DOL is the simplest form of motor starter that connects the motor directly to the power supply. It consists of a magnetic contactor that connects the motor with a supply line & an overload relay for protection against overcurrent. There is no voltage reduction for safe starting a motor. Therefore the motor used with such starters has below 15/20 hp rating. It has two simple push buttons that start & stop the motor.
Advantages of DOL Motor Starter
- it has a very simple & cost-effective design.
- It is very easy to understand & operate.
- it provides high starting torque due to the high starting current.
Disadvantages of DOL Motor Starter
- The high inrush current can damage the windings
- The high inrush current causes voltage dip in the power line.
- It is not suitable for heavy motors
- It can decrease the lifespan of a motor
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