A three-phase DOL starter is a type of electric motor starter that is used to start three-phase AC motors. The DOL starter gets its name from the fact that it uses a direct on-line start method, which means that the motor is connected directly to the power source without any intermediate steps.
DOL starters are typically used for smaller motors that do not require a lot of starting torque. They are also relatively inexpensive and easy to install. However, DOL starters can be a bit noisy and they can also cause a power surge when the motor starts.
The basic components of a three-phase DOL starter are a contactor, a thermal overload relay, and a starter coil. The contactor is a switch that connects the motor to the power source. The thermal overload relay protects the motor from overheating. The starter coil is used to energize the contactor.
When the starter coil is energized, the contactor closes and connects the motor to the power source. The motor starts to turn. The thermal overload relay monitors the motor current and if the current gets too high, the relay will open the contactor and disconnect the motor from the power source.
DOL starters are a simple and effective way to start three-phase AC motors. However, they are not the best choice for motors that require a lot of starting torque or for motors that are used in applications where a power surge could be a problem.
If you are looking for a starter for a three-phase AC motor, you should consult with a qualified electrician to determine which type of starter is best for your application.
Here is a diagram of a three-phase DOL starter:
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