3 Phase Motor Starter Wiring:

This diagram shows how to make 3 Phase Motor Starter Wiring. In this circuit, we use a TP MCB ( Tripple Pole Miniature Circuit Breaker ), a DP MCB (Dripple Pole Minature Circuit Breaker ), a magnetic contactor, a start switch, a stop switch, a 3-phase motor. First, we need to connect the TP MCB to the power source, then connect the contactor, then connect the DP MCB and start-stop button with TP MCB. Lastly, we need to connect the 3-phase motor.


Diagram of 3 Phase Motor Starter Wiring:

3 Phase Motor Starter Wiring

Components needed For this Project:

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

  1. DP MCB 20A [See Buy Click Amazon]
  2. Magnetic Contactor 40A [See Buy Click Amazon]
  3. Push Button NO Switch [See Buy Click Amazon]
  4. Push Button NC Switch [See Buy Click Amazon]
  5. TP MCB 32A [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. 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.

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. 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.

04. 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.

05. 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.

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Frequently asked questions

How is a 3-phase motor starter?

A three-phase motor starter consists of an overload relay and contactor. When the coil on the contactors is energized, this creates an electromagnetic field that pulls the contacts the closed and transmits the line power supply to the motor.

Can we start a 3-phase motor without a starter?

Yes, a three-phase induction motor can start without a starter in some cases. Small motors can often be started directly by connecting them to the power supply, while larger motors may require a starter to control the starting current flow and provide a smoother start-up.

What are the 3-phase wires?

Three-phase installations are those formed by three different alternating currents that divide the installation into several parts which are reached by a constant power flow. Their standardized powers are currently adapted to 400 volts. Three phases have four wires: three actives (called phases) and one neutral.

Why do we use the starter in the 3-phase motor?

The starter is required for a phase induction motor because when we start the motor high excessive current flow is produced. The high current will cause the motor windings and it will be burn winding. The function of the starter is to limit the high starting current flow.

How do you control a 3-phase motor?

The speed control of a 3-phase induction motor is obtained by changing the supply voltage until the torque required by the load is developed at the desired speed. The torque developed by the induction motor is directly proportional to the square of the prow supply voltage and the current flow is proportional to the voltage.

Read more Single Phase Wiring


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