# Moulded-case circuit breaker

Canonical URL: https://eloragrid.ai/symbols/moulded-case-circuit-breaker
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: MCCB
Drawing use: SLD, Schematic
Reference families: IEC, Manufacturer

An MCCB is a low-voltage circuit breaker built in a moulded insulating case.

## 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

## Important distinction

An MCCB outline on an SLD does not establish a manufacturer's mounting footprint.

## Facts

- Drawing role: Circuit interruption
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Identifier status: The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name.

## Public references

- [Circuit breakers and switches](https://www.se.com/au/en/product-category/4200-circuit-breakers-and-switches/) — Schneider Electric. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.