Symbol 5032-2 from IEC 60417 - Title/Meaning: Three-phase alternating current with neutral conductor Function/description: To indicate on the rating plate that the equipment is suitable for three-phase alternating current with a neutral conductor only and to identify relevant terminals.
Additional information: 
Published in: IEC 60417 Database
Own work using: iso.org/obp/graphics/grs/ecda7736-7a88-41bc-ac14-1c22ec810ba2 200.png
Vectorization:  Mrmw