International Electrotechnical Commission <br/><br/>
IEC 60947-4-2:2020 ; Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – Semiconductor motor controllers, starters and soft-starters 

 - Ed.4.0 
 - Geneva  IEC  2020 
 - 230p. 
 - 0