It offers a 48 VDC redundant power input design and is secured with a double protection mechanism; power Polarity Reverse and an Overload Current Resettable Fuse.

它提供了一个48伏直流冗余电源输入设计，配备了双重保护机制：电源极性反转和过载电流自恢复保险丝。

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If a cell does get fully drained, though, it can go into a state known as polarity reversal, in which the surrounding good cells drive the bad one in reverse.

如果电池没有完全耗尽，便会进入一种称为极性颠倒的状态。这种状态下，周围具有电量的电池会反过来推动电量很少的电池工作。

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This is a sign that the many falls in vibration are now upon the reverse swing of polarity within the Great Central Sun.

这是大中枢太阳中诸多次振动下降后向极性之反向提升的征兆。

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Mountaineering Council of Scotland said incidents where compasses were affected by reverse polarity were increasing.

BBC: Reverse polarity a risk to climbers, mountain body warns

Ms Morning said a call from Mr Williams for experiences of reverse polarity had seen stories from outdoor enthusiasts come "flooding in".

BBC: Reverse polarity a risk to climbers, mountain body warns

No-one knows how the Sun's enormous magnetic fields are generated, or why they reverse polarity from positive to negative every 11 years.

BBC: Sun has strange 'spin cycle'