Symbol 5221 from IEC 60417 - Title/Meaning: Isolating transformer, general Function/description: To identify a transformer of the isolation type.
Additional information: 
To indicate a fail-safe function, the letter F may be used adjacent of the graphical symbol.
See also symbols 5156, 5944 and 5945
Published in: IEC 60417 database;3C/943/FDIS
Own work using: iso.org/obp/graphics/grs/3d3da6c7-45d4-4f7e-92e6-da04242f97a6 200.png
Vectorization:  Mrmw