由两个独立线圈(开和关)进行控制。即使继电器失去电源,这些接点仍能保持其位置。继电器能够识别所有闭锁输出接点卡,并组装相应的设置菜单。有电源时,在执行继电器其他功能前,继电器首先从硬件读出闭锁接点的位置(如保护和控制功能块或灵活逻辑)。
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