由兩個獨立線圈(開和關)進行控制。即使繼電器失去電源，這些接點仍能保持其位置。繼電器能夠識別所有閉鎖輸出接點卡，并組裝相應的設置菜單。有電源時，在執(zhí)行繼電器其他功能前，繼電器首先從硬件讀出閉鎖接點的位置(如保護和控制功能塊或靈活邏輯)。

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