在各种保护电路中，元件最少、成本最低、可靠性最高的保护电路，莫过于
PPTC
自恢复保险丝元件以及PPTC与压敏电阻或TVS配合的电路。
一般情况下，一个
jdtfuse
过载保护元件或与一个压敏电阻配合即可，当有高压浪涌时，压敏电阻导通，大电流通过
jdtfuse
，并使
jdtfuse
的电阻值迅速变大至限流保护，从而保护整个系统电路，当断电或故障消失后
jdtfuse
恢复，变为低电阻的正常工作状态。（推荐阅读：
什么是保险丝盒
）
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