# Mechanical interlock between devices

Canonical URL: https://eloragrid.ai/symbols/iec-mechanical-interlock-between-devices
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: Q021211
Drawing use: Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: Mechanical interlock between devices
Autodesk IEC-60617 Symbol Preview — Mechanical return and interlock qualifiers; vendor family reference, not certified IEC geometry or database identifier.

A mechanical interlock indication links devices whose movements are constrained by a physical relationship.

## What it represents

A mechanical interlock indication links devices whose movements are constrained by a physical relationship. A physical interlock constrains the movements of two associated mechanisms. It remains a mechanical relationship even when the electrical circuit also contains permissive contacts.
Use both device tags and the intended exclusive positions to make the relationship readable. Draw any electrical feedback or auxiliary interlock contact separately, since it represents another interface.

## How to read it

- Identify both devices and the prohibited simultaneous condition.
- Mechanical interlocking differs from an electrical interlock contact or software permissive.

## Information to show or reference

- Identify the associated device, circuit or diagram boundary.
- Identify both devices and the prohibited simultaneous condition.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.

## Important distinction

Mechanical interlocking differs from an electrical interlock contact or software permissive.

## Facts

- Reference scope: Specific public IEC-context family form
- Publisher reference token: Q021211 (Autodesk token; not a verified IEC database ID)
- Information added: Identify both devices and the prohibited simultaneous condition.
- Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic

## Public references

- [Autodesk IEC-60617 preview: Mechanical return and interlock qualifiers](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-084BF99C-FD3E-4ECF-A86B-608EF93DF6E5.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.