The Übertrager is a transformer where the number of wire turns on the primary coil equals the number of wire turns on the secondary coil. In this article, I will explain how the Übertrager is used as a buffer between a civilian telephone system (e.g. Deutsch Reichspost (DRP)) and the Wehrmacht telephone system.
The buffer was created by terminating the incoming DRP telephone line wires on the EP2 and AP1 terminals of the Übertrager. Next, the line wires leading to the Amtszusatz La and Lb terminals (Anschlußklemmen für die Amtsleitung) were terminated on the AS1 and ES2 terminals of the Übertrager.
For example, one can see this application of the Übertrager in the photo of a Luftwaffe large switchboard below.
The switchboard is connected to three DRP lines via the triple Amtszusatz module and three Übertrageren which are mounted on the wall behind the switchboard. Mounting is via a small hole at the bottom of the Übertrager body. When mounted using this hole, the Übertrager hangs up-side-down.
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WW2 German Field Telephone Equipment 