Low-voltage switchgear and controlgear - Part 5-6: Control circuit devices and switching elements, DC interface for proximity sensors and switching amplifiers (NAMUR) (IEC 60947-5-6:1999); German version EN 60947-5-6:2000
低压开关设备和控制设备.第5-6部分:接近传感器和开关放大器(NAMUR)的控制电路装置和开关元件 直流接口(IEC 60947-5-6-1999);德文版EN 60947-5-6:2000