AS-B872-100 有载调压
可控硅击穿或，此类故障不分品牌，因厂家而易，但都比接触器的故障率低，而且主要问题出现在饼式可控硅的安装工艺上。
3.控制器烧坏
相对于软启动器来讲，控制器烧毁故障是严重的。有的厂家此类故障造成的返修率已超过30%。进口的或合资的厂家此类问题不多见。主要是控制器的电源和触发电路以及输入电路三部分容易烧毁。
4、软启动器误动作
电动机在运行的装态下因软起动器受干扰而停机在停止状态下因软起动器受干扰而起动是时有发生，前者较普遍，后者只有两个品牌发生过。究其原因，一是产品质量问题，二是和线路布局有关。但是凡是进口或合资的软启都没有上述现象，产品牌中此问题比较多。
5、软启动器内部插接件接触不良
软启动器内部插接件选用本来不是问题，这是内厂家容易忽略的问题，经常出现故障。进口或合资厂家都不犯此类的错误。
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