When the applied voltage disappears, the resettable fuse can automatically recover. Fuse 1. Rated zero power resistor PPTC thermistors should be packaged as zero power resistors, and the resistance range should be indicated on the outer packaging. After withstand voltage and withstand current tests, the range of resistance change rate of each group of samples before themselves is δ | Ri before Ri/Ri before - (Rj before Rj)/Rj before | ≤ 100% 2. PTC effect Saying that a material has a PTC (positive temperature coefficient) effect means that the material's resistance increases with increasing temperature. For example, most metal materials have 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 Materials undergoing phase transition will exhibit a phenomenon of rapid increase in resistance within a narrow temperature range of seve
Functional parameters of plastic encapsulated patch varistors 1. Rated voltage (Ur): refers to the highest voltage that PPTC can withstand, usually expressed in volts (V), such as Ur=24V. 2. Power outage current (IH): refers to the current that cuts off the circuit when the temperature of the PPTC rises at rated voltage, usually expressed in amperes (A), such as IH=1A. 3. Trigger current (IT): Refers to the current at which PPTC begins to respond, that is, when the current gradually increases to a certain value, PPTC will begin to reduce resistance, usually expressed in milliampere (mA), such as IT=100mA. 4. Zero current resistance (Ro): refers to the resistance value of a circuit passing through PPTC when it is in a normal state, usually expressed in ohms (Ω), such as Ro=40 Ω. 5. Maximum current (Imax): refers to the maximum current that PPTC can pass through, usually expressed in amperes (A), such as Imax=3A. 6. Working temperature (Tw): refers to the normal operating tempera
The correct steps for selecting a self recovering fuse model 1. Determine the following parameters of the circuit: ● Maximum working environment temperature ● Standard operating current Maximum operating voltage (maximum) Maximum fault current (Imax) 2. Choose a resettable fuse that can adapt to the highest ambient temperature and standard operating current of the circuit. Use the table below and select the temperature that best matches the highest ambient temperature of the circuit. Browse this column to find values 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 electrical characteristics to verify whether the components 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 equipment. Ensure that Umax an
Difference between disposable fuses and self-healing fuses 1、 Structure There are two types of self-healing fuses: polymer PPTC and ceramic CPTC. We usually use polymer self-healing fuses, which are composed of polymer resin and conductive particles distributed in it. Under normal operation, the polymer resin tightly binds with the conductive particles outside the crystal structure, forming a chain like conductive path. Under normal operation, the resistance of self-healing fuses is very low, ranging from tens of milliohms to several ohms. A blown fuse is composed of three parts: the main body, electrode terminals, and bracket. The main body is its core, which is a melt made of low melting point metal wire or metal sheet. The electrode terminals are used to connect the circuit and the melt, with good conductivity, and the support is used to fix the melt. 2、 Principle For PPTC self-healing fuses, during normal operation, the heat generated by the current flowing through it is ver
How does a resettable fuse work? The resettable fuse is composed of specially treated polymer and carbon black distributed inside. Under normal operation, polymers tightly bind conductive particles outside the crystal structure, forming a chain like conductive pathway. At this point, the resettable fuse is in a low resistance state, and the heat generated by the current flowing through the resettable fuse is minimal and will not change the crystal structure. When the circuit is short circuited or overloaded, the large current flowing through the resettable fuse will cause the polymer to melt, and the volume will rapidly increase, forming a high resistance state. The working current will rapidly decrease, thereby limiting and protecting the circuit. After the fault is eliminated, the reset fuse can cool down and crystallize again. The volume is reduced, and the conductive particles form a conductive path again. The reset fuse can be restored to a low resistance state, thus complet
The working principle of self recovering fuse PPTC The main advantages of polymer PPTC are: At room temperature, zero power resistors can be very small High current products only have a few milliohms Low power consumption in the circuit can be ignored The volume is relatively small. PPTC can be connected in series in precision circuits as a resettable thermal fuse for overcurrent protection. The resistance changes quickly, about a few milliseconds, the heat capacity is small, and the recovery time is short. In addition, it also has impact resistance and can achieve up to 8000 cycles of cycle protection. PTC can be used as a reheating fuse, which to some extent reflects the performance and function of self reheating fuses in circuits. In this way, overcurrent protection and over temperature protection can be implemented in the circuit. The main advantages of ceramic CPTC are its low price and ease of manufacturing. But it has high resistance, large volume, and large online los
