Fuse (box with a line through it)

Marks a fuse or where it sits, for example a fuse holder or a fuse box. Any rating printed beside the symbol belongs to that fuse.

Symbol reference: IEC 60417-5016

A mark tells you what the maker declares, never that the product is safe.

What it looks like: A narrow rectangle with a straight line running through it lengthways.
Who may apply it: The equipment maker, to identify a fuse box or where a fuse is located.

What it does not promise

The symbol alone does not give the rating or the speed of the fuse. Fuses are chosen to suit the load, and a time-delay (slow-blow) fuse is built to carry a brief surge that would blow a fast one, so a replacement should match what is printed beside the symbol or in the manual.

Sources

Each page below was fetched and read on the date shown. Where a symbol’s IEC 60417 or ISO 7000 number is given, a public page listing that number is among them.

Wikimedia Commons: File page transcribing IEC 60417 entry 5016 (title, function, publication) — Symbol 5016 from IEC 60417, “Fuse”: to identify fuse boxes or their location. Published in the first edition, 1973. Checked 2026-09-24.
Wikipedia: Fuse (electrical) — “Fuse selection depends on the load's characteristics”; a time-delay (anti-surge or slow-blow) fuse is designed to let a current above its rating flow for a short time without blowing. Checked 2026-09-24.

Written in our own words; quotations are the sources’ wording.