CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / 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.
Power distribution
Isolator
Disconnector
A switching device providing an electrical isolation function.
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LBS
Load-break switch
A switch with a specified capability to make and break normal load current.
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ES
Earthing switch
A switch used to connect an identified circuit section to earth.
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FU
Fuse
An overcurrent protective element that interrupts a circuit by melting its fuse link.
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Bus
Busbar
A common conductive connection distributing power to connected circuits.
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TX
Power transformer
Equipment transferring electrical power between winding circuits.
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M
Three-phase motor
An electrical motor load connected to its switching and protective equipment.
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C
Capacitor
A capacitive component or bank identified with its circuit function and ratings.
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CB 1P
Single-pole circuit breaker
A circuit breaker interrupts one pole of a circuit.
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CB TH
Thermal circuit breaker
A thermal circuit breaker uses a temperature-responsive trip mechanism to detect sustained overload.
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CB TM
Thermal-magnetic circuit breaker
A thermal-magnetic breaker combines overload response with a magnetic response to high current.
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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.