CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
Symbols · FU
Fuse
An overcurrent protective element that interrupts a circuit by melting its fuse link.
SLD / Schematic · FU
What it represents
A fuse representation identifies a protective fuse link in a circuit. Its rating and operating characteristics are additional information: a generic fuse mark does not specify utilization category, current, voltage, breaking capacity or coordination with other protective equipment.
Fuses appear in main power circuits, transformer circuits and control supplies. Some assemblies add indication or auxiliary contacts. A drawing should distinguish the protective link from the holder, disconnect mechanism and any indication function.
How to read it
- Follow the protected circuit and identify how many fuse links are represented.
- Treat associated indication contacts as separate schematic elements.
Information to show or reference
- Reference the fuse type and rating.
- Identify the holder or fuse-switch assembly when relevant.
- Keep auxiliary indication and replacement information linked.
A distinction that matters
A fuse and a fused disconnector may share protective components, but the assembly also includes a switching or isolation function.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Fuse and neutral-link symbols
Public fuse, auxiliary-contact and indication categories.
Elementary switching devices
Manufacturer explanation of fuse categories.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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