Hello friends,
:confused: My question is what is Motor Protection Circuit Breaker? How it is useful for motors in place of MCB or Moulded Case Circuit Breakers? For what motors its in use majorly and would like to know its technical details??

The first thing that I would try is the following search as outlined in the following link. You might find some advise there. I hope that you do.

Motor protection circuit breaker - Google Search (http://www.google.com/search?hl=en&safe=off&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=Motor+protection+circuit+breaker&spell=1)