DIN EN 60947-5-7-2004 低压开关设备和控制设备.第5-7部分:控制电路设备和开关元件.带模拟输出的邻近设备的要求
Low-voltage switchgear and controlgear - Part 5-7: Control circuit devices and switching elements - Requirements for proximity devices with analogue output (IEC 60947-5-7:2003); German version EN 60947-5-7:2003