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.
A limit switch is an electromechanical device operated by a physical force applied to it by an object limit switches are used to detect the presence or absence of an object these switches were originally used to define the limit of travel of an object and as a result they were named limit switch.

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