It is provided with L and N double-breakswitch and power indicator lamp.
零、火线双断开关设计，配有电源指示灯。
2
Introduces the load-breakswitch monitor system of OCS in Liupanshui railway conjunction, offers methods and precautions for its installation and commissioning.
介绍了内昆线六盘水枢纽接触网负荷开关监控系统，并结合该系统给出了其安装调试的方法及注意要点。
3
But viruses know their hosts well-they can break into cells undetected, switch off alarm systems, and undermine the cell's authority in deciding which genes get expressed.