It is of my opinion that a CB is only designed as a circuit breaker, not an isolator, the increased operation of the mechanism may cause it an early death.
I just want to qualify what I said above.
I don't think that a CB should be used to break full-load amps un-necessarily that is what switches and contactors are made for.
I like the idea of the contactor because all you then need is a simple control circuit and that the switch only carries the control circuit current.
Contactors also handle inductive load currents a lot better than any switch, as long as they have a certain safety margin applied to them.
Just wanted to clarify my thinking at that idea.
