Four elements to avoid when using self recovering fuses (PPTC) One: Avoid the significant mechanical stress of self recovering fuse chips Fuses will undergo thermal expansion of the polymer itself during operation. If under certain mounting conditions, the two ends of the device chip are subjected to significant pressure, compression, distortion, bending, etc., the thermal expansion phenomenon will be limited, thereby affecting the electrical function of the device, which will cause the protective device to be unable to operate under fault conditions. Secondly, to avoid short circuits in non packaged devices Is there any conductive object contamination between the edge of the self-healing fuse device and the bracket when using a non encapsulated PPTC device. This non encapsulated conductive object pollutant can cause faults such as oxidation and combustion. Thirdly, several points to pay attention to when soldering components When wave soldering or reflow soldering is required,
Why use PPTC self recovery fuse? 1. Self recovery capability: PPTC fuses have the characteristic of self recovery, which means that once the overload condition disappears after triggering the overload protection, they will automatically resume normal operation. This feature makes PPTC fuses more durable and economical than traditional fuses, as they do not require frequent replacement. 2. High response time: The response time of PPTC fuses is very fast. Once there is a fault condition such as overload or short circuit in the circuit, the PPTC fuse will be immediately triggered, disconnecting the circuit and avoiding potential danger and damage. 3. Compact size: PPTC fuses are usually much smaller in size than traditional fuses, which is particularly useful in compact electronic devices. They are suitable for compact and high-density circuit board layouts, providing greater flexibility and space savings. 4. Environmental protection and energy conservation: As PPTC fuses can be reu
What material is used to make self recovering fuses (PPTC) Self healing fuse (PPTC) is an electronic component used for overload protection, which can isolate current overload and automatically restore normal working state after the overload disappears. The PPTC fuse is made of a special polymer material, and under overload conditions, its resistance will quickly rise, limiting the passage of current. This article will provide a detailed introduction to the materials, manufacturing processes, and characteristics of PPTC fuses, as well as their applications in the field of electronics. PPTC fuses are mainly composed of thermistor materials, insulation materials, and conductive materials. Among them, thermistor material is the core component of PPTC fuse, which has temperature response performance. When current passes through a fuse, heat is generated inside the material, causing the temperature of the thermistor material to rise. When the temperature exceeds the triggering temperatu
The difference between polymer PPTC and ceramic CPTC Positive temperature coefficient thermistor PTC (also known as self recovering fuse) is an overcurrent and over temperature protection component, which can be divided into two categories according to manufacturing materials: organic polymer PPTC and ceramic PTC (CPTC). Polymer PPTC is formed by extruding high molecular weight polymer into carbon powder. Carbon powder forms carbon chains for conductivity, and when heated, the polymer expands, causing the carbon chains to break and form high resistance. Ceramic CPTC is made by high-temperature sintering of barium titanate powder with positive temperature coefficient characteristics through electronic ceramic technology. Their commonality lies in their recoverability, which can be reused more than 6000 times. The main advantages of polymer PPTC are: zero power resistors at room temperature can be made very small, high current products only have a few milliohms, low power consumptio
Four elements for avoiding the use of self recovering fuses (PPTC) The first element is overcurrent protection. PPTC is a very effective circuit overcurrent protection component. Under normal circumstances, PPTC exhibits a low resistance state, which can ensure the normal operation of the circuit. However, when the current exceeds the safety limit, PPTC will rapidly heat up, the material will undergo a phase transition, and the resistance will rapidly increase, thereby cutting off the circuit. This can effectively prevent damage to circuits and equipment caused by excessive current, and protect the safe operation of the entire system. The second element is self-healing property. A significant feature is the self recovery property of PPTC. Once the current exceeds the safety limit, PPTC will automatically cut off the circuit and return to a low resistance state after the overcurrent disappears. This means that when the circuit load returns to normal, PPTC can automatically restore p
