DIN EN 60947-5-3-2014 低压开关装置和控制器.第5-3部分:控制电路设备和开关元件.故障状态下确定运行状况的设备接近性用要求.(PDDB) (IEC 60947-5-3-2013).德文版本EN 60947-5-3-2013
Low-voltage switchgear and controlgear - Part 5-3: Control circuit devices and switching elements - Requirements for proximity devices with defined behaviour under fault conditions (PDDB) (IEC 60947-5-3:2013); German version EN 60947-5-3:2013