【经验】一文解析保险丝的选型方法

时间： 2022-09-13 来源：华德电子

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保险丝作为过流保护器件，主要对电路、用电设备发生短路、过载等状况进行保护，使用过程中通常应达到“该熔断时应及时熔断，不该熔断时不能熔断，熔断时要能安全熔断”的效果，因此对于保险丝的选型需要谨慎对待。本文中华德电子将为大家解析如何选择保险丝（电子熔断器）。

在保险丝的选型过程中需要综合考虑在运用保险丝的电路、用电设备中的相关因素及条件，实际选型通常会通过以下步骤来完成：

步骤一：确认电路相关参数

步骤二：选用保险丝的尺寸型状

步骤三：选用所需安规认证

步骤四：选用保险丝的额定电压（额定电压≧最大工作电压）

步骤五：选用保险丝的分断能力

步骤六：选用保险丝的额定电流（额定电流＞最大工作电流）

1. 考虑安全衰减率

2. 考虑温度衰减率

步骤七：考虑电流脉冲

1. 考虑I^2t 衰减率

2. 以慢断型保险丝为主要选型对象

步骤八：选用保险丝的时间电流特性

步骤九：实际安装测试

确认电路相关参数

电路稳态工作电流Irms；

电路工作电压（交流or直流）U；

工作的环境温度Tm；

要保险丝熔断的异常情况的电流大小及时间参数（短路、过载、三相应用出现断相）

不允许保险丝熔断的浪涌电流大小及时间参数（开机浪涌、雷击浪涌、上电浪涌、开关转换浪涌等）

选用保险丝的尺寸、外形、特性

实际产品空间允许的保险丝长、宽、高；

插件or贴片、管状保险丝是否要带引脚、不带引脚管状需用Fuse Holder，Fuse Holder有什么要求；

熔断特性的要求，快断还是慢断；

外观、标识有无特殊要求；

选用所需安规认证

需要保险丝具有哪些安规认证

选用保险丝的额定电压Un

保险丝的额定电压Un ≥ 电路工作电压U

选用保险丝的分断能力BC

保险丝的要保证电路故障状况下能安全分断，分断电流应大于故障电流

选定保险丝的额定电流In

考虑安全衰减率

•美规制品（UL标准）：保险丝额定电流（In）=回路最大稳定电流/0.75

•欧规制品（ICE标准）：保险丝额定电流（In）=回路最大稳定电流/0.90

•日规制品（JIS标准）：保险丝额定电流（In）=回路最大稳定电流/0.85

使用环境温度衰减率

• 根据规格书内温度-电流曲线图，确定工作环境温度下的折减率

确定电路工作过程中存在的浪涌参数，以能量最大的作为选型参考，计算浪涌I2T。评估保险丝需要耐受浪涌冲击的次数，确定浪涌I2t值与所需保险丝的I2t值之比，确定需要的保险丝I2T

根据上述因素确定需要的保险丝额定电流In

保险丝的时间电流特性

实际安装测试，根据实装测试的情况，适当调整选定规格

选型示例：

要求如下：

• 表面绝缘或套管

• 有VDE/UL/CQC认证

• 电压范围：94V~264V

• 短路电流未知，需保证不炸

• 工作及冲击电流如上

• 需保证承受10万次浪涌冲击

• 工作环境温度60度左右

根据以上条件，我们对其逐一进行分析：

1、整机的正常工作电流 I_RMS=1.072A，额定电流为I_B

I_B=I_RMS/75%=1.072A/75%=1.429A

2、因客户在60℃环境温度情况下使用，参照温度折减率曲线图，约有4%左右的衰减（衰减到原来的96%），则保险丝的额定电流为I_RATED

I_RATED=I_B/96%=1.429A/96%=1.489A。

3、考虑承受脉冲电流 Ipulse=27.4A ，Tpulse=20ms。根据“脉冲电流的I²T值”, 此电流脉冲的与F波形较为接近, 则：

W_PULSE=(1/2)I_A²T

W_PULSE=(27.4×27.4×0.02)/2A²Sec=7.51A²Sec

4、保险丝要能承受此脉冲冲击10万次冲击。根据“电流脉冲承受次数”,保险丝I²T值大于或等于电路脉冲I²T值的22%, 则：

W_RATED≧A/22% =7.51A²Sec/22%=34.1A²Sec

根据以上计算： I_RATED=1.489A，W_RATED=34.1A²Sec

结论：依额定电流及I2T计算可推荐ICP2.5A或2010T2.0A；ICP2.5A分断BC能力为35A250VAC，客端短路测试会有问题。推荐选用：2010T2.0A（BC130A250VAC）

