Step down transformer 220Vac ~ 380Vac
Off the shelf small power supplies are very cheap and common for normal single phase mains voltages .Their internal voltage clearances are rated for single phase mains .Most small SMPS are flyback which gives a simple low cost design.The efficiency and power factor of these units is generally poor .If they do not specify these important parameters then assume the worst and specify your 480 to 220 VAC mains transformer to have a VA rating of at least twice the output rating of the supply .This means for you 20VA or better .Do not go crazy on the VA rating because you will be wasting lots of money and power if you used say 200VA .Remember that the proposed power transformer under no load will waste more power than the SMPS .This is relevant for meeting energy efficiency specifications in some countries .You will find that this safe bulky mains transformer approach is cheaper and easier than getting a small 380VAC SMPS .Do fuse the primary of your transformer and get your wiring checked by a registered person .