CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
Symbols · CB TH
Thermal circuit breaker
A thermal circuit breaker uses a temperature-responsive trip mechanism to detect sustained overload.
SLD / Schematic · CB TH
What it represents
A thermal circuit breaker uses a temperature-responsive trip mechanism to detect sustained overload. Thermal operation and short-circuit interruption capability are separate aspects of the selected device.
How to read it
- Look for the overload characteristic and ambient-temperature conditions in the equipment schedule.
- 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
- Identify thermal setting
- Document breaking capacity
- Reference supply conditions
A distinction that matters
Thermal tripping does not imply the same instantaneous response as magnetic tripping.
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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