Coil
Relay coil
The operating element associated with a relay and its separately drawn contacts.
Schematic
IEC · Q021211
Mechanical interlock between devices
A mechanical interlock indication links devices whose movements are constrained by a physical relationship.
IEC · Mechanical interlock between devices
Autodesk IEC-60617 Symbol Preview — Mechanical return and interlock qualifiers; vendor family reference, not certified IEC geometry or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · Q021211
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.
A distinction that matters
Mechanical interlocking differs from an electrical interlock contact or software permissive.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEC-60617 preview: Mechanical return and interlock qualifiers
Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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