Symbol 5032-1 from IEC 60417 - Title/Meaning: Three-phase alternating current Function/description: To indicate on the rating plate that the equipment is suitable for three-phase alternating current only and to identify relevant terminals.
Additional information: 
Published in: IEC 60417 Database
Own work using: iso.org/obp/graphics/grs/633bba23-efb3-4033-99f0-c4c81be1c2bc 200.png
Vectorization:  Mrmw