Each type of circuit protection component has specifications, and self recovery fuses are no exception. So, what do you think when holding a self-healing fuse specification book? To put it bluntly, when reading the specifications, the main focus is on the parameters and the meanings they represent: I hold: Maintain current I trip: The maximum action time under the specified current; V max: Maximum voltage that can be withstood I max: Maximum current that can be withstood P d: Stable power consumption in high resistance state R: Zero power resistance measured at a certain temperature R 1max: The maximum resistance value measured at room temperature after one hour of action or soldering back Environmental temperature: The temperature of the still air around PTC Maximum working environment temperature: The highest ambient temperature for PTC safe operation
With the widespread application of self restoring fuses in the electronics industry in Shenzhen, we are paying more and more attention to the safety of electronic products. We need to know the performance of the products used Among the technical indicators of PPTC, one is Vmaxi, which represents the maximum voltage that the self recovery fuse protector can withstand in a blocked state. That is to say, in a circuit where the self recovery fuse is connected in series, when the current of the circuit is abnormal, the self recovery fuse will jump from low resistance to high resistance within a certain time range, thereby preventing the flow of abnormal large current and protecting the subsequent circuit from being damaged by large current. At this time, almost all of the voltage of the circuit is added to the self recovery fuse. If the voltage applied to the self recovery fuse exceeds Vmaxi at this time, it is easy to cause damage to the self recovery fuse, causing permanent damage a
There are many types of fuses, including classification by protection form, scope of use, volume, rated voltage, breaking capacity, and fusing speed. Below, we will introduce the classification by type, which can be divided into: current fuses: Shenzhen patch fuse, miniature fuses, plug-in fuses, and tubular fuses; Temperature fuse: RH square type, RP resistance type, RY metal case; Self recovery fuse: plug-in, laminated, patch. 1、 Current fuse Chip fuse. There are specifications such as 0805 and 1206, which use thin film technology to accurately control electrical characteristics. Due to its small size, it is an ideal choice for providing secondary protection for circuits in space limited applications, such as handheld portable electronic devices and various instruments and meters. 2、 Temperature fuse. It is an irreparable disposable thermal protection device, available in RH, RF, RY and other series. The product has a delicate appearance and structure, good sealing performanc
A relay is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic regulation, safety protection, and conversion circuits in the circuit. The function of a fuse is to: when a circuit malfunctions or is abnormal, the current continuously increases, and the increased current may damage some important or valuable components in the circuit, or burn the circuit or even cause a fire. If the fuse is correctly installed in the circuit, the fuse will fuse and cut off the current when the current abnormally rises to a certain height and time, thereby protecting the safe operation of the circuit. The relay can be 'off' or 'on' through current control, that is, it can be reconnected after being disconnected, while the Shenzhen fuse needs to be replaced after being disconnected, and programs cannot be used to reconnect it.
Is there a relationship between the self recovery fuse and the action time, and what is the action time? 1. The action time of the self recovery fuse is related to its internal resistance. The higher the temperature, the greater the current, and the higher the resistance value, and the shorter the action time of the self recovery fuse. In general, in official language, a self restoring fuse passes through 100% of its current in a room temperature of 25 ℃. However, if the rated current exceeds twice or more, the self restoring fuse will return to operation. 2. There are self recovery fuses available from a few seconds to tens of seconds, and the duration depends on the specific model of self recovery fuse used, as well as factors such as the characteristics of the fault. The sensitivity is not related to the price, but to the model of the self recovery fuse. The higher the current and voltage, the more expensive the price
1、 What is a self recovery fuse Self recovery fuse is an overcurrent electronic protection component that uses a polymer organic polymer under high pressure, high temperature, and sulfurization reaction conditions After mixing with conductive particle materials, it is processed through a special process. Habitually applying PPTC (Polymer Positive Temperature) Coefficent, also known as a self restoring fuse. Strictly speaking, PPTC is not a self restoring fuse, and Resettable Fuse is a self restoring fuse. 2、 Principle of self recovery fuse The self recovery fuse is made of high-tech polymer resin and nano conductive grains through special processing. Under normal circumstances, nano conductive grains The body forms a chain like conductive path along with the resin based link, and the fuse operates normally; When a circuit experiences a short circuit or overload, the large current flowing through the fuse causes its temperature to increase. When the Curie temperature is reache
MB:+86 13924633629 Ms.vicky
E-mail: waimao@xcfuse.com
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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
