# Breaker position-discrepancy alarm

Canonical URL: https://eloragrid.ai/symbols/breaker-position-discrepancy-alarm
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: BPA
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchgear
Input: Auxiliary-contact disagreement
Output: Position-discrepancy alarm

Reports an auxiliary-contact combination that persists beyond the allowed transition interval.

## In plain English

### What this block does

Reports an auxiliary-contact combination that persists beyond the allowed transition interval.

### 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 “Auxiliary-contact disagreement” at the input and “Position-discrepancy alarm” at the output. The transition allowance is project-specific.

### What the drawings help you do

Start at the named input: Auxiliary-contact disagreement. Identify its source device or document and the state represented on the drawing. Follow the named output: Position-discrepancy alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Auxiliary-contact disagreement
- Output: Position-discrepancy alarm
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Auxiliary-contact disagreement → BPA → Position-discrepancy alarm
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

Reports an auxiliary-contact combination that persists beyond the allowed transition interval. 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 “Auxiliary-contact disagreement” at the input and “Position-discrepancy alarm” at the output. The transition allowance is project-specific.
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: Auxiliary-contact disagreement. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Position-discrepancy alarm. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The transition allowance is project-specific.
- 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 auxiliary-contact disagreement.
- Identify the destination and defined state of position-discrepancy alarm.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The transition allowance is project-specific.

## Important distinction

The transition allowance is project-specific. 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: Auxiliary-contact disagreement
- Output / connection: Position-discrepancy alarm
- Lookup label: BPA 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.