3 phase star 3 motor connection:

This diagram shows how to make 3 phase star 3 motor connection. In this circuit diagram, we use a TP MCB ( Tripple Pole Miniature Circuit Breaker ), a DP MCB ( Double Pole Miniature Circuit Breaker ), an NC switch( Normal Close ), 3 NO ( Normal Open ) Switches, 3 Magnetic Contactors with overload, and 3 Three-Phase Motor, etc. This diagram is very simple and easy to make. If you want to more about this circuit please check our youtube video in the below article.


Diagram of 3 phase star 3 motor connection:

3 phase star 3 motor connection

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. Push Button NO Switch [See Buy Click Amazon]
  5. Push Button NC Switch [See Buy Click Amazon]
  6. DP MCB 10A [See Buy Click Amazon]
  7. 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 3 phase star 3 motor connection:

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:

The Meter Which is used for Measuring the Power of the 3-phase supply is known as the 3-phase energy meter. A 3-phase Energy meter is a 3-phase 4-wire direct Connected meter that is Used to estimate the electricity on the Three-phase power supply, mostly for residential & commercial use. A 3-phase meter helps consumers & utilities in revenue protection. The 3-phase meter is Constructed by Connecting the 2 single-phase meters through the shaft.

04. NO 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.

05. NC 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.

06. DP MCB:

DP MCB In 2 Pole MCB, switching & protection is affected in phases and the neutral. A Double Pole or DP Switch is a Switch that Controls 2 Circuits at the same time. In terms of Residential Switching, this Normally means it Switches the live and Neutral at the same time. In Layperson Terms, Double Pole switches or DP Switches are Exclusively Designed to Control 2 Different Electrical Circuits at the same time, which allows the Appliances to Isolate safely and reliably. Fan or light Combinations and Medical Equipment are some of the many applications for DP Electrical Switches and Electrical components.

07. 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 connection of a 3 3-phase induction motor?

Depending on the supply voltage, the three-phase induction motor can be connected in star or delta connections. There are 6 separate windings in a three-phase motor, 2 for each phase. During the motor manufacture, the internal construction and connections of the coil within the motor are specified.

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 a power supply voltage of 400 V, the phase voltage (voltage between the line conductors) is about (9230 V )each. In delta wiring, the ends of the three winding phases are combined and connected to the individual phases.

What is a 3-phase star and delta connection?

Further, the 3-phase electric power supply system can be arranged in 2 ways. They are Star (also called Y or Wye) or Delta (Δ). Star Connections were mainly required for the Power Transmission Network for longer distances, whereas Delta connections are mainly in Distribution networks and are used for shorter distances.

What are the 3 types of 3-phase motors?

Types of Three-Phase Motors. Plain or squirrel cage induction motors. Double squirrel cage motors. Slip-ring or wound-rotor induction motors.

Are all 3-phase motors AC or DC?

All DC motors were single-phase, or AC motors could be single-phase or 3-phase. AC and DC motors use the same principle of using an armature winding magnetic field except with the DC motors, the armature rotates while the magnetic field doesn't, the rotate.

Read more Single Phase Wiring


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