Contactor Wiring Diagram For 3 Phase Motor

This post is about the magnetic contactor wiring diagram for 3 phase motor. In the post, you will learn step by step how to wire the magnetic contactor, thermal overload relay, MCCB ( molded case circuit breakers), Normally Open push button switch, normally close push button switch, Red and Greenlight indicators. This will be the complete guide of a direct online starter for 3 phase motor. And in the next post, I will share a diagram about the contactor wiring with timer. 

Magnetic contactor wiring diagram for 3 phase motor

Before we start about the complete wiring of direct online starter or contactor wiring with MCCB and thermal overload relay. First, we discuss all things step by step.

Magnetic contactor

A magnetic contactor is a type of electromagnetic relay or switch. Which we use for controlling the electrical devices such as compressor, 3 phase motor, single phase motor, etc. In short, it's a type starter for the electrical machines. A contactor has 3 types of contacts. Main contacts are used for controlling the load or machine. Auxiliary contacts which used for different types of interlocking systems. And coil contacts where we provide the electric supply to operate the magnetic contactor. 

Also read:

What is a magnetic contactor and how it works?

What are the auxiliary contacts of a magnetic contactor?

Contactor working animation 

Direct online starter animation 

MCCB Circuit Braker (Molded case circuit breaker)

As you know there are different type of circuit breakers, just like MCB, MCCB is also a well-known breaker and mostly used in the electrical distribution board. And a 3 phase panel board is incomplete without an MCCB circuit breaker. The MCCB circuit breaker can be 2 poles, 3 poles, and 4 poles. For single phase we used the 2 poles, for 3 phase we used the 3 poles,s, and three phase 4 wire system we used 4 pole MCCB circuit breaker. In today's magnetic contactor wiring diagram for 3 phase motor we used the 3 pole MCCB circuit breaker.

Thermal overload relay 

A thermal overload relay is a protection device that is used to protect the motor from overloading and over current flow. When the overcurrent flow in the circuit, the thermal overload relay trip the motor.

In thermal overload relay, we have current adjustment, "H" and "A". where "H" for hand, and "A" for automatic resiting. NC and NO points, where NC for a starter or motor tripping and NO for tipping signal.

Normally Open Push Button And Normally Close Push Button Switch

A normally open push button switch is a normally open circuit which is used for switching On the circuit. And normally close push button is an internally closed circuit in a normal state. Which is used for switching off the circuit. 

Lights Indicators

In the contactor wiring diagram 2 light indicators shown, green and red. The red will glow up when the motor trip and green light indicator will glow up when the motor start. 

Now let's talk about the magnetic contactor wiring diagram for 3 phase motor. In the below diagram, i have shown an MCCB circuit breaker, contactor, thermal overload relay, NC/NO Switch, and light indicator. 

First, we will start with the main wiring power wiring. The three phase supply shown in the diagram, L1, L2, L3 which is connected to the MCCB circuit breaker, and after that the supply goes to the magnetic contactor and from the contactor, the supply goes to the thermal overload relay, and from the thermal overload relay, the supply goes to 3 phase motor. In the below diagram the motor connection shown in star connection.

Now come to the control wiring. The NC switch is used for switching off the starter, the normally open push button used for switching off the starter. The neutral wire is connected to the thermal overload relay NC points and from here the neutral supply goes to the contactor coil. A line wire is connected to the overload relay NO points and from other points, the supply goes to the red light indicator. Which will glow off when relay trip.

In the above diagram, "H" means holding wire, and "T" means tach wire. 

Also read:

Dol starter wiring diagram

Phase failure Relay wiring diagram

I hope the direct online starter wiring diagram with thermal overload and light indicator helps you to understand the contactor wiring, however, if you have any questions according to this post you can ask your questions in below comments section. 

Automatic Water Level Controller Wiring Diagram For 3 phase

 Automatic Water Level Controller Wiring Diagram For 3 Phase Motor / Submersible Pump

This post is about the three water pump motor water level controller wiring diagram with thermal overload protected relay, magnetic contactor, 4 pole MCB circuit breaker, and water or liquid- controller. In the diagram the overhead tank and underground tank connection shown with the sensor. Note that this an example of wiring of water level controller, the wiring of the controller can be different according to different types of automatic water level controller. 

