正確選用控制元件的品種、規(guī)格是提高元件使用可靠性的關(guān)鍵。為此必須深入確切地了解和分析機床對電氣控制系統(tǒng)的要求和系統(tǒng)對控制元件的要求。并且收集和消化控制元件制造廠提供的技術(shù)材料，如果這些資料不能滿足選用的要求時，機床制造廠可按實際使用的條件對控制元件進行試驗以確定是否合用。由于選用不當影響可靠性的例子有：忽視輸入或輸出的機械參數(shù)，例如選電磁鐵時未考慮所拖負載的力――行程特性，選限位開關(guān)時未考慮撞塊速度；選接觸器時未考慮點動、反接制動的工作方式；選繼電器時未考慮能做到可靠接觸的額定工作電壓和額定小工作電流；選短路保護電器（包括熔斷器）時未考慮對接觸器等觸頭的保護；選控制變壓器時未考慮漏阻抗在電磁系統(tǒng)起動電流情況下的壓降等。
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