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The basic difference in 4 point starter when compared to 3 point starter is:

The basic difference in 4 point starter when compared to 3 point starter is: Correct Answer The holding coil is removed from the shunt field circuit

Four-point starter:

The four-point starter works as a current controlling device in the deficiency of back EMF while it starts running off the DC motor. A four-point starter also works as a protecting device. The main difference between a 4-point starter compared to a 3-point starter is, the holding coil is detached from the shunt-field circuit.

The 4-point starter uses four terminals for speeding up the motor. These four terminals namely, armature terminal (A), field terminal (F), and the line terminal (L).

  • NVC (No Volt Coil): The connection of a four-point starter can be done in parallel with the field coil
  • The line terminal (L) is connected to a positive supply
  • The armature terminal (A) is connected to the winding of an armature
  • The field terminal (F) is connected to the field winding
  • It is provided as not to affect the current flowing through 'Hold on' coil even when the field current changes

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What is the basic difference that a four-point starter has in it when compared to a three-point starter is:
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