Automatic Water/liquid - Controller Wiring with Magnetic Contactor

In the below automatic water level controller for 3 phase motor diagram. 3 phase 4 wire system supply shown. The 4 pole MCB are used for switching supply or on/off the motor. The controller have also an on/off switch. The magnetic contactor is used as a starter for 3 phase motor and thermal overload protected relay used for motor protection in case- of over current flow. The connection of over-head tank sensors and underground tank sensors shown with the controller. However, if want to use the controller with only one tank then make a wire connection with "C", "UH" and "UL". The controller will provide the electric supply to the magnetic contactor and the contactor will switch ON the motor. And when the water tank full completely, The controller switch off the supply to the magnetic contactor. And the motor will be switch off. The same connection can be used with a submersible pump motor.

I hope this fully automatic water level controller wiring diagram for a three-phase motor with a magnetic contactor helped you. Now if you have needed automatic water level controller wiring with diagram for submersible pump motor or with the direct online starter. Then you can tell me in below comments section. I will try my level best to provide the best answers. 

3 wire washing machine motor wiring diagram

In this post, you will learn about the 3 wire washing machine motor wiring diagram. As you know that we have a two-way switch, washing machine timer, bell, light indicator, and washing machine motor. First, we talk about the parts step by step.  And then we talk about the complete wiring of 3 wire washing machine motor.

Washing Machine Motor Capacitor Wiring Diagram With Timer

Parts of 3 wire washing machine.

Tow way switch: A 2-way switch is used in washing machine wiring to switch the motor in one or 2 direction.  we switch the motor on one side. It means that the motor will run only in one direction. And if we switch the motor to two directions. The motor will run in both directions. For a small reset, the motor will stop, and then the motor will start in 2nd direction-. The motor will start the clock and anti-clockwise by using the washing machine timer.

Washing Machine timer: A timer is used in the washing machine, which can be in different shapes and different types. The wiring wire of the washing machine can be a different color and a different number of wires but it's working will always the same. In the below 3 wire washing machine motor wiring diagram. A 6 wire timer is used. The timer working is to run the washing machine motor for a specific time. By using the timer the motor run clock and anti-clockwise. This timer also on the bell when it's complete the washing timer for a small time. And then it's switch off the motor and bell.

Bell And Light Indicator: A bell also installs the washing machine, this bell switches for small-time when the timer completes his time. Also, a light indicator shows the incoming electric supply.

Washing machine motor: The main part of a washing machine is the motor. The washing machine motor winding is not different from a single-phase induction motor but in the motor they both winding is made from the same number of wire gauge. A 4 pole motor is used in a washing machine motor. which has 3 wire. The one wire is common and the 2 other wire is for the capacitor. Also, read the below article which helps you that how to test the washing machine motor.

Also read
How to fix washing machine problems 

Capacitor : A capacitor is used in washing machine to run the washing motor. This capacitor will be a running capacitor. But the value of capacitor can be change according the motor.


Now come to the wiring diagram.

In the above 3 wire washing machine motor wiring diagram. The main supply one wire is connected to the washing machine motor common connection point. Same from the wire the light indicator and buzzer wired.

The 2nd wire is going to the timer black wire. The timer has 5 more wires. In which the blue for the buzzer. The green or brown goes to a two-way switch. A Two-way switch has one three output terminals. In which we use only two. The center point will be no used and when switch on the center position. The washing machine will be off.

The timer red wire will connect to a two-way position point of the 2-way switch. yellow is connected to a one-way position point of the switch and also the wire goes to the motor. The second yellow wire will connect to the 3rd wire of the motor. A running capacitor will connect between yellow wires.

DOL Starter Wiring Diagram 3 Phase Motor

We use three-phase motor mostly in many places, in this post you will learn the dol starter wiring diagram 3 phase with complete circuit breaker, contactor, and overload relay diagram with step by step. We required some electrical things for three-phase motor wiring which are below.

Requirements
3 phase induction motor
3 core electric cable
Three-phase 4 wire system supply (three-phase and one neutral)
A circuit breaker
A contactor or starter
An overload relay
and flexible wiring cable for controlling wiring
Normal close push button
Normal open push button

Before we start talking about the wiring and wiring diagram, first we disuse the above substance. We required 3 core cable, a three-core cable is a cable that has an internal three electric cable which mostly in red, yellow, and blue colors. The three-phase 4 wire system supply means that we need 3 phase electric supply and one neutral wire. Note that we use the neutral wire for contactor coil wiring which we called the control wiring.
We also required the circuit breaker which is 3 pole circuit breaker or circuit breaker which can cutoff the 3 electrical connection at the same time.

A normal close push button (NC) means that we need a push-button which normally has a close electric circuit and when we push it then the button switch off the connection or change to the open electric circuit.
The normal open push button means that we need a push-button which have an open electric circuit in a normal state and when we push it then it's changed to the close electric circuit.