How to design chip fuses 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 market demand for electronic devices serving information technology, mobile, and consumer applications has been rapidly increasing. 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 electrical overload and other risks. Before analyzing the electrical characteristics of various chip fuses in the market, the most important thing is to first 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, while chip fuses are based on completely different principles. Most chip fuses appear to be standard
Precautions for using plastic encapsulated patch varistor fuses 1. Proper selection and installation are necessary to ensure its proper functioning. During use, do not arbitrarily change the parameters of PPTC to avoid damage to components and equipment. 2. Long term work in environments such as high temperature, humidity, corrosion, and electromagnetic interference should be avoided to avoid affecting the mechanical and electrical characteristics of PPTC. 3. After the temperature rises and triggers, it takes a certain amount of time to return to the low resistance state. Therefore, if there are circuits that require continuous operation, sufficient time needs to be reserved to wait for PPTC to recover. 4. The work that needs to be matched with other components and equipment in the circuit, especially considering compatibility with components such as power supply and circuit protection. In summary, plastic encapsulated surface mount varistors have important application value as
Selection principles for plastic encapsulated patch varistors 1. Select appropriate Ur and IH based on the usage environment of the circuit and the components and equipment that need to be protected. Normally, Ur is slightly higher than the operating voltage of the circuit, while IH is appropriately controlled within the overcurrent protection range. 2. Select appropriate IT and Imax based on the rated current of the circuit. Normally, the rated current of IT and circuit is close, while Imax is controlled within the overload protection range. 3. Choose the appropriate Ro based on the power of the circuit, components, and the characteristics of the equipment itself. Normally, Ro should be kept as small as possible to ensure the proper functioning of the circuit. 4. Select appropriate Tw and Tr according to the usage environment and requirements of the circuit. Normally, Tw should meet the operating temperature range of the circuit under normal usage conditions, while Tr also needs
The breaking ability of fuses The breaking ability of a fuse is a safety indicator that has little to do with its electrical performance, and is often overlooked by manufacturers or users. Some people even do not know that fuses have breaking ability as a technical indicator. As a safety component, the fuse needs to ensure the safety of the circuit and other components at all times. Therefore, the first thing to ensure is that it is sufficiently safe in any situation, especially during the operation of the fuse, no unsafe factors can occur, including continuous arcing, re conduction, combustion, splashing, and explosion. Breaking ability is one of the indicators reflecting the guarantee ability of fuses. The parameter unit of breaking capacity is ampere, which means that the fuse can safely break the maximum current of the circuit. That is to say, as long as the overcurrent in the circuit does not exceed the breaking capacity of the fuse, the fuse can ensure the safe cutting off o
Analysis of factors causing fuse breakage 1. The concept of fuses Fuse, also known as current fuse, is defined as a "fuse link" in the IEC127 standard. When a circuit malfunctions or is abnormal, the current continues to rise, and the rising current may damage some important or valuable components in the circuit, or even burn out the circuit and cause a fire. If the fuse is correctly installed in the circuit, it will automatically melt and cut off the current when the current abnormally rises to a certain height and heat, thus protecting the safe operation of the circuit. 2. Working principle of fuse When current flows through a conductor, it will generate heat due to the presence of a certain resistance in the conductor. And the heat generation follows this formula: Q=0.24I2RT Among them, Q is the heat generation, 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 condu
The size of a 220 volt fuse should be calculated based on the power consumption of the device. According to Ohm's law, current equals power divided by voltage. Taking a 600 watt iron as an example, its current is approximately 2.8 amperes. If the current is too high during startup, multiply it by 1.5 and choose a 5 ampere fuse A 220 volt electricity requires a fuse, and the current is different. You need to choose the fuse according to the actual electrical appliance you are using. Generally, for a 1 kW appliance, a fuse of 5 amps or more is needed, and so on. For a 2 kW appliance, a fuse of 10 amps or more is needed. The higher the power of the electrical appliances used, the greater the current of the installed fuses. This requires determining the appropriate fuse size based on the actual overall power consumption.
