CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
Symbols · MCCB
Moulded-case circuit breaker
An MCCB is a low-voltage circuit breaker built in a moulded insulating case.
SLD / Schematic · MCCB
What it represents
An MCCB is a low-voltage circuit breaker built in a moulded insulating case. Distribution drawings identify its frame, trip rating and trip-unit functions where those affect selection or coordination.
How to read it
- Frame size and configured trip current can be different values.
- 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 frame and trip ratings
- State breaking capacity
- Reference trip-unit settings
A distinction that matters
An MCCB outline on an SLD does not establish a manufacturer's mounting footprint.
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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