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DIRECT ON-LINE (DOL) starter: Direct On-Line is the simplest and cheapest method used for starting three-phase motor. Dol is used for up to 5 HP motor. dol starter is more popular due to the low price.  It connects the motor directly to supply without a reduction in supply voltage and apply full line voltage to 3 phase motor.this is the main disadvantage of dol starter.HP motor required special unit called a motor starter.  Three phase induction motors control and power circuit consist MCB or fuse unit which connected in series with the supply. Power contactor, thermal Overload relay for protection and stop and start push button. Working Principle of Direct online starter (DOL Starter ) : 1) To start the motor, start push button is pressed. After that, the main power contactor coil energized due to electromechanical action and this latch contactor pole.it applies full line voltage to the motor terminals. and the motor starts running. The motor will draw a very high inrush curr...