# Breaker local-remote authority indication

Canonical URL: https://eloragrid.ai/symbols/breaker-local-remote-authority-indication
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: BLAI
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchgear
Input: Control-selector position
Output: Control authority status

Reports which operating location currently has command authority over the breaker.

## In plain English

### What this block does

Reports which operating location currently has command authority over the breaker.

### 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 “Control-selector position” at the input and “Control authority status” at the output. Authority selection is not a permission to bypass interlocks.

### What the drawings help you do

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

### Terms

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

Concept diagram: Control-selector position → BLAI → Control authority 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

Reports which operating location currently has command authority over the breaker. 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 “Control-selector position” at the input and “Control authority status” at the output. Authority selection is not a permission to bypass interlocks.
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: Control-selector position. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Control authority status. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Authority selection is not a permission to bypass interlocks.
- 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 control-selector position.
- Identify the destination and defined state of control authority status.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Authority selection is not a permission to bypass interlocks.

## Important distinction

Authority selection is not a permission to bypass interlocks. 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: Control-selector position
- Output / connection: Control authority status
- Lookup label: BLAI 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.