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Calculate Size Of DOL and Star-Delta Starter Components
Calculate Size Of DOL and Star-Delta Starter Components

Easy way to calculate motor torque, fuse, CB, OL relay and contactor

For both DOL and Star-Delta Starter input fields are:

  1. System Voltage (V)
  2. Phase (1ph/3ph)
  3. Type of Motor (single phase, 3-phase induction, synchronous, wound rotor etc.)
  4. Motor Size (HP or kW)
  5. Motor Code (A, B, C… -H)
  6. Motor Efficiency (%)
  7. Motor RPM
  8. System P.F
  9. Application of Motor (motor load in household application, hermetic refrigerant comperssor motor etc.)

According to above inputs, following starters components are calculated:

Motor Torque / Current

  • Motor Rated Tourque (Full Load)
  • Motor Rated Tourque (Full Load)
  • Motor Starting Torque
  • Lock Rotor Current IL (Min)
  • Lock Rotor Current IL (Max)
  • Motor Starting Current
  • Motor Full Load Current (Line)
  • Motor Full Load Current (Phase)

Fuse (As per NEC 430-52)

  • Non-Time Delay Fuse (Max)
  • Time Delay Fuse (Max)

Circuit Breaker (As per NEC 430-52)

  • Instantaneous Trip Circuit Breaker (Max)
  • Inverse Time Circuit Breaker (Max)

Over Load Relay Setting

  • Relay Min (70% of FLC Phase)
  • Relay Max (120% of FLC Phase) or
  • Relay Setting (100% of FLC Line)

Contactor (for DOL starter)

  • Type of Contactor
  • Making / Breaking Capacity of Contactor:
  • Main Contactor (100% of FLC Line):

Contactor (for Star-Delta Starter)

  • Type of Contactor:
  • Making / Breaking Capacity of Contactor:
  • Main Contactor (58% of FLC Line):
  • Delta Contactor (58% of FLC Line):
  • Star Contactor (33% of FLC Line):

Transient Time Delay Setting (for Star-Delta Starter)

Software:Calculate Size Of DOL and Star-Delta Starter Components
Version:10.6.13
Developer:Jignesh Parmar
Size:274 KB
Price:Free
Download:Right here | Get Download Updates | Get Technical articles
Calculate Size Of DOL and Star-Delta Starter Components (Contactor Configuration Sheet)
Calculate Size Of DOL and Star-Delta Starter Components (Contactor Configuration Sheet)

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Page edited by E.C. (Google).

17 Comments


  1. alwyn
    Nov 14, 2015

    Hi,
    Very useful tool………… thanks a lot…………


  2. Viral Zala
    Oct 04, 2015

    Really Very useful tool. Thanks a lot.


  3. daxesh
    Jun 26, 2015

    how to download this excel formet


  4. vikas singh
    Jun 05, 2015

    how we check the rating and size of cable use in system


  5. Roshan Mishra
    Mar 31, 2015

    thx buddy….awesom work hav done.


  6. sunil
    Aug 26, 2014

    I have more information


  7. M.lotfi
    Aug 26, 2014

    it’s better that this calculator do with MATLAB software(GUI)/


  8. M.lotfi
    Aug 26, 2014

    Tnks very much!! that is simply and very usfull!


  9. Glenn George
    Jun 27, 2014

    Please add me to this group.


  10. Mohammed
    May 05, 2014

    Jignesh Parmar——— thank you ——- go ahead


  11. Mubarak kahouli
    Apr 08, 2014

    Thanks. I need to download the software


  12. Mubarak kahouli
    Apr 08, 2014

    Hi
    Tanks a lot.I need your help to download the software, because I cant do it.


  13. Naseem
    Mar 04, 2014

    Thank You so much it is very helpful


  14. eepower
    Oct 05, 2013

    thank you very much


  15. eng.ibrahim
    Oct 05, 2013

    that’s very good


  16. nileking99
    Aug 24, 2013

    5hanks a lot for the useful tool.


  17. MAHENDRAN R.
    Jul 28, 2013

    Very useful tool for every electrical engineer… special thanks to ” Jignesh Parmar”

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