SSBA
Single-bus single-breaker bay arrangement
Connects the assigned circuit through its breaker to one common bus.
Circuit arrangement
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.
Switchyards
SSA
Sectionalised single-bus arrangement
Divides a common bus into identified sections with a defined section connection.
Circuit arrangement
DSBA
Double-bus single-breaker bay arrangement
Provides the assigned bay with selected connection paths to two buses through one circuit breaker.
Circuit arrangement
DDBA
Double-bus double-breaker bay arrangement
Provides separately switched breaker paths between the assigned circuit and two buses.
Circuit arrangement
MBA
Main-and-transfer bus arrangement
Provides the documented transfer-bus path used alongside the main bus connection.
Circuit arrangement
BDA
Breaker-and-a-half diameter arrangement
Connects two circuits through the documented three-breaker diameter between buses.
Circuit arrangement
RCA
Ring-bus circuit arrangement
Connects circuit takeoffs between adjacent switching devices in the documented bus ring.
Circuit arrangement
MCA
Mesh-corner circuit arrangement
Shows the assigned circuit connections around a documented mesh corner.
Circuit arrangement
SBA
Single-breaker bus-coupler arrangement
Connects the assigned bus sections through their defined coupler breaker path.
Circuit arrangement
BDA
Bus-section disconnector arrangement
Identifies the isolating connection separating the assigned bus conductor sections.
Circuit arrangement
BBA
Bus-transfer bypass arrangement
Shows the alternate path bypassing the assigned bay breaker under its documented configuration.
Circuit arrangement
TSA
Two-bus section-coupler arrangement
Identifies the documented coupler connections between corresponding sections of two buses.
Circuit arrangement
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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.