phoebus je napisal/-a:Žal nimaš prav. Preberi tole:

http://zone.ni.com/devzone/conceptd.nsf ... D400569EB7

In lahko lepo prebereš, da je rele galvanska ločitev.
" The drive circuitry in electromechanical relays is galvanically isolated from the relay contacts, and the contacts themselves are also isolated from one another. This isolation makes electromechanical relays an excellent choice for situations where galvanic isolation is required. "

O galvanski ločitvi se govori, ko tokokrog A vpliva na tokokrog B, s katerim nima dejanskega stika.

Seveda pa se pod galvansko ločitev šteje tudi 1:1 trafo.