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本文由carat转载自华德电子，原文标题为:保险丝（电子熔断器）选型指南，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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型号- 45302.5,0977016.XEP,03540903ZXGY,0154.125,03540821ZXBL,0482 0007ZXB,03540911ZXGY,01550009ZXA,111 501,111 505,111 506,0454003.,0454001.,01550009ZXU,3453HS3-010,03540001ZXGY,800,801,03540806ZXGY,802,454007,803,804,454005,454004,0477016.XEP,454003,0454002.,807,808,0482 0019ZXB,015401.6,015401.5,0100 0054,208 000P,0977.800XEP,0216 000XP,154.315,820 20,0453.250,0215.125XEP,345 101,225 000P,810,811,640 0000 1603,813,814,815,816,0482 0007ZXP,559 0000 00 01,0154.375,0275025.,121004,282008,65800001XXX,121001,282007,820,121002,821,282002,0100 0058,823,824,282001,0100 0056,3453LF2-010,03540912ZXGY,154.375,0216.800XEP,03540807ZXGY,100 058,0453002.,0453.080,100 054,100 056,01550114ZXA,830,03540902ZXGY,831,0281 0008H,0107 0002,853 0000 1009,834,0454007.,835,837,0477.800XEP,279 000,154.125,0106 0001,216SP,800 01,0154.315,101001,0482 0001ZXPF,0215001.XEP,0453003.,0482 0019ZXP,562 0000 1009,3453HS4-010,01550114ZXU,454002,454001,015403.5,453.062,02450002X,3453LF1-010,65800003XXX,0154.100,850,0482 0009ZXB,851,852,853,855,856,0454005.,02450002H,129 002,0213 000P,129 001,01550020ZXA,0100 0020,0482 0020ZXB,314 000P,866 0000 1009,02450001X,0453001.,15403.5,3453LF1-020,0281 0007H,0482 0020ZXP,0453.062,154.750 T,860,862,865,03540010ZXGY,866,837 0000 0005,02450001H,01550020ZXU,0454004.,0520 0005 ZXGY,313 000P,824 0000 0005,125002,125001,0213 000 XEP,870,03540808ZXGY,874,875,876,877,PICO 259,0217.315 XEP,3453LF4-010,0154.750,0453007.,649 0000 3039,0285.125 XRP,127 002,0281 0005H,640,816 0000 0005,655 0000 0405,400,646,648,649,0482 0015ZXP,127 001,0482 0009ZXBF,0217.400 XEP,815 0000 0005,342 058,52100001009,830 0000 0005,0453004.,01550104ZXU,0482 0002ZXPF,652,653,0482 0005ZXB,655,0482 0010ZXPF,656,101002,658,101003,646 1200 7113,659,01550104ZXA,03540011ZXGY,451.1,03540901ZXGY,0453005.,342 048,660,824 0000 0205,429,0215020P,0482 0017ZXB,649 0000 1039,435,437,438,659 0000 0009,0482 0005ZXP,0451.062,440,441,443,202,203,445,254 121,446,688,447,448,449,208,209,646 1200 7123,154001. T,0482 0003ZXPF,0154.500,0453008.,824 20,451,452,453,0520 0001,354 101-GY,454,213,456,215,03540012ZXGY,458,216,459,217,218,453.1,453.2,03540809ZXGY,453.8,453.5,0520 0004 Z,453.4,460,3453LF3-010,461,0451.080,312 000,462,220,464,465,0482 0008ZXBF,466,224,467,225,468,469,254 101,229,800 0000 0105,0482 0017ZXP,560 0000 13 19,01000020Z,471,230,472,0101 0001,473,232,233,0356 0011Z,234,477,235,239,125 001,125 003,570 0000 