Star Delta Circuit Diagram

The most active post in Electrical Engineering Centre blog is Star delta starter and Star Delta motor connection.I received many comments and request for Star Delta circuit diagram.

So this time i want share my simple star delta circuit diagram completed with power and control line circuit.I hope it can be as basic reference for all electrician about star delta starter diagram.

Star delta starter is a common used in domestic and industry sector to drive variant application such as chiller water pump,machinery,air-compressor and many more equipment.

Why star delta become common starter of motor control?

It is because this starter have a simple circuit diagram,low cost application and can drive for high horse power motor with low friction and can reduce starting torque with acceptable condition.

But this starter also tricky for beginner electrician and who not familiar with 6 wire electric motor.Actually it not too difficult if we have fully understanding the principle of star delta motor,starter sequence,circuit diagram and their operation.

For more detail please read my last post about star delta starter,star delta motor connection and many more topics about star delta in motor control categories.

If have any question or suggestion,please drop down your comment and we can share others circuit diagram of my circuit diagram not too clear but i attached together with another circuit diagram for reference.


Example for star delta circuit diagram


For more detail star delta circuit diagram,please download PDF files with click the link below :-


* NOTE : This is one of circuit diagram design for star delta.It have variant design of star delta diagram depend on designer style for motor control.The important thing is it can operated with correct sequence and operation to avoid motor from serious damage or burn out.


  1. preop says:


    Plz if possible Differant type starter and it’s fundamental with wiring diagram require.

  2. Joseph says:

    Thanks for the info it helps a lot..

  3. Kalyowa Samuel says:

    the circuit diagram is not clear and its labeling.

  4. Electrician in new York landscape lighting Nyc says:

    Although electricity is used in every aspect of our lives, it is very dangerous for you to mess with if you haven’t been formally trained and educated. Whenever you have electrical problems, hire an electrician right away are the best in this field.

  5. Jagdish D Shrirao says:

    please give description about how to work star delta from control wiring diagram

  6. james bako says:

    Hi, this is worth reading, but

    1) The control and power circuit diagrams are not clear to be read.
    2) I am sorry, the motor would not run when it is switched on to delta.

    • Hi James..thanks for the input…
      i already upload another example for star delta starter diagram.It more clear and simple.

  7. Nasir khan says:

    Hello Dear

    plz send me some pdf books of Electrician and circuit diagrams of Star Delta by my email address because I havn’t Internet facility in this company so just I will download it from email in Net cafe. “” thanks for your attention

  8. farzad says:

    if we use a 45kw motor as a hydraulic pump, is that necessary to operate it on star-delta or is that possible to operate straight on delta?( 400delta/690star & 3phase 380 power lines )
    pay attention there is no load at first moments of operation before switching magnetic valves.
    thanks a lot

  9. Asim shah says:


  10. younish says:

    i wan to all kind of stater circuit diagram than.

  11. 45kw motor wirning

  12. thankyou

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  14. ALPESH GOHIL says:


  15. martin kirimboyi says:

    Will you able to share complete star delta

  16. K M Sridhara says:

    i want automatic restart circuit for star delta starter

  17. This site definitely has all of the info
    I wanted concerning this subject and didn’t know who to ask.
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