Quote Originally Posted by mygoggie View Post
Good point, I will double check on this as I am now concerned that the EATON Aux contacts cannot handle 65A. As far as I know the regs (and commons sense), the contactor (aux in this case) for the neutral must be the same current rating as the L1-L3 ratings. Correct me if I am wrong.
Yes, essentially you need a 4-pole changeover switch, not a 3-pole with an aux contact. Whilst the neutral current may be low if it's a balanced load across the 3 phases the neutral contact must still be able to make and break the worst possible case load. Also if the neutral contact is late make or early break there will be a large voltage spike during changeover.