# Breaker 52a auxiliary-contact interface

Canonical URL: https://eloragrid.ai/symbols/breaker-52a-auxiliary-contact-interface
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: B5AI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchgear
Input: Main mechanism position
Output: 52a status

Uses the breaker auxiliary contact that follows the documented closed main-contact condition.

## In plain English

### What this block does

Uses the breaker auxiliary contact that follows the documented closed main-contact condition.

### A simple example

In a switchgear control schematic, the bay controller compares independent status contacts before displaying a position or allowing another operation. The signal labels explain which physical state each contact represents. For this reference, the drawing identifies “Main mechanism position” at the input and “52a status” at the output. Auxiliary position does not measure current flow.

### What the drawings help you do

Start at the named input: Main mechanism position. Identify its source device or document and the state represented on the drawing. Follow the named output: 52a status. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Main mechanism position
- Output: 52a status
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Main mechanism position → B5AI → 52a status
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Masterclad medium-voltage switchgear: circuit-breaker section interlocks](https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7)


## What it represents

Uses the breaker auxiliary contact that follows the documented closed main-contact condition. Breaker status indications describe the operating mechanism, the removable truck or the health of a supporting system. These signals are related but are not interchangeable: an open breaker can still have its truck connected to live bus contacts.
In a switchgear control schematic, the bay controller compares independent status contacts before displaying a position or allowing another operation. The signal labels explain which physical state each contact represents. For this reference, the drawing identifies “Main mechanism position” at the input and “52a status” at the output. Auxiliary position does not measure current flow.
Keep contact reference conditions, terminal numbers and interpretation logic together. Distinguish a mechanically operated indication from a measured current or voltage condition. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

## How to read it

- Start at the named input: Main mechanism position. Identify its source device or document and the state represented on the drawing.
- Follow the named output: 52a status. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Auxiliary position does not measure current flow.
- Keep contact reference conditions, terminal numbers and interpretation logic together. Distinguish a mechanically operated indication from a measured current or voltage condition.

## Information to show or reference

- Label the source and connection reference for main mechanism position.
- Identify the destination and defined state of 52a status.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Auxiliary position does not measure current flow.

## Important distinction

Auxiliary position does not measure current flow. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

## Facts

- Representation: Functional block
- Installation focus: Switchgear
- Input / boundary: Main mechanism position
- Output / connection: 52a status
- Lookup label: B5AI is a library lookup label, not a standard device designation.

## Public references

- [Masterclad medium-voltage switchgear: circuit-breaker section interlocks](https://productinfo.se.com/masterclad_mv_switchgear_ib/6055-30-masterclad-15kv-mv-switchgear-ib/English/6055-30%20Masterclad%20MV%20Switchgear%20Indoor%20%28bookmap%29_DD00646805.xml/%24/Section6-CircuitBreakerSectionInter-58DD6EC7) — Schneider Electric. Public technical context for breaker position and status interfaces. Breaker control, mechanism, position contacts, racking interlocks and test interfaces. The application text and educational graphic are independently authored; the publisher does not certify this representation.

## 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.