低压或高压开关- - -用于当水压降低到预先设置的最低值或超过预先设置的最高值时，切断控制电流。
Low or high pressure switch - turns off control circuit when water pressure drops below a set minimum, or above a set maximum.
低压供用电系统中为了减少发生人身电击事故和接地故障切断电源时引起的停电，必须加装剩余电流动作保护装置。
In order to reduce the power cut off which caused by electric shock accident and earth-fault power cut off, it must install residual current operated protective device.
低压熔断器；低压开关器及控制器-开关切断器及熔断器组合单位；
Switches , disconnectors , switch - disconnectors and fuse - combination units ; low voltage switchgear and controlgear assemblies.
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