PolySwitch PPTC在短路、过流、过温等故障状态下，PPTC 器件在大电流和高温升双重作用下，能够更快速的动作从低阻态突变为高阻态，及时限制红外管或紫外管的电流达到保护目的。并一直保持这种保护状态，只有在断电后PolySwitch PPTC器件才会由高阻状态恢复为低阻状态。
不断电PolySwitch PPTC是不会恢复的，这可有效避免带电恢复、使控制电路板可能出现的和潜在的各种问题和安全隐患。(推荐阅读：
JDTFUSE在LCD驱动板的保护应用
)
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