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.
最后利用建立的热分析模型分析了主回路发热对接触器温升的影响。
Based on the model, the influence of the main circuit on the temperature rise of ac contactor was researched.
即主传动系统由SCR-D取代原K-F-D系统，电控部分用可编程序控制器PLC取代原继电器-接触器控制方式。
The original K - F - D system was replaced by SCR - D system for main transmission, while PLC was substituted for the original relay contactor control mede.
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