M
Three-phase motor
An electrical motor load connected to its switching and protective equipment.
SLD / Schematic
IEC · HMO14
Three-phase motor with four connections
This representation distinguishes the publisher's three-phase motor form with four indicated connections.
IEC · 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.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
SLD / Schematic · HMO14
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.
A distinction that matters
Do not assume the additional connection is a protective-earth terminal without the equipment documentation.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Three-phase motor symbol variants
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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