Quote Originally Posted by Firebottle View Post
I know it is bad form to comment on a sales thread but these will not do 3A.

Look at the transformer rating, 2 secondaries of 1.25A = 2.5A in parallel but AC.
Take the transformer utilisation factor and you are looking at about 2A.

This is a very common mistake with Chinese psu's as well.

I may be being too simplistic here, but these are 30VA transformers, which ties up with the 2 x 1.25A @ 12v secondaries (2 x 12 x 1.25 = 30). Does it not follow that when delivering 5v, the maths suggests a theoretical 6A, and therefore a real 3A?