Littelfuse超小型延时保险丝0443003.DR

Littelfuse 443 系列 - NANO2®延时超小型表面贴装保险丝

型号：0443003.DR

电流：3A

电压：250V

250 NANO2保险丝符合RoHS指令，与无铅合金焊料完全兼容，且具有与无铅组件相关的更高温度曲线。

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.