049402.5NRHF 力特快熔薄膜保险丝

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

型号：049402.5NRHF

电流：2.5A

电压：32V

494系列快熔型SMF功能与特色：

兼容无铅焊料且温度曲线更高。
小巧的尺寸适用于高度敏感的设备
平顶表面设计便于拾放操作
合金构造使该产品比陶瓷或玻璃管0603保险丝产品更有更高的浪涌耐受性（I2t）。

熔体额定电流不等于熔断器额定电流，熔体额定电流按被保护设备的负荷电流选择，熔断器

额定电流应大于熔体额定电流，与主电器配合确定。

熔断器主要由熔体、外壳和支座3部分组成，其中熔体是控制熔断特性的关键元件。熔体的

材料、尺寸和形状决定了熔断特性。熔体材料分为低熔点和高熔点两类。

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.