Motor starters

Welcome Abdul,

That is actually hard to answer, as it is a large topic and what you may need very much depends what level of knowledge you already have, and for what you will be designing.

If you mean designing systems in the sense of specifying what is needed in terms of buying in ready made motors and ready made starters modules assembled by someone else, which is the usual case, or if you are interested in building up your own  by assembling timers contactors etc into a suitable enclosure,  and/or developing your own controls and interlocks.  In which case there are a lot of approvals to be met and testing type work, in addition to the actual design itself. ( I presume you are not intending to design at the level of developing contact ors and so on yourself from solenoids and moving contacts, that is normally reserved for extremes of voltage or current where off the shelf parts do not exist.)


Assuming that it is the specification of  sub-systems level (and please accept my apologies if it isn't), how happy are you with designs involving  3 phase power electrics, and reconciling breaker ratings to KVA and so on for non motor loads, and what sort of motors are you expecting to encounter? Quite often the motor maker's literature is a good starting point for the setting of overload trips, maximum no. of starts per hour and so on . It must be mentioned in passing that in many situations the star-delta starter is giving way to the variable frequency drive, and  you will need to be familiar with that too.


You could do worse than take a look at this Cahier Techniques Chapter on LV motors and see how much of it you already know (or not).

The photos are of course of Schneider equipment, as they wrote it,  but the detail is graded, and the explanations are complete so that is quite comprehensive. 

I'm sorry this is vague, but once we  know better what you do and do not know, and what specific problem you are solving,  it may be easier to answer a more focussed question.

regards Mike