CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
Symbols · MCB
Miniature circuit breaker
An MCB is a compact low-voltage circuit breaker commonly used for final circuits and auxiliary supplies.
SLD / Schematic · MCB
What it represents
An MCB is a compact low-voltage circuit breaker commonly used for final circuits and auxiliary supplies. Its symbol must be accompanied by the actual rating, pole count and applicable device standard.
How to read it
- Do not infer interrupting rating from the MCB abbreviation.
- 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
- State current rating and curve
- State pole arrangement
- Reference product breaking rating
A distinction that matters
MCB describes a product family; thermal-magnetic describes an operating mechanism.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Circuit breakers and switches
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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