Dol starter connection diagram:

This diagram shows how to make a Dol starter connection diagram. In this circuit, we use a TP MCB ( Tripple Pole Miniature Circuit Breaker ), two magnetic contactors, an overload, and a single-phase motor. First, we need to connect the MCB with a power source, then connect two magnetic contactors and overload and motor with MCB. Now this circuit is ready for use. If you want to know more about this circuit please check our youtube video below the post.


Diagram of Dol starter connection:

Dol starter connection diagram

Components needed For this Project:

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

  1. TP MCB 20A [See Buy Click Amazon]
  2. Magnetic Contactor 40A [See Buy Click Amazon]
  3. Motor Protector Overload [See Buy Click Amazon]
  4. 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 Dol starter connection diagram:

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. 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.

04. 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 DOL starter?

A direct line starter (DOL) is a type of motor starter that connects the electric motor directly to the line voltage. Direct Line Starters operate as a basic stop/start switch for an electric motor and are often fitted with overload protection devices to prevent short circuits and overheating.

What is the full form of DOL in electrical?

Direct On-Line (DOL) method is the simplest starting method for a 3-phase pump set. L&T Electrical & Automation (E&A) offers two variants of the DOL method – starter and controller. DOL starters are basic electrical starters with contactors and relays for ON/OFF operation and overload protection of the pump set.

Why do we use a DOL starter?

The applications of DOL starters are primarily motors where a high inrush current does not cause an excessive voltage drop in the supply circuit (or where this high voltage drop is acceptable). Direct online starters were commonly used to start small water pumps, conveyor belts, fans, or compressors.

How do you size a starter?

To properly size a NEMA-style full-voltage, across-the-line motor starter, the only information required is the motor horsepower supply and voltage. Sizing an IEC starter of the same type requires knowing the motor load, the duty cycle, and the full load current. NEMA standards list 10 sizes to cover tow-hp to 900-hp motors.

What components are used in the DOL starter circuit?

Starters were the key components that protect the induction of the motor against this overvoltage. Among the starters employed in the process, the Direct On-Line (DOL) starter was the simplest form available in power electronics. The DOL comprises the circuit diagram breaker, overload relay, and electromagnetic contactor.

Read more Single Phase Wiring


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