DIN EN 60947-4-1-2011 低压开关设备和控制设备.第4-1部分:接触器和电机启动器.机电式接触器和电机启动器(IEC 60947-4-1-2009);德文版本EN 60947-4-1-2010
Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters (IEC 60947-4-1:2009); German version EN 60947-4-1:2010