One question each, answered from the bench

Ratings move between codes that read almost the same

The single most common source of a wrong order here is a code compared by eye. Two strings differing in one segment can differ in series range, continuous current or balance current, and a listing title will not tell you which.

So treat these pages as orientation and the model index and the product page as the record. Where a project needs a decision rather than a definition, the engineering notes work each one through end to end.