要解决好这个问题，只选用ESD器件是不够的，我们通过长期实验发现，选用jdtfuse与ESD器件配合应用效果最好，jdtfuse
是
自恢复保险丝.
在电源线和RS485线上的
TVS
前面各串联一个
jdtfuse
即可，这样雷电流通过
jdtfuse
和TVS放电，其放电电流使
jdtfuse
电阻值变大，瞬间限制了电流，保护了TVS和整个系统，正常时
jdtfuse
变为低电阻，不影响系统的工作。
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