求翻译：电磁锁的开闭通常用带电显示器和传感器来实现的。它的作用是：一般都是为了防止误操作所装设的，电磁锁的工作电源一般为交流，当电磁锁带电时，可以用锁的把手，将其锁打开，在不带电的情况下，锁始终是闭锁的。是什么意思？

The opening and closing of the electromagnetic lock is usually charged displays and sensors to achieve. Its role is: are generally provided in order to prevent misuse of the power of electromagnetic locks work normally exchange When the the electromagnetic locks charged when, can be used to lock the

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Live video, and sensor for electromagnetic lock opening and are usually implemented. Its role is: generally is installed to prevent misoperation, electromagnetic lock work power exchange in General, when you charged electromagnetic lock, handle locks can be used, will lock open, without charging cas

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