如何选用正温度系数热敏电阻 如何为温度传感器选择正确的热敏电阻？
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正温度系数热敏电阻PTC分为高分子材料的PPTC和陶瓷材料的CPTC。大家统称为自恢复保险丝。
PPTC过流保护元件有多种规格型号封装形式，在电路中与负载串联使用，安装无极性、不分交直流。一般根据最 大环境温度及工作电流、电压选用“保持电流”大于工作电流的产品型号；最大工作电压小于或等于“耐压”指标的产品型号。
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