voltage of the Vmax self recovery fuse element The maximum voltage that the Vmaxi self-healing fuse element can withstand in a blocked state The initial minimum resistance value of the Rmin self recovery fuse element before operation The initial maximum resistance value of the Rmaxi self recovery fuse element before its final operation The holding current Ih is the maximum current that can be passe
1. Filamentous. Early primitive fuses were directly locked with screws and used for various sizes of old-fashioned switches and sockets. 2. Flaky (bare flake). More convenient to use than traditional filiform. 3. Glass tube shaped. There are several different sizes, commonly found in electronic products. 6.3x32mm (diameter x length) 5x20mm 4. Ceramic tubular. There are several different shapes and sizes to avoid glass bursting. 5. Plastic sheet with metal sheet connector: automotive fuse. 6. Surface mounted component (SMD) type. 7. Cylindrical, plug-in type: directly soldered onto the circuit board, used internally in the product.
A general fuse consists of three parts: one is the melt part, which is the core of the fuse and plays a role in cutting off the current when blown. Fuses of the same type and specification should have the same material, geometric size, and resistance value as small and consistent as possible. It is important to have consistent fusing characteristics, and household fuses are commonly made of lead antimony alloy; The second is the electrode part, which usually has two important components that connect the melt to the circuit. It must have good conductivity and should not generate obvious installation contact resistance; The third part is the support part. The melt of the fuse is generally thin and soft. The function of the support is to fix the melt and make the three parts a rigid whole for easy installation and use. It must have good mechanical strength, insulation, heat resistance, and flame retardancy, and should not produce phenomena such as breakage, deformation, combustion, an
Fuses are mainly used as basic protective devices for preventing short circuit faults in household appliances. They are generally equipped and selected based on the current of the household appliance. This can be simply calculated by considering current=(power ÷ voltage)&TIMes; 1.5, for example, electrical equipment current=1 kW ÷ 220 V&TImes; 1.5=6.8A, you can choose fuses 6-8A. The fusing current of a fuse is usually 1.5-2.0 times the rated current. If the total power of each household appliance exceeds 1100 watts during normal electricity use in a household, choose a 5-ampere fuse and use a No. 20 fuse with a diameter of 0.98 millimeters. When the current exceeds 7.5 amperes to 10 amperes, the fuse will automatically blow to achieve protection. SMD fuses are made of lead antimony alloy with high resistivity and low melting point. Its function is to generate more heat when there is too much current in the circuit, causing its temperature to reach the melting point, thereby fusi
Type scale¤t standard high current patch fuse (HA/HB) 1206: relatively large to 30A slow break patch fuse (SB) 1206: relatively large to 8A slow break patch fuse (SB) 0603: relatively large to 8A high pulse patch fuse (HI) 1206: relatively large to 8A high pulse patch fuse (HI) 0603: relatively large to 5A fast break patch fuse (FA) 1206: relatively large to 8A fast break patch fuse (FA) 0603: Relatively large to 6A fast break patch fuse (FA) 0402: Relatively large to 4A ultra fast break patch fuse (FF) 0603: Relatively large to 5A HA/HB: High current standard. Very suitable for various high current products, such as servers and storage systems, DC/DC converters, power tools, etc There are many series of fuses in the electronic component market, among which are patch fuses. This series of fuses is widely used in factories, with few being used by individual users. According to industry experts, SMD fuses are a relatively high skill level new variety in the small fuse profession. C
SMD chip fuses have been very popular in the domestic market in recent years, and they are on par with plug-in fuses. However, due to their small size and other advantages, SMD chip fuses have gradually occupied a place in daily life. Now, I will briefly explain the market prospects of SMD chip fuses. In its over 100 year history, small fuses have gone through multiple stages of development, including cylindrical, plug-in, axial or radial pin types. The surface mount fuse, which emerged in the 1990s, has developed to account for nearly 30% of the overall small fuse application market in less than 20 years, and is continuously expanding, replacing other traditional forms of fuses, indicating its strong vitality. With the vigorous development of the electronic industry, the small fuse market is showing a continuous growth trend, especially in 2015, where the development momentum is encouraging. The development of surface mount fuses is increasing day by day, accounting for one-thir
1. Filamentous. Early primitive fuses were directly locked with screws and used for various sizes of old-fashioned switches and sockets. 2. Flaky (bare flake). More convenient to use than traditional filiform. 3. Glass tube shaped. There are several different sizes, commonly found in electronic products. 6.3x32mm (diameter x length) 5x20mm 4. Ceramic tubular. There are several different shapes and sizes to avoid glass bursting. 5. Plastic sheet with metal sheet connector: automotive fuse. 6. Surface mounted component (SMD) type. 7. Cylindrical, plug-in type: directly soldered onto the circuit board, used internally in the product.
