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Explanation: These are from the Siemens FWB industrielle Elektrotechnik, in case it helps ... personally, I don't see how a ratio can be switched, but then it is Saturday morning and the coffee hasn't kicked in yet :-)
Übersetzung f (Strom- u. Spannungswandler)
actual transformation ratio IEC 50(321)
Übersetzung (Verhältnis, Trafo)
speed-transforming gear, speed-transforming transmission
Übersetzung (Verhältnis, Getriebe)
It doesn't have Vorschaltgruppe, but gives the following for Vorschaltanlage:
primary switchgear, line-side switchgear
and this for vorschalten
to connect in incoming circuit, to connect on line side, to connect in series
Mary Worby United Kingdom Local time: 16:08 Native speaker of: English PRO pts in pair: 2770