0001,125 002,0445 0001,03540601ZXGY,154002. T,109 002,345_ISF,02200029MXP,0281 0001,109 001,481,482,0101 0002,242,485,0101 0003,0482 0016ZXBF,04533.15,245,0356 0010Z,0215020.XEP,01550004ZXA,102064,345 101-010,0482 0002ZXB,0482 0002ZXP,03540005ZXGY,803 01,251,494,253,254,0122 055Z-1,348 677,354 700,01550004ZXU,348 671,03540101ZXGY,0482 0019ZXPF,15401.5 T,03540906ZXGY,3453QS2-010,0216.050XEP,345 101-020,03540803ZXGY,262,102071,263,265,266,267,268,520 001,269,520 003,520 004,PICO 259-UL913,0482 0007ZXBF,0235006.XEP,0482 0004ZXPF,0218 000P,272,030,273,274,03540602ZXGY,275,154.8,262 000,278,0239 000P,279,505 000P,0453.630,154.1,0154007.,0482 0014ZXP,154.5,154.4,154004. T,155 100,154.2,3453QS8-010,01550014ZXA,340 313,0482 0014ZXB,281,282,01550120ZXU,340 312,285,286,155 004A,348 600,04611.25,0453.400,852 0000 1009,01550120ZXA,045306.3,0281 0008 H,1541.25,268 000,811 0000 0005,01500145HXB,01550014ZXU,0482 0017ZXBF,348 877,155 114A,0218.032 XEP,3453QS3-010,278 000,348 871,640 0000 1003,658 0000 1109,0482 0001ZXBF,03540004ZXGY,155 004U,220 000P,58300000005,831 0000 0005,0482 0006ZXBF,451.125,03540907ZXGY,0482 0005ZXPF,155 006A,0154008.,03540802ZXGY,155 114U,00300210M,155 006U,850 0000 1009,0254 0002Z,344 125,658 0000 4009,0482 0010ZXP,045402.5,01550109ZXU,03540905ZXGY,0154003.,0482 0010ZXB,3453LF8-010,01550006ZXU,00300210N,3453QS7-010,0254 0003Z,0232 000P,03540003ZXGY,0482 0002ZXBF,0482 0009ZXP,0154002.,348 800,0482 0009ZXPF,0154.080,0453.200,3453RF8-010,01550100Z,0359 0010Z,315 000P,03540603ZXGY,3453HS1-010,02810001H,520_W,332 000P,224 000P,66000001009,508 000P,0154005.,0477.500XEP,325 000P,155 009A,3453QS4-010,0359 0011Z,0482 0018ZXBF,0254 0001Z,453.315,851 0000 1009,155 009U,15401.6,286 377,15401.5,0482 0021ZXPF,45403.5,0154004.,01550109ZXA,0359 0012Z,653 0000 0405,0482 0008ZXPF,154.375 T,3453LF7-010,454.375,0216001.XEP,835 0000 0005,322 000P,03540805ZXGY,345 121,658 0000 3109,652 0000 0405,03540002ZXGY,266 000,0275030.,154L,02200019MXP,03540604ZXGY,045302.5,281010,03540904ZXGY,208 000EP,0482 0003ZXBF,453.75,45303.5,0216016.XEP,0482 0020ZXPF,0154001.,3453HS2-010,354 900,281007,154T,281008,281005,0482 0012ZXB,0482 0012ZXP,640 0000 1403,03540804ZXGY,51800001009,453.63,0482 0019ZXBF,0356 0012Z,45401.5,0154.062,834 0000 0005,01550006ZXA,0217015 XEP,453.125,344 400,015402.5,0218.125 XEP,0254 0204Z,344 405,230 000P,344 402,0482 0007ZXPF,344 401,0453.160,344 404,344 403,0482 0004ZXBF,0233 000P,0482 0018ZXP,0154.250,0482 0015ZXPF,265 000,354 000,209 000EP,801 0000 0005,453.08,640 0000 1503,0520 0101 Z,03540008ZXGY,0482 0018ZXB,0254 0205Z,810 0000 0005,571 0000 0001,

