How about this small # toroidal transformer?

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I see a datesheet of transformer as attach, so small and so big power!
Would you tell me is it a good quality transformer?

487W
Diameter=123
High=57
 

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3.2kg and 487VA seems about right.
primary wire gauge is very small @ 0.33sqmm carrying 6.4A/sqmm.
secondary wire gauge is just as bad @ 1.3sqmm carrying 6.1A/sqmm.

This transformer is likely to have a fairly high regulation for it's rating and will run a bit hotter than one with more copper.

The low voltage secondaries are just about what is expected of current types.
 
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