Answer Posted / srikanth shreenidhi

Whenever DGs are paralled & synchronised one should have a
common neutral.If neutral of one generator fails
automatically the neutral of other dg sets which is on a
common bus takes over.Whereas if the DG has a 4 pole
breaker and neutral fails it will be impossible for the
system to continue as all the dg sets will have a switched
neutral.
Secondly in case of neutral/contactor failure the user will
have to change only the contactor instead of the whole
breaker

However when only one DG set is used we always go with 4
pole breaker.

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