# Calculate Size Of DOL and Star-Delta Starter Components

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## 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)

• 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):

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1. gendhul
Nov 28, 2017

very help full

thanks

2. ashok rao
May 23, 2017

3. j
Nov 21, 2016

This is great !

4. Hayetom
Oct 15, 2016

Help full thank you !

Sep 29, 2016

Thank You so much it is very helpful

6. alwyn
Nov 14, 2015

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

7. Viral Zala
Oct 04, 2015

Really Very useful tool. Thanks a lot.

8. daxesh
Jun 26, 2015

9. vikas singh
Jun 05, 2015

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

10. Roshan Mishra
Mar 31, 2015

thx buddy….awesom work hav done.

11. sunil
Aug 26, 2014

12. M.lotfi
Aug 26, 2014

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

13. M.lotfi
Aug 26, 2014

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

14. Glenn George
Jun 27, 2014

15. Mohammed
May 05, 2014

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

16. Mubarak kahouli
Apr 08, 2014

17. Mubarak kahouli
Apr 08, 2014

Hi

18. Naseem
Mar 04, 2014

Thank You so much it is very helpful

19. eepower
Oct 05, 2013

thank you very much

20. eng.ibrahim
Oct 05, 2013

that’s very good

21. nileking99
Aug 24, 2013

5hanks a lot for the useful tool.

22. MAHENDRAN R.
Jul 28, 2013

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