Dol Starter Control Circuit Wiring Diagram:

This diagram shows how to make Dol Starter Control Circuit Wiring Diagram. In this circuit, we use a stop switch, a start switch, an SP MCB ( Single Pole Miniature Circuit Breaker ), TP MCB ( Tripple Pole Minature Circuit Breaker ), a magnetic contactor, an overload, two indicator lights, a 3 phase motor. This circuit is very simple and easy to make. If you want to know more details about this circuit please check our youtube video below the post and stay with us for more updates.


Diagram of Dol Starter Control Circuit Wiring:

Dol Starter Control Circuit Wiring Diagram

Components needed For this Project:

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

  1. Push Button NC Switch [See Buy Click Amazon]
  2. Push Button NO Switch [See Buy Click Amazon]
  3. SP MCB 10A [See Buy Click Amazon]
  4. TP MCB 20A [See Buy Click Amazon]
  5. Magnetic Contactor 40A [See Buy Click Amazon]
  6. Motor Protector Overload [See Buy Click Amazon]
  7. 3 Phase Motor (5 HP) [See Buy Click Amazon]
  8. Indicator Light 220v AC [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 Dol Starter Control Circuit Wiring:

01. 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.

02. 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.

03. 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.

04. 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.

05. 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.

06. Overload Switch:

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.

07. 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.

08. Indicator Light:

An indicator lamp just Sounds Technical, Sometimes it is called a Supervisory light Indicator. Indicator lights are amber in color and can be located at the Front, the Rear, and Sometimes at the Side of the car on both the left And Right-hand sides. The Common colors used by Indicator lamps are red, yellow, blue, white, and green line system. A Panel Indicator Lamp Generally has up to 5 Differently Colored Segments to Indicate Various Conditions on the Machine or Process system.

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Frequently asked questions

What is the working principle of a DOL starter?

A DOL starter also known as a Direct On-Line starter is a method of starting a three-phase induction motor. In a DOL Starter, a three-phase Induction motor is connected directly across a three-phase supply, and the DOL starter applies the full line voltage to the motor terminals.

What components are used in the DOL starter circuit?

Starters are the key components that protect the induction motor pump against this overvoltage. Among the starters employed in the process, the Direct On-Line (DOL) starter is the simplest form available in power supply electronics. The DOL comprises the circuit breaker, overload relay, or an electromagnetic contactor.

Is Dol starter a soft starter?

With a DOL there will be larger spikes in current flow as the motor starts. With a soft starter, the time the motor gets us to speed is slower or more controlled. While a DOL gets the motor pump up to speed almost instantly.

Is Dol a star or a delta?

These applications require Direct-On-Line starting as below. DOL starting is essentially starting in one step, unlike Star-Delta (two- steps). DOL is generally only used for smaller current loading, as start current levels can exceed 8 to 10 times the running current.

Can we use a DOL starter for a 10-hp motor?

Yes. We can start a 10 HP induction motor using a DOL starter as this starting method is preferable for motors having less than 10 KW i.e. 13–14 HP and for large motors, the star delta method is preferable. However, It does not reduce the starting current flow of the motor.

Read more Single Phase Wiring


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