Guidelines for Selecting Self Restoring Fuses and Disposable Fuses
How to choose between traditional disposable fuses and self restoring fuses, as there are significant differences between these two components? Next, we will provide a detailed introduction to the advantages of these two types of fuses, making it easier for everyone to better understand these two products and choose the fuse they need.
Many designs such as computers, peripheral devices, and portable devices (such as smartphones, tablets, etc.) require the use of self recovery fuses because the self recovery function provided by self recovery fuses is more suitable for use. If ordinary disposable fuses are used, they need to be replaced every time the circuit is abnormal or overloaded, and replacing fuses for these products is very troublesome. Therefore, using self restoring fuses on these products can not only protect the product's service life, but also improve usage efficiency.
The principle of self restoring fuses is to limit potentially harmful overload currents within a safe range. Specifically, excessive current flowing through the device can lead to an increase in internal heat (I2R), resulting in the heating of the self-healing fuse and an increase in its resistance. Before overheating occurs, the self recovery fuse resistance usually only accounts for a small portion of the total impedance of the circuit. The increase in resistance of polymer self recovery fuses has nonlinear characteristics, and such relatively large resistance will reduce or limit the current in the circuit to a safe range. The heat generated by the limited current with higher resistance will maintain the temperature of the self recovery fuse at a high level, resulting in high resistance.
The thermal balance condition will always be maintained until the circuit loses power, the self recovery fuse gradually cools down, and the resistance value decreases. The basic principle of the self recovery function of a self recovery fuse is that an increase in temperature will lead to an increase in resistance, and vice versa. Self recovery fuses achieve self recovery or return to a low resistance state by removing power from the circuit, thereby reducing the temperature of the device. Afterwards, the component can respond to future overloads at any time. If the root cause of the overcurrent problem is eliminated, the resistance will remain low; But when overcurrent occurs again, the device will switch back to a high resistance state.
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本文由三年不鸣转载自XC News，原文标题为:air conditioner fuse replacement.Guidelines for selecting self restoring fuses and disposable fuses，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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目录- Company Profile Fuse User's Manual Fuse Auto Fuse Fuse Holder Thermostat
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The Impact of Fuse Aging on Usage
After the fuse ages, there is no danger of generating the current that should be cut off and the fuse not blowing. The aging of a fuse is equivalent to a decrease in the rated value (current) rather than an increase, resulting in the circuit being cut off at a small overload current or pulse.
Temperature Characteristics of Current Fuses
Current fuses exhibit specific temperature characteristics that play a crucial role in their performance and reliability. The behavior of a current fuse in response to temperature changes is determined by several factors.
Littelfuse NPI Summary
型号- 54100 SERIES,SZSMF4L SERIES,483A SERIES,SP3022-01ETG-NM,59001,IXYK85N,LS0502SCD33,501A,LS05006VPQ33 SERIES,527 SERIES,HWB12 SERIES,MIDI® 498 IL SERIES,SP0115-01UTG,WLTM,658 SERIES,PXXX0S3N-A,IXTY2P50PA,LQ05041QCS6,WLTC,483,SP0115-01ETG,RCM,CG8 SERIES,LQ05022QCS4,PXXX0S3N-A SERIES,LQ05041QCS6 SERIES,483 SERIES,MIDI® 498,59143,DCNLB SERIES,IXYN110N120C4H1,SZSMF4L,CG9,CG8,IXYN110N,LQ05041RCS6 SERIES,WSTC,QS8004XHX,59155,HWB12,59156,54140,LS0504EDD12,10EV SERIES,MEGA® FLEX,IXTY2P50PA SERIES,WSTM,828,407A,PICO® II 521,LQ05041RCS6,LS24062RQ23,WPB,440A,IXYH30N,WPC,59040,3425L,LS24062RQ23 SERIES,SMF4L-T1G SERIES,LS0504EDD12 SERIES,AQ27COM-02JTG,SC24COM-01ETG,RCM