M
Three-phase motor
An electrical motor load connected to its switching and protective equipment.
SLD / Schematic
Protection functions · 35
Brush-operating or slip-ring short-circuiting device
Changes the brush or slip-ring arrangement as part of a wound-rotor machine sequence.
SLD / Schematic · 35
What it represents
Changes the brush or slip-ring arrangement as part of a wound-rotor machine sequence.
In a drafting package, connect this reference to the brush mechanism and slip-ring circuit. The associated drawing should trace the mechanism drive and proof-of-position contacts; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
This designation is useful when reading machine and legacy control drawings. Retain the documented function on an existing drawing and consult the original equipment manual before assigning it to a new design.
How to read it
- Identify the brush mechanism and slip-ring circuit.
- Trace the mechanism drive and proof-of-position contacts.
Information to show or reference
- Label the brush mechanism and slip-ring circuit.
- Cross-reference the mechanism drive and proof-of-position contacts.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
This is a specialist wound-rotor machine function, not a general terminal shorting link.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
ANSI device-number and suffix reference table
Public manufacturer number/name association. Drafting explanations are independently written.
IEEE C37.2-2022: power-system device function numbers
Normative device-number publication; exact edition wording and compliance require the licensed standard.
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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