A general fuse consists of three parts: one is the melt part, which is the core of the fuse and plays a role in cutting off the current when blown. Fuses of the same type and specification should have the same material, geometric size, and resistance value as small and consistent as possible. It is important to have consistent fusing characteristics, and household fuses are commonly made of lead antimony alloy; The second is the electrode part, which usually has two important components that connect the melt to the circuit. It must have good conductivity and should not generate obvious installation contact resistance; The third part is the support part. The melt of the fuse is generally thin and soft. The function of the support is to fix the melt and make the three parts a rigid whole for easy installation and use. It must have good mechanical strength, insulation, heat resistance, and flame retardancy, and should not produce phenomena such as breakage, deformation, combustion, an
Fuses are mainly used as basic protective devices for preventing short circuit faults in household appliances. They are generally equipped and selected based on the current of the household appliance. This can be simply calculated by considering current=(power ÷ voltage)&TIMes; 1.5, for example, electrical equipment current=1 kW ÷ 220 V&TImes; 1.5=6.8A, you can choose fuses 6-8A. The fusing current of a fuse is usually 1.5-2.0 times the rated current. If the total power of each household appliance exceeds 1100 watts during normal electricity use in a household, choose a 5-ampere fuse and use a No. 20 fuse with a diameter of 0.98 millimeters. When the current exceeds 7.5 amperes to 10 amperes, the fuse will automatically blow to achieve protection. SMD fuses are made of lead antimony alloy with high resistivity and low melting point. Its function is to generate more heat when there is too much current in the circuit, causing its temperature to reach the melting point, thereby fusi
Due to the characteristic of instantaneous resistance jump, this type of PTC is often used for overcurrent protection in electrical products. We know that for a conductor, its resistance value is R. When the current flowing through the conductor is I and the duration is t, the heat generated by the conductor Q can be calculated using Joule's law: Q=I ^ 2 * R * t. It can be seen that the heat generated by the conductor is proportional to the square of the current flowing through the conductor I, that is, as long as the current increases a little, the heat generated Q will sharply increase. During normal operation, due to the small working current IH, the heat generated by the current flowing through PTC is not sufficient to reach the Curie point. PTC has always shown a zero power resistance Rmin at the factory, usually at the milliohm level (specific data varies depending on the PTC series), which is equivalent to the closed state of a switch. Once the current flowing through PTC It
1. Product certification. For example, exporting to North America requires UL or CSA certification. At present, products exported to Europe still need to comply with the RoHs directive of the European Union, which is commonly referred to as environmental certification such as SGS. 2. The normal working current of the circuit. The working current through the fuse should not exceed 75% of the rated current of the fuse. 3. The applied voltage applied to the fuse. Usually, patch fuses are used in portable devices, and the working voltage of the circuit is generally not high. As long as the rated voltage of the patch fuse is higher than the working voltage of the circuit, it can be used with confidence. 4. The ambient temperature of the fuse. When applying patch fuses to portable devices, appropriate consideration should be given to the temperature rise of the fuse, that is, the reduction of the rated current of the fuse. The ambient temperature during fuse operation should be within
Chip fuses can be divided into 9 categories based on their volume size: 0402 volume, 0603 volume, 0805 volume, 1206 volume, 1210 volume, 1812 volume, 2410 volume, 2920 volume, and 4012 volume. The most commonly used volumes for SMD fuses are 1206, 18122410, and 0603, followed only by a small amount of remaining volume. The commonly used models for SMD self recovery fuse 1206 include ASMD1206-020 (0.2A/24V), ASMD1206-025 (0.25A/16V), ASMD1206-050 (0.5A/6V), ASMD1206-050-16V (0.5A/16V), ASMD1206-050-24V (0.5A/24V), ASMD1206-075 (0.75A/6V), ASMD1206-100 (1A/6V), ASMD1206-150 (1.5A/6V), ASMD1206-200 (2A/6V), and ASMD1206-300 (3A/6V). The commonly used models for SMD self recovery fuse 1812 include ASMD1812-010, ASMD1812-020, ASMD1812-050, ASMD1812-050-30, ASMD1812-075, ASMD1812-110, ASMD1812-110-16, ASMD1812-150, ASMD1812-200, ASMD1812-300, and ASMD1812-350. The commonly used models for SMD self recovery fuse 0603 are ASMD0603-010, ASMD0603-020, ASMD0603-050, and ASMD0603-075. The
In application, step-up transformers are mainly used in instruments and meters; For the power supply of electronic products, the majority of self recovery fuses are actually step-down transformers. Structurally, the transformer is composed of stacked silicon steel sheets and primary coils. The coil is mostly wound with enameled copper wire, and now it is also used with enameled aluminum wire. Power transformers are commonly used components in electronic products and are widely used due to their simplicity and ease of manufacture. There are two types of transformers: step-up transformers and step-down transformers (excluding impedance transformers and line matching transformers). They are also called linear transformers because they increase or decrease the original AC voltage proportionally and output it to the load for power supply. For step-down transformers, their characteristics are: the primary input is 220V, the secondary output is low-voltage, the secondary current is small,
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
