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。
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。
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。
If the differential expansion is beyond the guard - line and no effective measures are taken to control the differential expansion, the only way is to switch off and stop the turbine.
当胀差超过警戒值时，如没有控制汽轮机胀差的有效措施，只能打闸停机。
If the differential expansion is beyond the guard - line and no effective measures are taken to control the differential expansion, the only way is to switch off and stop the turbine.
当胀差超过警戒值时，如没有控制汽轮机胀差的有效措施，只能打闸停机。
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