Electronic symbol

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Common circuit diagram symbols (US symbols)

An electronic symbol is a pictogram used to represent various electrical and electronic devices (such as wires, batteries, resistors, and transistors) in a schematic diagram of an electrical or electronic circuit. These symbols can (because of remaining traditions) vary from country to country, but are today to a large extent internationally standardized. Some symbols represent components which ceased to be used routinely as newer technologies were introduced (such as vacuum tubes).

Standards for symbols

There are several national and international standards for graphical symbols in circuit diagrams, in particular:

  • IEC 60617 (also known as British Standard BS 3939)
  • ANSI standard Y32 (also known as IEEE Std 315)
  • Australian Standard AS 1102

Different symbols may be used depending on the discipline using the drawing. For example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics. National and local variations to international standards also exist.


Gallery of common electronic symbols

Symbols shown are typical examples, not a complete list.

Resistors

  • American-style resistor (a), rheostat (variable resistor) (b), and potentiometer (c)

  • IEC-style resistor

Capacitors

Transistors

Diodes

Vacuum tubes

Switches

  • Switch, Single Pole/Single Throw (SPST)

  • Switch, Single Pole/Double Throw (SPDT)

  • Switch, Double Pole/Double Throw (DPDT)

Circuit Breakers

  • Molded Case Circuit Breaker (MCCB)

Transformers

  • Transformer with center tap

  • Current Transformer

  • Zero-Sequence Current Transformer (ZSCT) (a.k.a. window-type current transformer)

  • Bushing-Type Current Transformer

  • Voltage Transformer

Miscellaneous

See also

References

    External links

    Wikimedia Commons has media related to Electrical symbols.
    Semiconductor devices
    Vacuum tubes
    Vacuum tubes (RF)
    Cathode ray tubes
    Gas-filled tubes
    Adjustable
    Passive
    Reactive
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