LITTELFUSE - 选型指南 - 2018年11月代理服务技术支持批量订货

为您揭秘：熔断器是保险丝吗？

保险丝是熔断器，但熔断器未必是保险丝。熔断器作为电路保护的重要组成部分，在现代电气系统中发挥着不可忽视的作用。了解其基本原理、结构以及在实际应用中的选择与安装方法，对保障电路的稳定运行至关重要。

2024-10-31 - 技术探讨代理服务技术支持批量订货

AEC-Q200新版车规保险丝等过压/过流/防静电/防雷保护器件

世强硬创联合Littelfuse、ECE、硕凯、扬杰科技、MTA、PANJIT、SEMITEC等厂牌带来AEC-Q200新版车规保险丝等过压/过流/防静电/防雷保护器件，提供多种选择的电路保护解决方案，帮助客户优化设计。

2023-09-26 - 活动

竞沃（TLC）三端保险丝选型指南

描述- 竞沃电子成立于 2011 年，连续三届被评为国家高新技术企业，是国内第一家贴片自恢复保险丝生产商，PPTC 行业领先者，电路保护元器件专业制造商。主营产品包括 PPTC、FUSE、TVS and ESD、NTC、WSF 三端保险丝、熔断器等过流过压保护元件。

型号- WSFB1550,WSFD4550,WSFB2204,WSFC1514,WSFB1514,WSFD4512,WSFB1512,WSFD4514,WSFD4550-C17,WSFB2240,WSFD9550 30A,WSFB1240-C9,WSFB1232,WSFC3020,WSFD 30A,WSFB1508,WSFC3030-C8,WSFB1504,WSFD 45A SERIES,WSFC1524,WSFC1204,WSFDXXXX,WSFD 30A SERIES,WSFC1520,WSFC3024,WSFC3050-C14,WSFB2212,WSFB1240,WSFD4540,WSFB2214,WSFC SERIES,WSFD3050,WSFD9550 45A,WSFB1524,WSFB1204,WSFD3018,WSFB2250,WSFD3012,WSFB1520,WSFB,WSFC,WSFC3012,WSFD,WSFD4550-C20,WSFD 45A,WSFC3050,WSFB2208,WSFC1512,WSFC3014,WSFB2224,WSFB1250,WSFD3040,WSFD3006,WSFB1214,WSFB1532,WSFB1212,WSFD4530,WSFB2220,WSFD3040-C12,WSFD3004,WSFD4532,WSFC1250-C14,WSFC3040,WSFD3050-C16,WSFB1208,WSFD3050-C17,WSFC3008,WSFD9550 45A SERIES,WSFC3004,WSFC1220,WSFD9550 30A SERIES,WSFD SERIES,WSFB1220,WSFD3030,WSFCXXXX,WSFD3032,WSFB SERIES,WSFC1208,WSFD4524,WSFB1224,WSFD4520,WSFB1540,WSFC1250,WSFBXXXX,WSFB1532-C7,WSFC3030,WSFC1214,WSFC1212,WSFB1232-C7

2023/1/31 - 竞沃 - 选型指南 - REV.1 代理服务技术支持批量订货

硕凯一次性熔断保险丝SCMTS1630A配合后端过压保护器件，在单板电源电路中发挥出色的浪涌组合防护效果

本文主要针对AC220V 电源电路过差模雷击4KV为标准，实测一次性熔断保险丝SCMTS1630A在AC220V电路防护方案以及差模4KV时的残压波形图。硕凯一次性熔断保险丝SCMTS1630A能通过浪涌4KV测试而不损坏，在起到过流和短路保护的同时，能更好的配合后端过压保护器件，发挥出色的浪涌组合防护效果。

