Indian Standard : specification for low-voltage switchgear and controlgear - part 4 contactors and motor-starters  section 1 electromechanical control circuit devices 

 - New Delhi  Bureau of Indian Standards  1993 
 - 94p.  
<br/><br/> IS 13947 (part 4/sec 1) : 1993 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Indian Standard<br/>Rotating electrical machines