Answer Posted / vincent omwikha
.To control the starting current of the motor thus avoiding
overheating of the windings.
.To avoid undervoltage hence tripping of other equipments
on the same line i.e for big motors
.Able to vary the speed of the motor
.Provides different starting/stopping points of the same
motor.
.Provides control measures of overcurrent,earthfault i.e
overload relays,circuit breakers,fuses
.Provides power isolation mechanism when one works on the
motor i.e fuses, breakers, isolators
.Able to know the current taken by the motor i.e ammeters
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