接触器还可方便地加装辅助触头组，和适当的热继电器组合，保护可能发生过负载的电路之用。

Contactor can be easily retro-fitting auxiliary contact group, and appropriate combination of thermal relay to protect the load that may have been circuits.

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表示为25a接触器的主触头为三对常开，辅助触头为一对常开，控制线圈的电压为直流110v，订货数量为20台。

Means need 25a contactor, main contact are three normally open, auxiliary contact is one normally open, control coil voltage is DC 110v, order volume is 20 sets.

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介绍了3TB40交流接触器辅助触头可靠性试验的方法和试验监测结果。

The paper introduces the method and monitoring result of reliability test research on auxiliary contact of 3TB40 AC contactor.

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