3 phase Motor Star Connection diagram:

This diagram shows how to make 3 phase motor star connection. In this circuit diagram, we use a three-phase motor, a magnetic contactor, a start button, and a stop button. First, we need to connect the magnetic contactor like our circuit diagram with the motor and start-stop switch. Then this circuit is ready for use. If you want to know more about this circuit diagram, please check our youtube video for more information.


Digram of 3 phase Motor Star Connection:

3 phase Motor Star Connection diagram

Components needed For this Project:

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

  1. 3 phase water pump (3 HP) [See Buy Click Amazon]
  2. Magnetic Contactor 40A [See Buy Click Amazon]
  3. Push Button NC Switch [See Buy Click Amazon]
  4. Push Button NO Switch [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 3 phase Motor Star Connection diagram:

01. 3 Phase Motor:

A 3-phase electric motor uses a 3-phase Power Supply to Convert Electric Energy into Mechanical Energy. It contains four Wires (Three hot Wires and one Neutral Wire) and Uses 3 Alternating Currents of the Same Frequency. Since it Generates a Rotating Magnetic Field, it does not need a Capacitor for the Startup. Some 3-phase Motors are Reversible, Which Means they can serve as Generators by Turning Mechanical Energy into Electrical Energy.

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. Stop Switch:

An NC (Normally Closed) Push Button is a Push Button That, In Its Default State, Makes Electrical Contact With The Circuit. An NC (Normally Closed) Push Button is a Push Button that, in its Default State, Makes electrical Contact With the Circuit. When The Button Is Pressed Down, The Switch no Longer Makes Electrical Contact And The Circuit is Now Open. When The Button is Not Pressed, Electricity Can Flow, But When it is Pressed The Circuit is Broken. This type Of Switch is Also known As a Normally Closed (NC) Switch.

04. Start Switch:

NO (Normally Open) Terms Refer to a Type of Dry Contact or Wet Contact. A Push to Make Switch Allows Electricity to flow Between its 2 contacts when held in. When the button is released, the Circuit is broken. This type of Switch is also known as A Normally Open (NO) Switching system. As its name implies, a Normally Open (NO) Switch Contact or “a Contact” is a Switch. Put very simply, a Normally Open Sensor will have no Current When in a Normal State But When it Enters an Alarm State it will have +5V applied to the Circuit.

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Frequently asked questions

What is the voltage of a 3-phase motor star connection?

In star wiring, the three winding phases of the motor were combined to form the so-called star point. With the supply voltage of 400V, the phase voltage (voltage between the line conductors) was about 230V each. In delta wiring, the ends of the three winding phases are combined and connected to the individual phases.

What is the star connection on a 3-phase motor?

In a star connection, the same ends of the three coils were connected to create a neutral point. Star connection was used only when we require less power supply and it would only give a low power supply when compared to the delta connection because the 3 terminals were shorted and it would become neutral.

How do you calculate 3-phase motor voltage?

The formula is volts times the square root of 3, which happens to be rounded off to 1.732. For 2 lines each carrying 120 volts, the calculation for this is 120 volts times 1.732, and the result is rounded up to 208 volts. That's why we call it a 208-volt three-phase circuit, or a 208-volt 3 phase line.

What is the formula for a 3-phase motor load?

For calculating full load current in a 3-phase system we have to use the formula W =root 3 ×VL ×IL ×cos teeta (power factor )now IL =W /1. 732 ×VL ×P.f . Here in this formula W = power supply root 3 =1.732, VL =Line voltage, IL =Line current, and cos teeta= power supply factor.

What is star connection in 3-phase derivation?

The STAR connection Consider the following three-phase system with three separate single-phase circuits. In this system, we need six conductors to supply power from the source to load. We could combine the return path of the three circuits and thus reduce the number of conductors to four.

Read more Single Phase Wiring


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