The protective effect of PPTC mainly relies on the following aspects 1. Material characteristics: The material used in PPTC is a polymer composite material that has a certain degree of conductivity and can normally allow current to pass through. However, when overheating occurs, the volume of the material rapidly expands, causing the polymer to melt and interact with the conductive filler, resulting in instantaneous high resistance. This feature enables PPTC to quickly cut off current and provide protection. 2. Thermal sensitivity: The material of PPTC has thermal sensitivity, and when current passes through PPTC, the material will generate heat due to resistance. When the current is too high, the temperature of the material will increase. When it reaches a certain threshold, the material will undergo a change in phase transition properties, which will quickly cause an increase in resistance. This thermal sensitive characteristic enables PPTC to respond promptly and quickly cut off
Short circuit protection solution for lithium-ion battery packs Lithium ion batteries are at risk of internal short circuits due to various factors such as material systems and manufacturing processes. Although lithium-ion batteries undergo strict aging and self discharge screening before leaving the factory, there is still a certain probability of failure due to process failures and other unpredictable usage factors, leading to internal short circuits during use. For power batteries, there are hundreds or even tens of thousands of lithium-ion batteries in the battery pack, greatly increasing the probability of internal short circuiting in the battery pack. Due to the enormous energy contained within the power battery pack, the occurrence of internal short circuits can easily trigger malignant accidents, resulting in casualties and property losses. TE's PPTC and MHP-TA series products provide a possible solution to prevent malignant accidents in the event of an internal short circui
self recovery fuse will still activate protection again after being powered on again. Here are a few knowledge points about self-healing fuses that need to be sorted out: 1. Self recovering fuses are different from traditional one-time blown fuses, as they can protect circuits multiple times without the need for disassembly and replacement. 2. After the self recovery fuse is activated for protection, the circuit is not completely interrupted, and there is still a small current in the circuit. The current is very weak, which can keep the self recovery fuse in a protected state. At this time, other devices on the circuit cannot work. 3. The main changes before and after the self recovery fuse starts protection are that the temperature before protection is at room temperature, and after protection, the temperature rises, and the internal temperature reaches 130 ℃. 4. After the self recovery fuse is activated for protection, the equipment stops working and needs to be manually power
Characteristics of PPTC fuses 1. High power-off capability: PPTC fuses can provide high power-off capability in a small volume. They can withstand high currents, ensuring the normal operation of the circuit while protecting it. 2. Low voltage drop: PPTC fuses have the characteristic of low voltage drop and will not cause energy loss under normal working conditions. 3. Wide working temperature range: PPTC fuses can work normally in a wide temperature range and adapt to the needs of different environments. Disadvantages of PPTC fuses 1. High internal resistance: Due to the self recovery characteristics of PPTC fuses, their internal resistance will significantly increase in the protected state. This may have a certain impact on the performance of the circuit, especially in applications that require low resistance. 2. Trigger time delay: Although PPTC fuses have a relatively fast response time, their trigger time may be delayed compared to traditional fuses. In applications where r
Application scenarios of different types of fuses According to different classification standards, fuses can be classified into various types, including by shape, by purpose, by current capacity, etc. The following are several common types of fuses and their application scenarios: 1. Glass tube fuse: This type of fuse is typically used for small electronic devices such as radios, televisions, and computers. Its characteristics are small size and fast reaction speed. 2. Ceramic fuse: This type of fuse has high voltage resistance and current capacity, and is commonly used in high-voltage and high current situations, such as power transformers and distribution cabinets. 3. Car fuses: Car fuses are specifically used for protecting car circuits and are usually installed near the car battery or under the dashboard. Its characteristics are high temperature resistance and good seismic performance. 4. Slow melting fuse: This type of fuse is suitable for protecting inductive loads such as
The working principle of fuses A fuse is an electrical safety device used to protect circuits from damage caused by overcurrent. Its working principle is based on the accumulation and release of thermal energy. When current passes through a fuse, heat is generated due to the resistance of the fuse material. If the current exceeds the predetermined threshold, the heat generated will cause the temperature of the fuse to rise rapidly, ultimately leading to the fuse melting and cutting off the circuit. The core part of a fuse is a thin wire or sheet made of silver copper alloy with high resistivity and low melting point. This design ensures that the fuse can conduct electricity normally under normal current conditions; In the case of excessive current, the fuse can quickly melt, protecting other components in the circuit from damage.