Dol Starter wiring diagram for three-phase motor

To wire a 3 phase motor the first thing to wire is a circuit breaker which is a disconnect and connecting point then we will get the supply from the circuit breaker and connect the supply to the contactor or starter and then to the overload relay. We connect the circuit breaker, contactor, and overload relay in series between electrical supply and motor as shown in the below diagram.

Contactor and Overload Relay Wiring

In a contactor, we have a magnetic coil that is used for switching. We have also NC and No point in a contactor which we can use for many connections. In the overload relay, we have input and output points. In normally overload points have a close electric circuit between point but whenever the ampere or load is getting high the overload relay switch off or make an open electric circuit between these two points or connection. So we wire the overload relay in series between the contactor coil current.
So for contactor wiring first of all connect the neutral wire to the contactor coil first terminal and then connect a wire from the one output terminal of the circuit breaker which is opposite or phase current for the contactor coil. In this process, the control wiring which contactor wiring is also controlled by a breaker, and when we switch off the breaker, the contactor will stop working auto.
The control wiring wire which connects from the breaker output terminal will go to the NC push button and then from NC push to the overload relay and NO push button as shown in the above diagram. Then we connect a wire between the 2nd terminal of overload relay and this wire goes to the NO point of the contactor and then from NO point wire is goes to the 2nd terminal of contactor coil.
Then in last, we connect a were between NO push button switch and contactor 2nd terminal of the coil where we connect the phase wire of contactor as shown in the above diagram. And this wire connection is called tech current.
Final word
Note that in all wiring use the best quality breaker, push-button switches, contactor, and overload relay. If your overload relay is not good then it will be not trip and if the overload relay does not trip or not switch the point then it will be a case of your motor burn. Note that do all wiring control able from circuit breaker as I showed in the above diagram.
Note that always connect the earth wire to the motor, and adjust the overload relay ampere by using the adjustment switch.

Message
I spend more than 2 hours on this article writing and designing DOL Starter Wiring Diagram 3 Phase Motor diagram, so if you learn some important things then it's your responsibility to share. Now if you have any questions regarding the 3 phase motor wiring diagram then you can ask me in the below comment section.

Forward Reverse DC Motor Using Relay

This post is about the forward reverse dc motor using a relay. In this post, I am sharing a diagram in which a dc motor forward reverse connection is done with a double pole double throw relay. For this type of connection, you can also use the double pole double throw switch. However, next, I will share a diagram of forward reverse dc motor using the DPDT switch.
In the diagram, the DPDT relay coil is 12 DCV. This relay is also available in 24 DCV, 120 ACV, 220 ACV. You can use it also. However in this diagram only the 12 DCV electromagnetic relay use. A 12 Volts battery is shown which is used to power the dc motor and relay.

Forward Reverse DC Motor Using Double Pole Double Throw Relay 

In the above forward reverse DC motor using relay (double pole double throw relay) wiring diagram. two one way switches used. A switch is used to turn DC (direct current) motor forward and reverse. And the second switch which is connected in the way of positive wire is used for the switch on/off the motor.

Also Read
DPDT Relay Wiring Diagram

Double Pole Double Throw Relay Schematic Diagram

This post is about the double pole double throw relay schematic diagram. In this post, you will complete learning about the working of a double pole double throw relay, also known by the name of the DPDT relay. Basically, a double pole double throw relay is an electrometric relay which two common points, 2 normally close and 2 normally open points. Also 2 coil connection points.  The relay is used for many things, like controlling AC/DC loads, automatic switch, as changeover for generator or double electric supply, DC motor forward reverse, AC single phase motor forward reverse, and so on...

Double Pole Double Throw Relay Schematic

DPDT relay is available in different shapes and types according to rating coil voltage and contacts amperes. A 8 pin finder or glass type relay is also a type of dpdt relay. Here I showed a dpdt power relay with a diagram.

In the above double pole double throw relay schematic diagram. I have shown a power relay with a schematic diagram. Also a 8 pin glass finder types relay with also a dpdt relay with a diagram. In the diagram, A1 and A2 is coil terminals of the electromagnetic relay. The 1 terminal is common which is normally close with 2 and normally open with 3. The 4 is common and normally close with 5, normally open with 6. Here some more diagrams which helps you more...

Also read:

14 pin relay with wiring diagram
Staircase timer connection with relay

Note that DPDT Relay can be in different shapes and can be used for different controlling. The small type of double pole double throw relay mostly used for controlling other relays like magnetic contactors. (Also this relay can work as auxiliary contacts with magnetic contactor). And the big-size DPDT relay, also known as power relay is used a high load according to relay ratting. If the relay is 30 Ampere then we can easily control a single-phase load with is less than 30 ampere. However, we will further talk about this..... This post is only about the double pole double throw relay schematic diagram.