2024-10-25 - 应用方案代理服务技术支持批量订货

德尔电子保险丝选型表

目录- 熔断器

型号- HBB-200LMP,HBB-200LMT,DNQ-A-100,HBB-63LEP,HBB-63LET,DNN-P-400,DNN-C-225,DNN-X-325,HEV-P-Q-500,DNN-H-500,DNN-H-60,HBD-40EPL,HBD-40EPJ,HBD-50LEP,DFN-E-50,HBD-50LET,DNN-C-450,HPJ,DNN-P-425,HBD-160LMP,HPL,HBD-160LMT,HBD-40ETL,HBD-40ETJ,DNN-X-100,DFN-E-40,HBB-100LEP,DNN-C-200,HBB-100LET,HEV-H-Q,DNN-H-80,HBD-250ST,DNQ-A-125,HBD-250SM,DFN-E-30,DFN-H-7.5,DFN-A-5,DNN-P-200,DNN-H-35,DFN-A-4,HEV-P-Q-700,DFN-A-3,DFN-A-2,DFN-A-1,HBD-40HT,HDP6XX,BS88-HBD,EP,HBD-40HP,ET,DNQ-A-150,STTJ,HBD-110EEP,HBD-315SML,HBD-315SMJ,HBD-110EET,STTL,HTJ,HBD-250LMT,HBD-40EP,HTL,DNN-H-50,DNN-C-250,HBD-40ET,HBD-250LMP,HBD-280STJ,DNN-X-300,HBD-450STT,HBD-280STL,HEV-J-Q-5,DNN-P-225,DNN-H-40,HEV-A-Q-700,HBD-20EPJ,DNQ-A-175,MEV-P-C30,DNN-P-450,HBD-225SML,HW2,HW1,HP,DFN-X,HBD-315SM,HT,HBB-63LMP,HBD-315ST,HBB-63LMT,HEV-P-Q-100,HBD-20EPL,HBD-32EPJ,DFN-H,HBD-32EPL,DFN-E,DFN-A,HBD-200HP,HBD-80HPL,MEV-J-G00,DNN-E-250,MEV-J-G03,DNN-X-150,HEV-J-Q-250,HBD-80HPJ,HBD-200HT,SMJ,SML,HBD-500LMT,HBD-350STJ,HBD-500LMMT,HBD-500LMMP,HBD-160LEP,HBD-160LET,HBD-140EETJ,HBD-140EETL,HBD-100ET,HEV-P-Q-325,HBD-100EP,HZ1,HZ3,HZ2,HZ5,HBD-630STT,HZ4,HZ7,DNN-E-275,HZ6,HBD-20ETL,HEV-J-Q-275,HBD-20ETJ,DNN-P-250,DNN-X-175,HBD-350STL,HEV-H-Q-175,HBD-225SMJ,HBD-20EP,HEV-J-Q-200,DNN-X-125,HEV-P-Q-300,HBD-350SMJ,HBD-350SML,HBD-20ET,HBD-32ETJ,HBD-32ETL,HBD-400ST,DNN-E-450,HBD-80HTJ,HEV-J-Q-450,HBD-80HTL,HBD-100HP,HEV-H-Q-150,DNN-X-350,HBD-400SM,DNN-E-200,HBD-100HT,DNN-P-275,HRP70,HEV-P-Q-M400,HBD-315STL,HBD-140EEPJ,HBD-315STJ,HD10PV,HBD-140EEPL,DFN-X-7.5,HEV-H-Q-125,DNN-C-400,HEV-J-Q,HEV-J-Q-225,HBD-700STT,DNN-X-130,HBD-280SML,HBD-56EPJ,HBD-280SMJ,HBD-56EPL,DNN-E-225,DKN-A-5,HBB-550LMP,DKN-A-4,DKN-A-3,DKN-A-2,DNN-C-60,DFN-A-25,HEV-A-Q-1000,STJ,STL,DNQ-A-60,HEV-P-Q,HBD-32LEP,HEV-H-Q-100,HBD-32LET,DFN-A-20,MEV-J-D20,MEV-J-F63,HEV-A-Q-125,MEV-J-D23,DNN-C-50,DFN-A-15,HD604,HD605,HD602,HBD-80HT,HD603,HBD-550SMML,HD601,DNQ-A-70,HBD-80HP,HBD-550SMMJ,DNN-E-400,DKN-A-30,DFN-A-10,HEV-H-Q-350,MEV-J-F60,MEV-J-F73,DKN-A-25,DNN-C-80,DKN-A-20,HBD-80ET,DNN-H-275,HD615,DNQ-A-40,HD616,HD613,HD614,HEV-A-Q-350,HBD-80EP,HD611,HD612,HD610,DFN-H-1,HD608,DFN-H-5,HD609,DFN-H-4,HD606,DFN-H-3,HD607,DFN-H-2,SM,MEV-J-F70,MEV-J-D30,ST,HBD-100ETL,DKN-A-15,HEV-H-Q-325,DKN-A-10,DNN-C-70,HBB-400LMP,DNQ-A-50,HEV-A-Q-100,HBB-400LMT,HEV-J-Q-300,HEV-P-Q-275,HBD-56ETJ,HD617,HD618,HBD-56ETL,HBD-180STL,HBD-180STJ,HBD-50HPJ,HBD-200ST,HBD-50HPL,HEV-H-Q-300,HBD-200SM,MEV-J-H60,MEV-J-H63,HBD-500STTL,DNQ-A-30,HBD-500STTJ,HD10PV.J03,HEV-P-Q-250,EEPJ,