The three-pole switch was originally used to switch a voltmeter guard along with the signal lines.

三刀开关最早用于切换伏特计保护及信号线路。

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This article analyzes the selection forms of protection earthed system of low Pressure switch of civil buildings, and studied construction request of guard Wire (PE) earthed system.

分析民用建筑低压配电保护接地系统的选用型式，浅论了系统的保护线(PE)接地装置施工要求。

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The switch is protected through the linked action of the guard plate to realize the power cut and the brake.

通过保护板的动作联动保护开关，实现断电与刹车。

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In order to guard against the generics, Forest is trying to switch patients from Celexa to Lexapro, which still has years of patent protection.

FORBES: Magazine Article