New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Neale]

I think I use a C type MCB - more surge-resistant than a B (the usual domestic type) but trips a little more easily than a D. But that's with a 650VA transformer. However, without analysing in too much detail, I doubt that the transformer difference is that significant and it's the size of the capacitors that matters more. I would tend to go with C type, I think.