EEPL,MEV-J-H73,DNN-C-40,HEV-A-Q-150,HD10PV.J01,HBD-700SMM,HBD-25EP,HBD-25ET,MEV-J-H70,DFN-A-40,HEV-J-Q-500,DFN-A-35,DNN-H-250,DFN-A-30,HBD-100EPL,HBD-160EETL,HBD-50HTJ,HBD-50HTL,DNN-H-450,MEV-P-C20,HBD-180SML,HBD-180SMJ,HBD-160HPJ,DNQ-A,HEV-H-Q-80,HBD-160HPL,HD10V.J03,DNN-H-225,HD10V.J01,HEV-H-Q-500,MEV-P-C10,HD10D.J03,EETJ,EETL,HD10D.J01,HEV-H-Q-70,HBB-500LMT,HBD-125HPJ,HBD-125HPL,HBB-500LMP,HBB-250LMP,DNN-C-175,HBB-250LMT,MEV-P-E40,HEV-A-Q-500,DNN-H-200,HDP501,HDP502,HBD-700STTL,HBD-700STTJ,HBB-100LMP,HBB-100LMT,HD5XX,HBD-40HPJ,HEV-J-Q-700,HBD-40HPL,DKN-A,HEV-H-Q-90,HBD-450SMMJ,HEV-H-Q-40,HEV-H-Q-45,HBD-450SMML,HBD-40HTJ,MEV-P-E20,HD502B,HBD-160HTJ,HD502A,HEV-A-Q-80,HBD-160HTL,DFN-E-20,HEV-A-Q,HBD-125HTJ,HBD-125HTL,HEV-H-Q-35,MEV-J,HEV-H-Q-700,DNN-H-425,EEP,HBD-16EPL,DKN-A-7.5,HD501A,EET,HBD-16EP,HBD-16ET,HBD-16EPJ,DNQ-A-80,HBD-400LMP,HBD-710LMMP,DNN-P-500,HBD-710LMMT,MEV-P-E00,HEV-H-Q-60,HBD-100LET,HEV-H-Q-50,DNN-H-400,HBD-100LEP,DFN-A-7.5,HEV-A-Q-300,HBD-400LMT,HBD-40HTL,HEV-A-Q-70,HBD-450SMM,HBD-160HP,HBD-160HT,HBD-550LMT,HBD-700SMML,HBD-700SMMJ,DNN-C-350,HEV-J-Q-15,HEV-J-Q-10,DNN-X-200,DNN-C-100,HEV-A-Q-800,HEV-J-Q-25,HEV-J-Q-20,HBD-16ETJ,HBD-16ETL,HBD-32HP,HBD-200SML,HBD-90EET,HBD-200SMJ,HBB-315LMT,HBD-32HT,HEV-J-Q-35,HBD-90EEPJ,HBD-90EEPL,HEV-J-Q-30,HBD-90EEP,HBD-63EPJ,DNN-X-225,HBD-630LMMP,HRP70-20,DNN-P-300,HBD-630LMMT,MEV-P,HEV-P-Q-600,HDP5XX,HEV-J-Q-45,HBD-63EPL,HEV-J-Q-40,DNN-X-450,HBB-315LMP,HBB-50LMT,DNN-P-325,DNN-C-150,HBD-160EEP,HR70-50,HBD-160EET,DNN-X-400,HEV-J-Q-50,DFN-H-15,HBB-50LMP,DFN-H-10,HBD-63HT,HBD-50ET,HEV-A-Q-600,HBD-63HP,DNN-E-175,HBD-50EP,HBD-32HPJ,HBD-32HPL,HEV-J-Q-175,HEV-J-Q-60,HBD-63ET,HBD-63EP,HBB-180LEP,HR70-30,HBB-180LET,HEV-J-Q-70,HBD-63ETL,HBD-200HTL,HBD-63ETJ,HBD-32HTJ,HBD-32HTL,HEV-P-Q-800,DNN-P-100,DNN-X-425,DNN-C-125,HR70-40,HBD-400STTL,HBD-400STTJ,HEV-P-Q-M350,HEV-J-Q-80,EPJ,EPL,HBD-160EETJ,HBD-45EP,DNN-E-80,HBD-550STTL,HBD-550STTJ,DNN-P-80,HEV-J-Q-90,HBD-200STJ,DNN-P-125,DNN-C-500,HBD-200STL,HEV-P-Q-225,HBD-45ET,DNN-E-70,HR70-20,HBD-56EP,DNN-E-130,DNN-P-60,HEV-H-Q-1000,HEV-J-Q-125,HBD-450LMP,HBB-20LET,HBD-125HP,DNN-X-275,HEV-P-Q-450,HBD-450LMT,HBD-125HT,DNN-E-125,DFN-H-40,HBB-20LEP,HBD-100HTJ,DNN-P-350,HBD-56ET,HBD-100HTL,HR70,HEV-P-Q-M325,SMMJ,DFN-H-35,HEV-P-Q-200,HBD-63LET,HBD-63LEP,DFN-H-30,SMML,DNN-E-150,MEV-J-F00,MEV-J-F03,HEV-J-Q-150,DFN-H-25,ETJ,HBD-160EEPL,ETL,HBD-160EEPJ,DNN-P-130,DFN-H-20,HBD-630STTJ,DNN-P-35,DNN-E-40,HEV-P-Q-M300,HEV-P-Q-15,HBD-630STTL,HBD-280ST,HEV-P-Q-10,HBD-280SM,HRP70-40,DNN-C-300,HEV-P-Q-25,HEV-P-Q-20,HEV

