现货 力特薄膜贴片式保险丝 0494004.NRHF

Littelfuse 494 系列 - SlimLine无铅0603快熔薄膜保险丝

型号：0494004.NRHF

电流：4A

电压：32V

494系列快熔型SMF保险丝应用：

为下列空间受限的应用提供次级保护：
手机
电池组
数码相机
DVD播放机
硬盘驱动器

安秒特性：

每一熔体都有一最小熔化电流。相应于不同的温度，最小熔化电流也不同。虽然该电流受外界环境的

影响，但在实际应用中可以不加考虑。一般定义熔体的最小熔断电流与熔体的额定电流之比为最小熔

化系数，常用熔体的熔化系数大于1.25，也就是说额定电流为10A的熔体在电流12.5A以下时不会熔断。

保险丝(fuse)也被称为电流保险丝，IEC127标准将它定义为"熔断体（fuse-link)"。其主要是起过载保护

作用。电路中正确安置保险丝，保险丝就会在电流异常升高到一定的高度和热度的时候，自身熔断切断

电流，保护了电路安全运行。 

Fuse is also known as current fuse, and IEC127 standard defines it as "fuse-link". It mainly plays 

the role of overload protection. When the fuse is properly placed in the circuit, the fuse will cut 

off the current when the current is raised to a certain height and heat, and the safety of the 

circuit will be protected. More than 100 years ago, the fuse invented by Edison was used to 

protect the expensive incandescent lamps. With the development of the times, the fuse protected 

the power equipment from the damage caused by the overheating of the electric current, and 

avoided the serious damage caused by the internal failure of the electronic equipment.