Symbol 6170 from IEC 60417 - Title/Meaning: Isolated gripping-lug Function/description: [To identify the fuse-link with isolated gripping-lugs. The graphical symbol element within the square may be filled-in.]
Additional information: 
IEC 60269-2 provides technical spefications.
Own work using: iso.org/obp/graphics/grs/b648fe5d-fcac-4b15-8918-1dc960bf314c 200.png
Vectorization:  Mrmw