CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
Symbols · CB TM
Thermal-magnetic circuit breaker
A thermal-magnetic breaker combines overload response with a magnetic response to high current.
SLD / Schematic · CB TM
What it represents
A thermal-magnetic breaker combines overload response with a magnetic response to high current. Its functional annotation helps distinguish the trip mechanism from an electronic trip unit.
How to read it
- A curve designation alone does not state every operating limit or breaking rating.
- 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
- Record rated current and curve
- Show protected poles
- Reference short-circuit rating
A distinction that matters
An electronic trip unit may provide similar protection functions through a different measurement and operating system.
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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