Inductor Symbols for Diagrams

This article provides overview of common and less common inductor symbols.

An inductor, also called a coil, choke, winding, inductance or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it. An inductor typically consists of an insulated wire wound into a coil.

Circuit Schematic Symbols of Inductors

There are many different symbols that are used to represent inductors. The most common one is a coil of wire, but you may also see symbols that represent a solenoid or a spiral.

Inductor SymbolDescriptionInductor SymbolDescription
Inductor general symbol 1Air core Inductor, general symbol.
Alternative names: Choke, Coil, Winding.
Earlier published in: IEC 60617-2018.
Inductor continuously variable symbolInductor, continuously variable.
Remarks: The symbol is shown with magnetic core.
Earlier published in: IEC 60617-2018.
Inductor with magnetic core symbolInductor with magnetic core.
Earlier published in: IEC 60617-2018.
Inductor with moveable contact symbolInductor with moveable contact, variable in steps.
Earlier published in: IEC 60617-2018.
Inductor with gap in magnetic core symbolInductor with gap in magnetic core.
Earlier published in: IEC 60617-2018.
Variometer symbolVariometer.
Earlier published in: IEC 60617-2018.
Inductor with fixed tappings symbolInductor with fixed tappings.
Remarks: The symbol is shown with two tappings (taps).
Earlier published in: IEC 60617-2018.
Ferrite core inductor symbolFerrite core inductor symbol.
Iron core inductor symbolIron core inductor symbol.Variable inductor symbolVariable inductor symbol (general).
Shielded inductor symbolShielded inductor symbol.Preset inductor symbolPreset inductor symbol.
Coaxial choke with magnetic core symbolCoaxial choke with magnetic core.
Earlier published in: IEC 60617-2018.
Bifilar Inductor symbolSymbol of Bifilar Inductor.
Reactor symbolReactor, general symbol.
Alternative names: Choke.
Earlier published in: IEC 60617-2018.
Transductor symbolTransductor symbol.
When windings are separated on a drawing, suitable indication shall be provided to show that they are on the same core.
Earlier published in: IEEE Std 315-1975 (Reaffirmed 1993)