Dol Power Circuit. 1 to start the motor start push button is pressed. The circuit breaker is used for protection against short circuits while the overload relay protects the motor from overloading.
A dol motor starter contains protection devices and in some cases condition monitoring. Typically the contactor will be controlled by separate start and stop buttons and an auxiliary contact on the contactor is used across the start button as a hold in contact. Despite this direct connection no harm is done to the motor.
The circuit breaker is used for protection against short circuits while the overload relay protects the motor from overloading.
In a dol starter an induction motor is connected directly across its 3 phase supply and the dol starter applies the full line voltage to the motor terminals. The contactor is used for starting and stopping the motor where the green and red buttons are connected. The direct on line motor starter dol consist a mccb or circuit breaker contactor and an overload relay for protection. The dol starter is made of a circuit breaker or mccb or fuse an overload relay and contactor or coil.
