Where can I get a basic automatic start circuit for a generator from ?

I have a large generator, its converted from 3 phase to single phase, but I need an automatic start circuit for a single phase supply, when the mains fails it starts and automatically changes over to generator supply. The old 3 phase circuit is no good, as it senses phase imbalance and volts loss, which is no good... show more I have a large generator, its converted from 3 phase to single phase, but I need an automatic start circuit for a single phase supply, when the mains fails it starts and automatically changes over to generator supply. The old 3 phase circuit is no good, as it senses phase imbalance and volts loss, which is no good on single phase - I tried linking all inputs, but it still does not start on mains failure. Has anyone a basic relay circuit anywhere ?? Thanks ......
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