# Load-break switch motor operator

Canonical URL: https://eloragrid.ai/symbols/load-break-switch-motor-operator
Publisher: Elora Grid
Updated: 2026-11-03
Lookup label: LSMO
Drawing use: Schematic
Reference families: Manufacturer

Representation: Functional block
Installation focus: switchgear
Input: Open or close command
Output: Switch operating movement

Identifies the electrical operating mechanism serving the selected load-break switch.

## In plain English

### What this block does

Identifies the electrical operating mechanism serving the selected load-break switch.

### A simple example

In a medium-voltage switchgear drawing, the operating reference helps the reader distinguish the interrupting device from its isolation, earthing and auxiliary-control interfaces. For this reference, the drawing identifies “Open or close command” at the input and “Switch operating movement” at the output. Interrupting capability comes from the switch rating.

### What the drawings help you do

Start at the named input: Open or close command. Identify its source device or document and the state represented on the drawing. Follow the named output: Switch operating movement. Cross-reference its destination and separate the command from confirmation that the equipment responded.

### Terms

- Input: Open or close command
- Output: Switch operating movement
- Application reference: An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.

Concept diagram: Open or close command → LSMO → Switch operating movement
A reading guide. The entry's original illustration and input/output facts describe this application.

- [High-voltage circuit breakers](https://www.siemens-energy.com/global/en/home/products-services/product-offerings/circuit-breakers.html)


## What it represents

Identifies the electrical operating mechanism serving the selected load-break switch. A switching-device operating reference adds the specific mechanism or duty context needed to interpret its place in a power circuit. The same basic switching outline can serve different equipment constructions, so the added description must remain attached to its device tag.
In a medium-voltage switchgear drawing, the operating reference helps the reader distinguish the interrupting device from its isolation, earthing and auxiliary-control interfaces. For this reference, the drawing identifies “Open or close command” at the input and “Switch operating movement” at the output. Interrupting capability comes from the switch rating.
Use the device schedule for its actual construction, operating duty and ratings. These original functional illustrations describe the named role and do not certify a standard glyph or product footprint. 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: Open or close command. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Switch operating movement. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Interrupting capability comes from the switch rating.
- Use the device schedule for its actual construction, operating duty and ratings. These original functional illustrations describe the named role and do not certify a standard glyph or product footprint.

## Information to show or reference

- Label the source and connection reference for open or close command.
- Identify the destination and defined state of switch operating movement.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: Interrupting capability comes from the switch rating.

## Important distinction

Interrupting capability comes from the switch rating. 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: Open or close command
- Output / connection: Switch operating movement
- Lookup label: LSMO is a library lookup label, not a standard device designation.

## Public references

- [High-voltage circuit breakers](https://www.siemens-energy.com/global/en/home/products-services/product-offerings/circuit-breakers.html) — Siemens Energy. Public technical context for switching-device operating references. Circuit-breaker construction and interruption families. 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.