CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
Symbols · CB ETU
Circuit breaker with electronic trip unit
A breaker electronic trip unit measures current and applies configured protection functions.
SLD / Schematic · CB ETU
What it represents
A breaker electronic trip unit measures current and applies configured protection functions. A functional tag should link the breaker to its selected trip unit, sensors and settings record.
How to read it
- Protection setting letters and function names depend on the trip unit family.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- Name trip unit model
- Reference sensor and rating plug
- Link protection settings
A distinction that matters
The electronic trip unit is part of breaker protection; a remote protection relay is a separate device unless the design documents otherwise.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Circuit-breaker symbol variants
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
Fundamental characteristics of a circuit-breaker
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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