Answer / boo123pavani

In three point starter NVR (no voltage relay)is series with
Shunt if voltage falls certain value NVR De energized due to
insufficient magnetic field and motor turned off. But in
four point starter NVR energized directly from DC supply
thus the draw back of 3 point starter rectified


A motor can be run for a higher speed than normal speed by reducing the field current. reduced the field current may not produce enough magnetic force to hold the handle in on position. so handle returns to off position. this is the disadvantage of three point starter.this is the advantage of four point starter. it will not returns to off position

Answer / rahul jadhav

No diff.

Answer / pritish

the difference between a 3 point and 4 point starter is, 4 point starter can be used for over load protection where as 3 point starter can not be used for over load protection and other difference is 4 point starter has 4 terminals and 3 point as three terminals.

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