Terminal
Terminal connection
An identified electrical connection point linking schematic and wiring information.
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.
Connections & wiring
CT test
CT test terminal
A current-transformer terminal arrangement providing documented test and shorting facilities.
Schematic
PE
Protective earth
An identified connection serving the protective earthing function.
SLD / Schematic
TB FEED
Feed-through terminal block
A feed-through terminal provides an electrical connection between conductors assigned to the same terminal path.
Schematic
TB DISC
Disconnect terminal block
A disconnect terminal includes a documented separable path for circuit isolation or testing at the wiring level.
Schematic
TB KNIFE
Knife-disconnect terminal
A knife-disconnect terminal opens its circuit path using a documented pivoting knife element.
Schematic
TB FUSE
Fuse terminal block
A fuse terminal integrates a fuse-link into a terminal connection path.
Schematic
TB DIODE
Diode terminal block
A diode terminal includes a semiconductor diode in a documented terminal path.
Schematic
TB COMP
Component terminal block
A component terminal incorporates a documented electrical component or component plug in its wiring path.
Schematic
TB LEVEL
Multilevel terminal block
A multilevel terminal carries two or more documented connection levels within one terminal body.
Schematic
TB MULTI
Multi-conductor terminal block
A multi-conductor terminal provides several connection points for its documented electrical path.
Schematic
TB PE
Protective-earth terminal block
A PE terminal provides a documented protective-conductor connection, often including a specified connection to the mounting rail.
Schematic
Showing 12 of 136
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.