Can I connect 2 phase 120VAC to a power supply rated for 240VAC input? - All About MEAN WELL Power Supplies

If the two phases are 180o out of phase (split phase system), then yes. The resulting voltage will be around 240VAC, so it can be used with power supplies that has input range of 200VAC-240VAC.If the two phases are 120o out of phase, the resulting RMS voltage will be 208VAC, so it should work, but derating might be needed on some models. For a single-phase operation, you should check the input range of the power supply in its datasheet (derating might be necessary at low input voltage).

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