DIN EN 60947-5-6:2000
低压开关设备和控制设备.第5-6部分:控制电路器件和切换元件、 接近传感器和切换放大器用直流连器件(NAMUR)
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