# AC circuit breaker

Canonical URL: https://eloragrid.ai/protection-functions/52-ac-circuit-breaker
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: 52
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI

The device-function number identifying an AC circuit breaker.

## What it represents

Device function number 52 identifies an AC circuit breaker in the power-system device-function convention. It can appear in equipment identification, control references or a protection drawing, but it remains distinct from the graphical symbol and product specification.
On a power drawing, keep this function reference connected to the selected equipment and its complete designation. A multifunction relay can implement several numbered functions. This entry explains the reference; it supplies no settings or commissioning procedure.

## How to read it

- Associate the number with the intended breaker equipment reference.
- Read auxiliary-contact and control designations from the applicable documentation.

## Information to show or reference

- Link the breaker equipment tag.
- Cross-reference close and trip circuits.
- Reference auxiliary contacts and device documentation.

## Important distinction

The number 52 identifies a device function. It is not an IEC graphical-symbol identifier, breaker current rating or manufacturer model.

## Facts

- ANSI / IEEE function number: 52
- Equipment implementation: Consult the selected device manual
- Suffix interpretation: Application and manufacturer documentation

## Public references

- [Public reference table of ANSI device-function numbers](https://www.se.com/es/es/faqs/FA34639/) — Schneider Electric. Public manufacturer table used to check the base function-number name.
- [IEEE C37.2-2022: power-system device function numbers](https://ieeexplore.ieee.org/document/9984140) — IEEE. Normative publication reference for the device-function convention.

## 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.