Many ATS mfgs. are out there. I'm aware of one who has offereings on Delayed/Programmed transition up to 600V, and 4000Amps. GE Zenith is one. If you are in US, refer to an ATS mfg. how meets UL1008 standard.http://www.gedigitalenergy.com/ats
One way to avoid "out of phase" transfer is using an Automatic Transfer Switch (ATS) with phase rotation mismatch sensing on both Normal (utility) and Emergency (typically generator). This controller sensing will not allow transfer is phase rotation is incorrect.
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