3-Phase Motor Starter Wiring Diagram:

This diagram shows how to make 3 Phase Motor Starter Wiring. In this circuit, we use an SP MCB Circuit Breaker ( Single Pole Minature Circuit Breaker ), a TP MCB ( Tripple Pole Minature Circuit Breaker ), a magnetic contactor, an overload protection relay, and a 3-phase motor. First, we need to connect the TP MCB with the power source, then connect the Magnetic contactor and SP MCB with the TP MCB, then connect the start-stop switch with SP MCB and contactor, then connect the motor with the contactor and overload. Now this circuit is ready for use.


Diagram of 3-Phase Motor Starter Wiring:

3 Phase Motor Starter Wiring Diagram

Components needed For this Project:

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

  1. SP MCB 10A [See Buy Click Amazon]
  2. TP MCB 20A [See Buy Click Amazon]
  3. Magnetic Contactor 40A [See Buy Click Amazon]
  4. Push Button NO Switch [See Buy Click Amazon]
  5. Push Button NC Switch [See Buy Click Amazon]
  6. 3 Phase Motor (5 HP) [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 Starter Wiring:

01. SP MCB:

In single-pole MCB, Switching and protection are Affected in only one Phase. Single phase supply to break the phase only. A single Pole breaker is Typically used with 120-volt Circuits, and a 6-20 amps Miniature Circuit Breaker. They are constructed with one Line Wire and one Neutral wire. A Single Pole switch is the most basic General-Purpose switch that you use to Control a light or another device from one location. These Switches have 2 Brass-Colored screw Terminals Connected to the hot Power source wires. Pole refers to the number of Circuits Controlled by the Switch SP Switches Control only one Switch Electrical Circuit.

02. 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.

03. 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.

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.

05. 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.

06. 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.

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Frequently asked questions

What is a motor starter circuit?

A motor starter is an electrical component designed to start or stop a motor safely. Like a relay, a motor starter switches power on or off. Unlike a relay, a starter also provides overcurrent or low-voltage protection. A motor pump starter has four main functions, Start a motor safely.

What is the starter control circuit?

This is the other motor starter circuit diagram, which operates the contactor to turn it on or off. The contactor main contacts are responsible for allowing or interrupting the flow of current flow to the motor. To do this, the contacts in the control circuit diagram are either opened or closed.

How to wire a 3-phase motor with 6 wires?

The 6 wires are usually labeled U1, U2, V1, V2, W1, and W2. To connect the motor in a Wye configuration, you should connect U1, V1, and W1 together at one end of the motor, or then connect U2, V2, and W2 together at the other end. The remaining ends of U2, V1, and W2 would be used as the 3-phase power supply inputs.

Why does a 3-phase motor need a starter?

A motor starter, often known as a contactor, provides a way to start a three-phase motor with a control voltage usually less lethal than the line voltage for said motor, it allows for overload protection for that same motor.

How many wires are in a 3-phase motor?

The most common types of 3-phase motors are unpacked from their boxes with nine wires needing to be connected from the box on the side. This is typical of motors that could be connected for high or low voltage, and they may be arranged with Wye and Delta internal connections.

Read more Single Phase Wiring


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