DIN EN 60947-5-3-2005 低压开关设备和控制设备.第5-3部分:控制电路器件和切换元件.在故障条件下具有规定功能的接近开关(PDF)的要求
Low-voltage switchgear and controlgear - Part 5-3: Control circuit devices and switching elements - Requirements for proximity devices with defined behaviour under fault conditions (PDF) (IEC 60947-5-3:1999 + A1:2005); German version EN 60947-5-3:1999 + A