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Answer Posted / s raghavendra
for different types of applications different kinds of switches are required . for starting of induction motors especially 3-phase squerriel cage induction motors at start it consumes more current to stop that we keep the switch in star position and after it attains 70-80percent of rated speed switch is kept in delta mode as already backemf will be generated which reduces currrent and like this there are many applications......................................
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