Automatic Star Delta Starter using Relays and Adjustable Electronic Timer for Induction Motor

Model: 13

Solderable DIY project kit for Engineering & Diploma students Worldwide

Do-It-Yourself Kit :

Includes complete hardware comprising of discrete components, modules, PCB, controller etc. and tested program code for building the project. Extensive documentation for project execution including step-by-step instructions for Circuit building, Assembly procedure and Troubleshooting. (Tool kit-Multimeter, Soldering iron and program burner not included in the kit)

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The project is designed to provide low voltage start to induction motors. This is achieved by using star to delta conversion. Star/Delta starters are probably the most common reduced voltage starters in the 50Hz industrial motor world. Star delta is used in an attempt to reduce the start current applied to the motor. Thereafter, full load current is applied to the motor.

The Star/Delta starter is generally manufactured from three contactors; and electromechanical timer and a thermal overload for operating a 3 phase motor at 440 volt at ac mains supply 50 Hz. The interlocking arrangement of all the contactor coils is traditionally wired in 440 volt AC.

This project uses a system to start a 3 phase motor at 440 volt AC mains supply 50 Hz with a set of 12 volt DC relays in star mode first and then to delta mode by an electronically adjustable timer. A set of relays are used to shift the motor connections from star to delta with a time delay.

The project is supplied with six lamps instead of a 3 phase motor i.e., two lamps representing each phase winding of the motor. The interlocking arrangement of the relay coils and the electronic timer are all wired in low voltage DC of 12 volt fed from an inbuilt DC power supply for safe handling of the starter during the study. It still retains its application for a 3 phase motor starting with single phasing prevention also.

During star operation the lamps would glow dim indicating the supply voltage across the coils are 440/root of (3). In delta condition after the timer operates the lamps would glow with full intensity indicating full supply voltage of 440volts. The timer comprises of a 555 in mono-stable mode the output of which is fed to a relay for changing the mains supply from 3 phase star to delta.

The project also has the provision of single phasing protection since 3 phase motors get burnt if any one phase goes missing during running. The output to the lamps shall be completely cut-off in the event of any phase failure.

Further the project can be enhanced by using a thyristors in firing angle control principle for soft start of the induction motor that would overcome all the drawbacks of star delta starter.


Easy to use, Self-explanatory kit.

All-inclusive solution kit.

Extensive audio-visuals available.

Branding-free material.

Low Cost Relay Star-Delta Starter..

Call/mail for Tech Support from 10 am – 7 pm.

Can be Customized for Arduino, Raspberry Pi, PIC

Non Microcontroller Project.


Hardware Requirements

  • 3CO Relay
  • 1CO Relay
  • 555 Timer
  • LEDs
  • Resistors
  • Capacitors
  • Transistor
  • Diodes
  • Transformers

Software Requirements

  • None

Q & A

Buyer Feedback

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  1. Rated 5 out of 5

    Mansi Machhi

    My senior suggest edgefx website. So, i have directly visited the website. My senior suggested me to buy project from edgefx. I like most about edgefx was the Audio-Visuals. i received the kit on time with right components. the support team has helped me in purchasing the project. According to me everything was good. i would like to give reference to my friends and juniors.

  2. Rated 5 out of 5



  3. Rated 5 out of 5


    I received the kit on time.I am really satisfied while I am building the project. I didn’t approach your technical support.My experience in building the project was very nice; study material which you provided is very good.I will surely recommend to others because I like the preprogrammed microcontroller and study material.I will refer my friends.

  4. Rated 4 out of 5

    Saurav Ganguly

    My friends referred Edgefx.My seniors suggested to buy the kit from Edgefx, Quality of components is good.I got the kit on time.Edgefx Team was so good in the support.

  5. Rated 4 out of 5

    Aditya Mishra

    I had taken the mini project from Edgefx that is the reason I had taken the Major project.I like the most about the project kit is Audio-Visuals.