I'm on my phone, but at 110v it's a site transformer.
I believe yellow are 110v site transformers, blue is 240v.
Mine came from ebay.
I'm not sure about that - My 240V:240V 2000VA isolation transformer, bought from ebay in the UK looks like a site transformer, it has the same circular 3 pin output connector as a site transformer, and it is yellow, but for sure it is 240v in 240v out
yellow plugs and sockets are 110v . blue is 220v . same with external wire colours . plugs and sockets are keyed to try and stop you putting in wrong holes
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