【选型】如何选择一款合适的保险丝？

时间： 2019-10-22 来源：电安科技

技术问答

目前市场上的保险丝厂牌众多，参数复杂，怎么样才能选到合适的产品？电安小编跟大家分享下相关保险丝产品的选型经验。

1. 了解电路的最大工作电压，最大持续工作电流，了解最大短路电流看是否需要高分断能力的保险丝，了解目前脉冲I2t的最大电流和波形。目前客户保险丝温度范围（需要考虑到保险丝自身的发热）目前客户能接受的封装。

2. 通常容性负载选择慢断保险丝，感性负载选用快断保险丝。

3. 根据最大工作电压和最大持续工作电流可以大致确认使用什么类型和封装的保险丝，

如：220V，最大持续工作电流1A，可以考虑选用陶瓷管的5X20保险丝（如CA422），或者方形贴片2410的保险丝，这个要看行业主流，如家电控制板就用陶瓷管的为主，LED吸顶灯用2410的为主。虽然陶瓷管6X32的也有产品可以提供，但是价格体积和5X20对比没有任何优势。

又如：32V ，最大持续工作电流1A，可以用陶瓷贴片保险丝（如CC202）

常见的电安保险丝电流范围如下

4. 确定具体工作电流。

步骤1：根据图1以下温度曲线来折减出电流

图1

以32V ，最大持续工作电流1A为例，假设保险丝温度范围为-40到+80度，那么因为我们选了慢断类型的。折减率为0.78，还要算上UL保险丝的折减率0.75，那么：

1A/0.78=1.28A 1.28A/0.75=1.71A

所以只要保险丝大于1.71A就可以满足稳态需求。

步骤2：根据研发提供的脉冲波形算出满足I2t的保险丝

例如根据测试的波形算出I2t，不同的波形计算公式见图2：

图2

例如现在算出来的是0.5A2S

由于满足多次脉冲的冲击会降保险丝寿命，假设我们认为应该满足10万次寿命，参考图3可以知道日常冲击不能超过保险丝的I2t的22%，那么理论上我们选取保险丝的的I2S应该大于0.5 A2S/0.22=2.27A2S

图3

参考图4的CC202的选型列表

图4

可以看出满足电流大于1.71，i2t大于2.27的最合适的是CC202A004

世强生态合作伙伴电安科技专业从事保险丝等保护器件的研发和生产，产品广泛应用于电动汽车、汽车电子、LED照明、无人机、智能手机、电脑、太阳能和云计算的领域。搜索电安科技获取更多的资讯。

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选型指南 - 电安科技 PDF 中文下载