# Microgrid load-priority assignment block

Canonical URL: https://eloragrid.ai/symbols/microgrid-load-priority-assignment-block
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: MLAB
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: microgrids
Input: Load group identities
Output: Assigned priority map

Associates each defined controllable load group with its selected operating priority.

## In plain English

### What this block does

Associates each defined controllable load group with its selected operating priority.

### A simple example

In a microgrid island, the controller can disconnect lower-priority loads when a source is lost and later request restoration when the documented reserve and stability conditions permit it. For this reference, the drawing identifies “Load group identities” at the input and “Assigned priority map” at the output. Priority changes require controlled configuration.

### What the drawings help you do

Start at the named input: Load group identities. Identify its source device or document and the state represented on the drawing. Follow the named output: Assigned priority map. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Load group identities
- Output: Assigned priority map
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Load group identities → MLAB → Assigned priority map
A reading guide. The entry's original illustration and input/output facts describe this application.

- [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/)


## What it represents

Associates each defined controllable load group with its selected operating priority. Load management balances the available electrical supply against the loads that remain connected. Shedding, restoration, priority and proof of disconnection are separate control functions and should remain traceable to individual load groups.
In a microgrid island, the controller can disconnect lower-priority loads when a source is lost and later request restoration when the documented reserve and stability conditions permit it. For this reference, the drawing identifies “Load group identities” at the input and “Assigned priority map” at the output. Priority changes require controlled configuration.
Identify each load group, priority, measured contribution and feedback. Shedding amounts, operating times and restoration conditions require the approved power-management design and the actual connected-load data. 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: Load group identities. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Assigned priority map. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Priority changes require controlled configuration.
- Identify each load group, priority, measured contribution and feedback. Shedding amounts, operating times and restoration conditions require the approved power-management design and the actual connected-load data.

## Information to show or reference

- Label the source and connection reference for load group identities.
- Identify the destination and defined state of assigned priority map.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Priority changes require controlled configuration.

## Important distinction

Priority changes require controlled configuration. 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: Microgrids
- Input / boundary: Load group identities
- Output / connection: Assigned priority map
- Lookup label: MLAB is a library lookup label, not a standard device designation.

## Public references

- [Avista Shared Energy Economy microgrid protection and control case study](https://selinc.com/api/download/135486/) — SEL. Public technical context for microgrid load shedding and restoration. Storage, protection, black start, load restoration and coordinated island operation. 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.