VT3□□系列直流（DC）型電磁閥配線時，有極性嗎？

電磁閥的電源線為紅色與黑色時，紅色接正（+）、黑色接負（-）。DIN型端子以及插座型端子等沒有電源線的情況下，1號端子接正（+）、2號端子接負（-）。除此之外，不分極性。

SMC電磁閥通過控制器切換脈沖的電極觸點來改變電磁閥的開關狀態，當控制器發出電脈沖時，驅動閥芯克服永磁力產生上下移，閥瓣到位后在永磁作用下處于自保持狀態，同時用屏蔽技術，防止外界干擾。

日本SMC電磁閥線圈通電。此時，電磁閥鐵芯在電磁力的作用下克服回復彈簧作用力移到單管端，關閉單管端出口，雙管端出口處于開啟狀態，制冷劑從電磁閥雙管端出口管流向冷凍室蒸發器流回壓縮機，實現制冷循環。

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