R
ANSI/IEEE resistor symbol
IEEE-oriented graphical reference for resistor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
Electrical symbols.
Explore electrical symbols, functional blocks and circuit arrangements for switchgear, switchrooms, substations, switchyards and microgrids. Detailed explanations, drawing notes, public sources and original SVG/DXF illustrations.
Electronic components
R VAR
ANSI/IEEE variable resistor symbol
IEEE-oriented graphical reference for variable resistor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
POT
ANSI/IEEE potentiometer symbol
IEEE-oriented graphical reference for potentiometer, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
LDR
ANSI/IEEE light-dependent resistor symbol
IEEE-oriented graphical reference for light-dependent resistor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
VDR
ANSI/IEEE varistor symbol
IEEE-oriented graphical reference for varistor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
SHUNT
ANSI/IEEE current-measuring shunt symbol
IEEE-oriented graphical reference for current-measuring shunt, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
C
ANSI/IEEE capacitor symbol
IEEE-oriented graphical reference for capacitor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
C ELEC
ANSI/IEEE electrolytic capacitor symbol
IEEE-oriented graphical reference for electrolytic capacitor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
C FEED
ANSI/IEEE feedthrough capacitor symbol
IEEE-oriented graphical reference for feedthrough capacitor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
C ADJ
ANSI/IEEE adjustable capacitor symbol
IEEE-oriented graphical reference for adjustable capacitor, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
D
ANSI/IEEE diode symbol
IEEE-oriented graphical reference for diode, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
PD
ANSI/IEEE photodiode symbol
IEEE-oriented graphical reference for photodiode, with public vendor evidence and drawing-reading notes.
IEEE / ANSI
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Read the drawing, not just the mark
Small details. Different meanings.
Understand symbols, equipment tags and function numbers—and know when a generic object needs a manufacturer drawing.
In plain English
What do electrical symbols tell you?
Electrical symbols are shorthand for equipment, functions and connections. They let you follow how a circuit works without drawing every physical detail.
A simple example
On a microgrid single-line diagram, a current-transformer symbol marks a measurement point and a breaker symbol marks where a circuit can be disconnected. Their labels identify the actual equipment.
What the drawings help you do
Follow the connected lines to trace power or control signals. Use the project legend to interpret symbols and the selected manufacturer's drawings for dimensions and terminal connections.
- Single-line diagram
- A simplified power-system drawing that often uses one line to represent a three-phase circuit.
- Legend
- The key explaining a drawing's symbols and labels.