How to choose the appropriate fuse Choosing the appropriate fuse requires consideration of multiple factors, including the operating voltage, operating current, load type, and environmental conditions of the circuit. Here are some key steps when choosing a fuse: 1. Determine the maximum current of the circuit: This is the basis for selecting the rated current of the fuse. The rated current of the fuse should be slightly greater than the maximum operating current of the circuit to avoid frequent melting. 2. Consider the voltage of the circuit: The rated voltage of the fuse should be greater than or equal to the operating voltage of the circuit to ensure its normal operation. 3. Choose the appropriate type: Select fuses of different types and specifications according to the specific needs of the circuit. For example, for inductive loads, slow melting fuses should be selected; For high-frequency circuits, fuses with fast response times should be selected. 4. Consider environmental
What is the relationship between Ih and It in the parameters of self recovering fuse products PPTC stands for Polymer Positive Temperature Coefficient, which means high polymer positive temperature coefficient device in Chinese. It is a type of PTC thermistor. When the current surge is too large or the temperature is too high, the resistance of the device will sharply increase, which can enter a high resistance state and achieve the effect of limiting the current. After troubleshooting, the resistance value automatically recovers and returns to a low resistance state, so it is also called a self recovering fuse or a recoverable fuse. Product features, benefits, and disadvantages: limiting the current to a safe level, it can be repeatedly protected about 6000 times, does not need to be replaced, reduces the cost of guarantee and service, can be used with peace of mind, is easy to install, and is ideal for use in subtle situations. PPTC has two current parameters, one is Ih, which
Overcurrent and Overvoltage Protection of Relays Relays are widely used in the consumer electronics industry and industrial equipment. They have control systems (also known as input circuits) and controlled systems (also known as output circuits). They are actually an "automatic switch" that uses small currents to control large currents. Therefore, they play a role in automatic regulation, safety protection, and circuit conversion in circuits. Relays may be damaged due to overcurrent or overvoltage, and consist of one or several pairs of contacts and windings. When current flows through the winding, the contacts will open or close. When the relay interrupts the current flowing to the inductive load, voltage spikes occur, which is a common problem. In severe cases, voltage spikes can exceed the rated voltage of the relay contacts, causing damage to the contacts. It may be suddenly damaged and severe, or very slowly, and will only manifest after many years. In addition, when the co
RS485 communication interface application self recovery fuse PPTC (Self Recovering Fuse), as we all know, has a wide range of applications and is often used as a current limiting protection device in portable computers, automotive electronics, communication interfaces, and electronic industrial control equipment. Of course, self recovering fuses are also one of the most widely used overcurrent protection devices we currently know of. So, how is the protective effect it can provide actually achieved? Our common communication interfaces include RS232, RS485, etc., both of which are popular communication interfaces in the market, especially RS485. When the communication speed is 100kbps, its communication distance can reach over 1200 meters, and it also has a good signal-to-noise ratio. At the same time, its price is also relatively advantageous. However, due to its long-term exposure to outdoor environments and complex working voltage of only 5V, it is prone to damage when facing E
What issues should be considered when selecting self recovery fuses The selection of self recovery fuses should consider the following issues: 1) What is the voltage value at both ends of the PPTC component in series in the circuit? 2) What is the average current value flowing through the pptc components of a circuit under normal operating conditions? 3) When a load short circuit occurs in a circuit, to what extent will the fault current in the circuit increase, causing damage to the circuit or other components in the circuit? The maximum limit current, such as protection circuit, when the circuit load and fault current increase to 10 amperes, the circuit or components in the circuit are damaged, affecting the normal operation of the circuit. PPTC components need to quickly protect the circuit, and the current value at this time is the limit current value. 4) What is the ambient temperature of the circuit? (Because pptc components belong to positive temperature coefficient ther
The development of fuses The development of fuses can be traced back to the late 19th century, and the earliest fuses were made of simple metal wires. With the advancement of electrical technology, the design and materials of fuses are constantly improving. The following are some important stages in the development of fuses: 1. Early development: Early fuses were mainly made of lead antimony alloy, which had a low melting point and good conductivity. But due to the toxicity of lead, this type of fuse is gradually being phased out. 2. Modern fuses: Modern fuses are mainly made of silver copper alloy, which not only has good conductivity and melting characteristics, but also is more environmentally friendly. In addition, the structure of fuses has become more complex and diverse to meet the needs of different application scenarios. 3. Intelligent trend: With the development of electronic technology, intelligent fuses have begun to appear. This type of fuse can not only achieve over
How to replace car fuses? Replacing car fuses is a relatively simple but very important maintenance task. The correct replacement steps are as follows: 1. Prepare tools: Usually only a small screwdriver or a specialized fuse removal tool is needed. 2. Turn off the engine and all electrical equipment: Ensure that the vehicle is turned off and all electrical equipment (such as lights, audio, etc.) is turned off. 3. Find the fuse box: Most vehicles' fuse boxes are located under the dashboard or engine hood in the cockpit. The specific location can be found in the vehicle's user manual. 4. Identify faulty fuses: Open the fuse box and check the status of each fuse. A faulty fuse usually has a clear broken line. 5. Remove the faulty fuse: Use a screwdriver or specialized tool to gently clamp both ends of the fuse and pull it out. Be careful not to apply too much force to avoid damaging the fuse box. 6. Install a new fuse: Select a new fuse with the same rated current and insert it i
What are the alternatives to fuses? In some cases, it may be necessary to seek alternatives to fuses, especially in emergency situations or when there are no suitable fuses available. Here are some common fuse substitutes: 1. Circuit breaker: A circuit breaker is a reusable electrical protection device that can automatically disconnect the circuit when the current is too high. Unlike fuses, circuit breakers do not require replacement and only need to be reset. 2. Self healing fuse: This type of fuse will automatically disconnect in case of overcurrent, and once the current returns to normal, it will restore the connection on its own. This type of fuse is commonly used in circuits that require frequent protection. 3. Semiconductor protection devices, such as TVS diodes and MOVs (varistors), can protect circuits under transient overvoltage conditions and are commonly used for protecting power and communication lines. 4. Relays: In certain special circumstances, relays can be used
Resettable fuse selection 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 and Imax are greater than or equal to
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
