Low-voltage switchgear and controlgear - Part 5-9: Control circuit devices and switching elements - Flow rate switches (IEC 60947-5-9:2006); German version EN 60947-5-9:2007
低压开关设备和控制设备.第5-9部分:控制电路设备和开关元件.流量开关(IEC 60947-5-9-2006);德文版EN 60947-5-9:2007