1. It is voltage instability, which can cause electrical power frequency variation and result in frequency variation of the current passing through the fuse, causing the fuse to burn out. 2. It is due to the excessive use of electrical appliances with high power, exceeding the ability of fuses to pass current normally. 3. It was your place that underwent power line renovation, which allowed for an increase in current, but you did not replace the fuses with thicker ones accordingly. 4. It's just that the fuse itself is aging, used for too long, and passes through current for a long time. As we all know, fuses also have a certain resistance, so when passing current, they will heat up, become thinner and thinner, and the resistance will become larger and larger, ultimately leading to burnout. In addition, fuses may become thinner during long-term storage due to friction, slow air oxidation, and other reasons. 1. You can first use the appliances separately, that is, turn them on on
What is the function of a fuse in a circuit Fuses mainly play a protective role in circuits. In the event of a fault or abnormality in the circuit, as the current continues to rise and the rising electrode may damage certain important or valuable components in the circuit, it may also burn the circuit or even cause a fire. If the fuse is correctly placed in the circuit, it will melt to protect the circuit. The main function of a fuse in a circuit is overcurrent protection, also known as short-circuit protection. A fuse is a simple and effective protective device that primarily serves as a short-circuit protection in electrical circuits. Function of fuse: 1. Under normal circumstances, connect and disconnect the no-load and load currents in the high-voltage circuit 2. In case of system failure, it can cooperate with protective and automatic devices to quickly cut off the fault current, prevent the expansion of accidents, and ensure the safe operation of the system. 3. The functi
What is the significance of the breaking ability of patch fuses in practical applications? The breaking ability of patch fuses is a safety indicator that is not related to their electrical performance, so it is often overlooked by manufacturers or users, and some people even do not know the technical indicators of fuses having breaking ability. As a safety component, a fuse is required to ensure the safety of the circuit and other components at all times. Therefore, the first step is to ensure that it is sufficiently safe in any situation, especially when there are no unsafe factors during the operation of the fuse, including continuous arcing, re conduction, combustion, splashing, and explosion. Breaking ability is an indicator that reflects the guarantee ability of a fuse. The parameter unit of breaking capacity is ampere, which means that the fuse can safely break the maximum current of the circuit. That is, as long as the overcurrent in the circuit does not exceed the breaking
Do not confuse these two important concepts when choosing a fuse The two important concepts of fuses: thermal melting value and breaking capacity, as well as their differences and connections. Is the melting value of a fuse important? In short, this is very important. The melting value is to ensure that the heat generated by the fuse during a surge does not have enough time to conduct the heat from the fuse to the external circuit. Once the current I and time t are measured, the hot melt value I2t can be easily calculated. After the fuse is blown, it will generate an arc before disconnecting. For fuses, they can have the same rated voltage and current, as well as the same rated breaking capacity, in the same response time category (slow, medium, and fast). However, there are many options for hot melt values. Basically, the higher the melting value, the longer the fuse will take to melt, or the greater the surge that the fuse will withstand before melting. This is different from
Have you ever thought that behind the complex electrical system, there is a small component silently guarding your safety while driving your beloved car on the road? It is a car fuse. Although car fuses are small, they have a huge effect. Once an abnormality occurs in the circuit, it will melt immediately, preventing the current from continuing to flow and thus avoiding more serious damage. Our fuse products undergo strict quality testing to ensure that each fuse can perform at its maximum efficiency at critical moments. We offer a variety of specifications of car fuses, suitable for different vehicle models and applications. Whether it's daily commuting or long-distance travel, our fuses can provide you with reliable protection. Choose our fuses to keep your car in the best condition at all times.
In the world of cars, every tiny detail can affect overall performance and safety. Car fuses, this seemingly inconspicuous small component, are the invisible guardians that protect the entire vehicle's electrical system. Our car fuses adopt advanced processes and technologies, with the characteristics of high precision and high reliability. They can respond to circuit abnormalities in the shortest possible time, quickly cut off current, prevent electrical system overheating or short circuits, and protect your car from damage. Not only that, our fuses also have the advantage of being easy to install and replace, making it more convenient and efficient for you to use. Whether it's a new or old car, our fuses can provide you with the best protection solution. Choose our car fuses, so that your car can feel the meticulous care every time it is started. Safety is no small matter, details can be found in the real chapter. Let's work together to safeguard your beloved car.
Surface mount fuses can be divided into the following shapes based on their appearance and installation method: 1. Rectangle: This is the most common shape of surface mount fuses, usually with sizes such as 0402, 0603, 0805, etc. Rectangular patch fuses are suitable for various small electronic devices, such as mobile phones, tablets, etc. 2. Circular: This type of patch fuse is typically used in specific applications, such as circuits that require high voltage resistance or high current. The pin design of the circular patch fuse makes it more secure and reliable during soldering. 3. Alien: In order to meet the needs of special circuits, some surface mount fuses are designed in irregular shapes, such as L-shaped, U-shaped, etc. These irregular fuses have unique advantages in certain specific circuit layouts and can better adapt to complex design requirements.
The model and specifications of fuses are important reference for selecting and using fuses. The following are common fuse models and specifications: 1. Rated current: This is one of the most important parameters of a fuse, indicating the maximum allowable current of the fuse under normal operating conditions. When selecting a fuse, the rated current should be slightly greater than the maximum operating current of the circuit. 2. Rated voltage: Refers to the maximum allowable voltage of the fuse under normal operating conditions. If the voltage in the circuit exceeds the rated voltage of the fuse, the fuse may not function properly. 3. Breaking ability: This measures the ability of a fuse to cut off current in the event of a short circuit. The breaking capacity is usually expressed in amperes or kiloamperes, and the choice needs to be determined based on the actual needs of the circuit. 4. Resistance: Although the main function of a fuse is to protect the circuit, it also has a
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