Duty is 3.70% at the third-country rate, but EBA gives Bangladesh-origin transformers 0% — so the 21% Dutch VAT is the charge that moves the landed cost. Eight steps, Rotterdam to site.
A German buyer's checklist for power transformers from Bangladesh: rating-plate specification, EU TARIC duty under heading 8504, 19% import VAT, CE marking and IEC 60076 tests.
Duty is 0.00% on the main power transformer codes, so import VAT is the charge that moves the landed cost. Here is the full build-up, with a worked example in pounds.