DOL starter a dol starter is Direct On Line starter or across the line starter is a method of starting of a 3 phase induction motor in 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.
what is timer
A time switch also called a timer switch, or simply timer is a timer that operates an electric switch controlled by the timing mechanism. A countdown time switch switches power, usually off, after a preset time.

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