AND
AND gate
A logic element whose output is true when all stated positive-logic inputs are true.
Schematic
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.
Logic & signals
OR
OR gate
A positive-logic element whose output is true when at least one input is true.
Schematic
NAND
NAND gate
A logic gate that inverts the result of an AND operation.
Schematic
NOR
NOR gate
A logic gate that inverts an inclusive-OR result.
Schematic
XOR
Exclusive-OR gate
For two positive-logic inputs, produces a true output when the input states differ.
Schematic
XNOR
Exclusive-NOR gate
For two positive-logic inputs, produces a true output when the input states are equal.
Schematic
NOT
Logic inverter
Produces the opposite logical state of its defined digital input.
Schematic
BUF
Non-inverting logic buffer
Transfers a digital state through a non-inverting logic output stage.
Schematic
3STATE
Three-state logic buffer
A digital output stage that can drive logical states or enter its documented high-impedance state.
Schematic
SCHMITT-NOT
Schmitt-trigger inverter
A digital inverter with hysteresis between its input switching thresholds.
Schematic
SCHMITT
Schmitt-trigger buffer
A non-inverting digital element with separate rising and falling input thresholds.
Schematic
D-FF
Positive-edge D flip-flop
Captures its data input at the documented positive clock edge and retains that digital state.
Schematic
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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.