Star delta starter control diagram:

This diagram shows how to make a star delta starter control diagram. In this circuit, we use TP MCB ( Tripple Pole Miniature Circuit Breaker ), 3 magnetic contactors, and 3 phase motor. This circuit is very simple and easy to make. If you want to know more details about this circuit please check our youtube video below the post and stay with us for more updates.


Diagram of Star delta starter control:

Star delta starter control diagram

Components needed For this Project:

You can get the components from any of the sites below:

  1. TP MCB 32A [See Buy Click Amazon]
  2. Magnetic Contactor 40A [See Buy Click Amazon]
  3. 3 Phase Motor (5 HP) [See Buy Click Amazon]
  4. Motor Protector Overload [See Buy Click Amazon]

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

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Components used to make the Star Delta starter control diagram:

01. TP MCB:

The full meaning of MCB is Miniature Circuit Breaker for TP MCB. MCB is an electromagnetic switch or device. If for any reason a short circuit occurs in the supply line or load line (line to line or line to neutral) or in case of overload MCB. the MCB automatically trips and disconnects the main line circuit or household power supply Connection. TP MCB In 3 Pole MCB, Switching & Protection is affected in only 3-Phases and the Neutral is not part of the MCB. 3 pole MCB signifies the Connection of Three Wires for a 3-Phase system Red-Yellow-Blue Phase. 3-Phase Supply Only Without Neutral.

02. Magnetic Contactor:

A magnetic contactor is an electromagnetic switching device. It is generally used for controlling 3-phase Motors. The operation of a magnetic contactor is similar to that of a Relay. but a relay is used for low-power or low-voltage connections, and a magnetic contactor is used for high-power or high-voltage connections. As soon as the supply is applied to the magnetic contactor coil. its normally open contacts are closed and normally closed contacts are opened and the associated devices are also operated. This is how a magnetic contactor works.

03. 3 Phase Motor:

A Single-Phase Motor is an Electrically-Powered Rotary Machine That Can Turn Electric Energy into Mechanical Energy. It Works by Using a Single-Phase Power Supply. Single-phase Motors Are Used in Equipment And Machines That Are Smaller in Size And Require Lower Horsepower. This Includes Equipment Such As Refrigerators, Pumps, Compressors, Fans, and Portable Drills. Single-phase motors Have a Similar Construction to The 3-phase Motor, Including an AC Winding That is Placed on The Stator And Short-Circuited Conductors That are Placed in a Cylindrical Rotor.

04. Overload Relay:

Overload Protection is Protection Against a Running Overcurrent That Would Cause Overheating of The Protected Equipment. Hence, An Overload is Also a Type of Overcurrent flow. Overload Protection Typically Operates on an Inverse Time curve where the Tripping Time Becomes less as the Current Increases. This Overload Protector is an Essential Component for Many Sockets Power Systems. The Top-Quality Overload Protector can Effectively Protect Electrical Products from Power Surges.

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Frequently asked questions

What is the control system of star-delta?

In operation, the Main Contactor (KM3) or the Star Contactor (KM1) is closed initially, and then after a period of time, the star contactor is opened, and then the delta contactor (KM2) is closed. The control of the contactors is the timer (K1T) built into the starter.

How does a star-delta starter work?

Star delta starters contain a triple pole double throw switch, that is what changes the stator windings from star to delta. They also have three contactors, the main, star, and delta contactors, which control the winding currents diagram.

What is the star-delta starter factor?

During starting the stator winding is star-connected, so that the voltage over each phase in the motor will be reduced by a factor of 1/v3 of that should be for delta-connected winding. Hence a star-delta starter is equivalent to an auto-transformer of ratio 1/v3 or 57.73 % reduced voltage.

What is the result of a star-delta starter?

It has to overcome a massive amount of torque and current flow, which not only puts a strain on the motor but also on your electrical system. With a star-delta starter, the starting current flow and torque are significantly reduced, easing the burden on both the motor and your electricity bill.

Which relay is used in the star-delta starter?

Star-Delta Type 1 coordination, The thermal overload relay is placed in the Delta circuit diagram. For Type 2 coordination the thermal overload relay selection is based on the Full load current flow rating and the selection for type 1 coordination is based on Full load current / Sqrt 3 (FLC/1.732).

Read more Single Phase Wiring


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