# Three-phase motor with four connections

Canonical URL: https://eloragrid.ai/symbols/iec-three-phase-motor-with-four-connections
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: HMO14
Drawing use: SLD, Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: Three-phase motor with four connections
Autodesk IEC-60617 Symbol Preview — Three-phase motor forms; vendor family reference, not certified IEC geometry or database identifier.

This representation distinguishes the publisher's three-phase motor form with four indicated connections.

## What it represents

This representation distinguishes the publisher's three-phase motor form with four indicated connections.
Verify the purpose of the fourth connection against the selected motor terminal diagram.
Do not assume the additional connection is a protective-earth terminal without the equipment documentation.

## How to read it

- Verify the purpose of the fourth connection against the selected motor terminal diagram.
- Do not assume the additional connection is a protective-earth terminal without the equipment documentation.

## Information to show or reference

- Identify the associated device, circuit or diagram boundary.
- Verify the purpose of the fourth connection against the selected motor terminal diagram.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.

## Important distinction

Do not assume the additional connection is a protective-earth terminal without the equipment documentation.

## Facts

- Reference scope: Specific public IEC-context family form
- Publisher reference token: HMO14 (Autodesk token; not a verified IEC database ID)
- Information added: Verify the purpose of the fourth connection against the selected motor terminal diagram.
- Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic

## Public references

- [Three-phase motor symbol variants](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-385CBE83-33A3-4314-913E-3B59A6D05F22.htm) — Autodesk. Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.

## 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.