Fuse and breaker: labelled reference, US style

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Fuse and breaker: labelled reference, US style, sheet 1 of 1

  1. Fig. 1

    12

    Fuse

    A fuse opens a conducting link when sufficient overcurrent heats the link until it melts.

  2. Fig. 2

    12

    Circuit breaker

    The overcurrent circuit breaker represented here opens its contacts automatically on overcurrent and can be reset.

Terminal key
Fig.TerminalsWhat the terminal is
11, 2The simple fuse-link symbol shown here has two terminals and no polarity mark.
21, 2This symbol has two terminals and no polarity mark. The labels 1 and 2 only tell the two ends apart.

Sources

  1. ModEL — Components and Symbols, §3.10 (fuses and circuit breakers, p. 20), Tony R. Kuphaldt, retrieved 2026-09-22
  2. Lessons In Electric Circuits, Vol. V — §9, Circuit Schematic Symbols (pp. 130–139), Tony R. Kuphaldt, retrieved 2026-09-22
  3. ModEL — Components and Symbols, §3.11 (relay example with motor and lamp loads, p. 22), Tony R. Kuphaldt, retrieved 2026-09-23
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Fuse and breaker Labelled reference
Style
US style
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CC BY 4.0