A rectangle with a line through it, marking a fuse.
Also known as: Fuse schematic symbol, Rectangle with a line, Cartridge fuse symbol
A fuse is drawn as a rectangle with a line running through it lengthwise — the body and the wire inside that melts. It is a deliberately sacrificial component, and the symbol marks the point a circuit is designed to fail.
Marks a fuse: a component containing a conductor designed to melt and break the circuit when current exceeds a rated value.
Contexts: Electrical equipment
Draws the component literally — the rectangle is the fuse body and the line through it is the element inside that melts.
Contexts: Electrical equipment
Marks the point at which a circuit is intended to fail, which makes it a safety feature rather than a fault; replacing a fuse with a higher-rated one defeats the protection it exists to provide.
Contexts: Electrical equipment
Has several drawn forms in use, including a plain rectangle, a rectangle with a line, and an S-shaped curve within a rectangle, which vary by convention and by era.
No single canonical drawing is asserted here.
Contexts: Electrical equipment
A narrow rectangle standing in a wire, with a straight line running through it from one short end to the other.
Under IEC practice the resistor is also a plain rectangle in a wire; the fuse's internal line is the distinguishing mark.