Wiring Diagram Of A Single Phase Dol Starter

A single-phase DOL starter is a type of electric motor starter that is used to start a single-phase AC motor. It is a simple and inexpensive starter that is commonly used in small motors. The DOL starter consists of a contactor, a thermal overload relay, and a start button.

The contactor is a switch that is used to connect the motor to the power supply. The thermal overload relay is a safety device that protects the motor from overheating. The start button is a pushbutton that is used to start the motor.

When the start button is pressed, the contactor closes and connects the motor to the power supply. The thermal overload relay also closes and starts to monitor the motor current. If the motor current exceeds the set value, the thermal overload relay will open and disconnect the motor from the power supply.

The DOL starter is a simple and effective way to start a single-phase AC motor. It is a reliable starter that is well-suited for small motors.

Here is a wiring diagram of a single-phase DOL starter:

Wiring diagram of a single-phase DOL starter

In this diagram, the contactor is represented by the symbol K1. The thermal overload relay is represented by the symbol OTL. The start button is represented by the symbol S1. The motor is represented by the symbol M1.

The power supply is connected to the contactor coil (K1-A1) and the thermal overload relay coil (OTL-A1). The contactor contacts (K1-1, K1-2, K1-3) are connected to the motor terminals (M1-T1, M1-T2, M1-T3). The thermal overload relay contacts (OTL-1, OTL-2) are connected to the start button (S1-1, S1-2).

When the start button is pressed, the contactor coil (K1-A1) is energized and the contactor contacts (K1-1, K1-2, K1-3) close. This connects the motor to the power supply and starts the motor.

If the motor current exceeds the set value, the thermal overload relay coil (OTL-A1) is energized and the thermal overload relay contacts (OTL-1, OTL-2) open. This disconnects the motor from the power supply and stops the motor.

The DOL starter is a simple and effective way to start a single-phase AC motor. It is a reliable starter that is well-suited for small motors.


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