2022/8/9 - 德尔电子 - 选型指南代理服务技术支持批量订货

解析过流保护器件之PPTC优势

关于电路的过流保护，方式多种多样，常用的有用可控硅为核心的电路保护、有用晶体管为核心的电路保护、有用继电器为核心的电路保护、有用一次性的保险丝、有用双金属片的温控电路、也有用专用集成电路保护器等等。本文中BORN伯恩半导体为大家介绍过流保护器件之PPTC的八大优点。

2024-09-06 - 技术探讨代理服务技术支持批量订货

【产品】额定电流15~60A，超小尺寸的盒式保险丝助力汽车电路保护

Littelfuse推出的MCASE+™系列产品是盒式保险丝，无槽类的MCASE+™产品额定电流最高40A,有槽的MCASE+™产品额定电流最高为60A，其更加小型化的封装可实现最佳空间利用。

2019-02-07 - 新产品代理服务技术支持批量订货

开关电源中，如何选用保险丝的电流？

一是看电路的最大持续工作电流，二是看工作环境温度，三是所选保险丝的认证情况，比如UL认证的保险丝折减率是75%。保险丝的额定电流=电路最大持续工作电流/（温度折减率*保险丝认证折减率），举个例子，电路的最大持续工作电流为2A，工作温度最大为80℃，对应保险丝的温度折减率为88%，UL认证，2A/（0.88*0.75）=3.03A，则所选保险丝的额定电流应大于3.03A。Littelfuse作为保护器件的大品牌，保险丝种类丰富，认证齐全，可以在平台搜索了解详情，有具体需要可以提选型帮助，保险丝不光只看电流的。

2019-12-12 - 技术问答代理服务技术支持批量订货

过流保护器件自恢复保险丝PPTC的优点是什么？

自恢复保险丝优点：自恢复保险丝常温零功率电阻可以作得很小，大电流产品只有几个毫欧姆，在路功耗较小，可以忽略不计、体积相对较小。自恢复保险丝可串联在易损电路内作过流保护、温度保险丝用，阻值突变速度快，在几个ms数量级，热容小，恢复时间短，耐冲击，可循环保护达8000次之多。自恢复保险丝可以作过温度保险丝用，因此在电路中在一定程度上体现出了温度保险丝性能和温度保险丝作用。达到在电路中实现过流保护和过温保护的双重保护功能。

2024-07-30 - 技术问答