How to Make UPS Inverter at Home Diagram

After this post, you will complete learning "how to make UPS inverter at home diagram". In this blog, I also share how to connect the UPS to battery or batteries. How to wire the ups for home wiring. Or how a UPS inverter wiring. In this post, i will teach you how to make ups inverter at home. There are different types of UPS/inverter are available in the market. And you can buy it from any offline or online markets according to your load.

How to make a UPS/Inverter at home

In the market, the circuit is available which also use for making a UPS at home. In this post, I am sharing a complete UPS internal wiring diagram. In which the controlling kit, UPS module, UPS transformer, outlet, fuse, on/off switch, etc are shown.

In the below "UPS/inverter how to make diagram" all the connection is shown step by step

In the above UPS/Inverter transformer, the transformer bobbin size is 2'' x 3''. The 19 SWG and 11 SWG used in the coil.  The Winding turns and the winding formula is shown in the above diagram. I hope after this diagram now you will be completely understood the complete UPS (uninterruptible power supply) wiring. These below articles and diagrams also help you...  Note that this is a Desi UPS wiring diagram.

Also, read...
How to connect ups to battery
how to connect ups to two battery
how to wire solar panel in series connection
how to connect solar panel in parallel connection
how to wire ups for home wiring with solar panel and solar charge controller

DOL Starter Diagram - Direct Online Starter for 3 Phase Motor

This post is about the dol starter diagram. As you know the dol starter is a starter that contains a magnetic contactor, overload protection relay, and NC/NO push button switches. I also share the dol starter wiring diagram. In which I have shown the MCCB circuit breaker (molded case circuit breaker) magnetic contactor and thermal overload relay and complete controlling and power wiring. In today dol starter diagram. I will only show the symbol type diagram. This diagram contains the complete wiring of a direct online starter.

DOL (Direct Online Starter) Wiring Diagram

In the above dol starter diagram. The R, Y, B is the three phase 380 volts supply. The coil of the contactor is 380 VAC. And the normally open and normally close push button shown. the contactor connection with thermal overload relay and the motor connection with overload relay is shown. Also, the earth connection is provided to the motor.

3 Phase Current Transformer Wiring Diagram

3 phase current transformer wiring diagram for 3 phase load (ampere) testing. As you know that we use the current transformer to measure the current. For testing the current (ampere) running to load we use two types of amp meter. In which one series type which is wired in series between load and supply. And 2nd is a current transformer type which is wired with a current transformer to measure the current. We can wire a current transformer for single phase and also for 3 phase. The current transformer is always used for line ampere testing. For 3 phase system ampere testing every Line has its own current transformer. And these current transformers further connected with a 3-ampere meter or one-ampere meter and ampere testing selector switch.

For better understanding also read below

How to wire current transformer with digital ampere meter
Ampere meter selector switch wiring with current transformers

How to 3 phase current transformer wiring diagram with ampere meter

Note that if your ampere meter is 100/5A then used only 100/5A ratio current transformer. In the below 3 phase current transformer wiring diagram with amp meter. 3 CT coil and Amp testing meters are shown. The current transformer wiring for each meter.

You can wire the current transformer for three phase system as shown in the above diagram. However, if you want to test 3 phase ampere with an only one-ampere meter. Then use an ampere selector switch with the current transformer. For that, you need to wire all 3 current transformers with an amp selector switch. And from the selector switch, the two-wire supply will go to ampere meter. From the selector switch, you can test at each line(phase) ampere.

How To Wire a 4-way Switch Wiring Diagram

This post is about the 4 way switch wiring diagram. A 4 way switch is a type of switch which is used to switch off/on a light or other electric devices from multiple places. Today in this below 4 way switch wiring diagram. A light is controlled from 3 places. This light bulb can be switch on/off from each switch. For example, if a person switch on the light bulb from the first switch then he/she can switch off it from the 2nd or 3rd switch.

How To wire a 4 way switch diagram

In the below 4 way switch diagram, a light bulb is controlled from 3 switches. The first and 3rd switches are 3 way switch, (note that it's also known with the name of 2 way switch). And 2nd switch is a 4 way switch.

The neutral wire is shown black color and line wire with red color. The green color is used for earth or ground wire.

I hope this diagram help you very much if you want to learn how to do staircase wiring then the below post and diagram is for you.

How to control one light bulb from two places
How to do stair case wiring with different methods