SERIES,PXXX0S3N SERIES,828 SERIES,441A,IXYH55N,DCNLM,TPSMC SERIES,DCNLJ,DCNLH,DCNLB,FDA117,PGB2 0201,LS12052BD33,LS2405IDD23 SERIES,PXXX0S3N,LQ05021QCS4 SERIES,IXYH40N,IXYK85N120C4H1,408 SERIES,656 SERIES,LQ05021RCS4 SERIES,QVXX12XHX SERIES,SZ3KASMC,SV8012DRP,EVCC-01,LS12052BD33 SERIES,EVCC,ZCASE® FHZ,MIDI® 498 SERIES,AQ24COM-01,AQ3130E-01ETG,150520 SERIES,10EV,MATE-12B,WPB-A,TPSMB SERIES,QVXX25XHX,54140 SERIES,SP4338,DCNHR,QS8004XHX SERIES,3425L SERIES,881,LTKAK2-L,885,656 & 658,IXYN85N,526,527,408,AQ24COM-02,LPF,QVXX25XHX SERIES,CG9 SERIES,IXYH55N120C4H1,MDMB,SV8012DRP SERIES,MIDI® FLEX,HWB6 SERIES,MDMA,WPC-A,57041 SERIES,422A,L4CA-A,656,SV8012D,PGB2 0201 SERIES,IXYH30N120C4H1,526 SERIES,DCNHR SERIES,WJC-A,Q6035NAH5RP SERIES,20EV,LQ05021RCS4,AQ3118E-01ETG,TPSMC300A,SPDN,MEGA® 298,SP0115-01UTG SEREIS,LTKAK2-L SERIES,MIDI® 498 IL,SZ3KASMC SERIES,SP4338-02WTG,HWB6,MITI-7L,DSR,IXYN85N120C4H1,SP0115-01ETG SERIES,MISM-7L,CPC3981Z SERIES,MEGA® SN,DCNLJ SERIES,K12,MIDI® 498IL,MEGA 298,437A,DSR SERIES,150520,CPC3981Z,LQ05022QCS4 SERIES,SPDN SERIES,TPSMD400CA-A,LPF SERIES,ZCASE® FHZ SERIES,Q6035NAH5RP,57041,438A,TTP,WJC,LQ05021QCS4,DCNLH SERIES,SC24COM-01ETG SERIES,SMF4L-T1G,SSA,DCNLM SERIES,L4CA,TPSMC,L4CL-A,TPSMB,QVXX12XHX,483A,L4CC,TPSMD,LS2405IDD23,SSA SERIES,TPSMD SERIES,PICO® II 521 SERIES,MXB12R600DPHFC,LS05006VPQ33,54100,L4CL,IXYH40N120C4H1
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In automotive circuits, the selection of current fuses is of great significance for ensuring the safe operation of the vehicle. There are several key factors to consider when choosing a current fuse for an automotive circuit.
Professional Knowledge of Self-healing Fuses
The operating principle of a self-healing fuse is a dynamic balance of energy. The current flowing through the self-healing fuse generates a certain amount of heat due to the thermal effect of the current (self-healing fuses all have resistance values), and the generated heat is completely or partially dissipated into the environment. The heat that is not dissipated will increase the temperature of the self-healing fuse components. The temperature during normal operation is relatively low, and the heat generated and dissipated reaches a balance.
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The encapsulation of current fuses is an important aspect that affects their performance, durability, and safety.
Precautions for Using Fuses
The fuse is connected in series with the circuit, installed vertically, and installed on each phase line； Fuses are not allowed to be installed on the neutral line of a two phase three wire or three-phase four wire circuit.The power input terminal of the spiral fuse should be connected to the center point of the base, and the output wire should be connected to the threaded shell； This insurance is used in places with vibrations.
Common Sense for Fuses
A fuse refers to a self destructing fuse that experiences significant surges or other current exceeding limits in a circuit； In order to protect the components of other parts of the circuit where the fuse is located and the equipment is normal, the cost of replacing the fuse can be ignored compared to replacing the entire circuit that may be damaged. Due to the fact that fuses are a common element that needs to be replaced, we will introduce two basic concepts and provide a more in-depth introduction to fusion applications and testing and diagnostic methods.
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Current fuses play a vital role in smart meters. Firstly, they provide protection against overcurrent events. Smart meters are used to measure and manage electricity consumption accurately. However, electrical circuits can sometimes experience sudden surges in current due to various reasons such as power outages and subsequent restoration, short circuits in the electrical grid, or the malfunction of connected electrical appliances.
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Resettable current fuses offer a unique solution for protecting electrical circuits while providing the convenience of being reusable. Here‘s how they work.
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