M
Three-phase motor
An electrical motor load connected to its switching and protective equipment.
SLD / Schematic
Protection functions · 48
Incomplete-sequence relay
Detects that an operating or starting sequence has not completed as required.
SLD / Schematic · 48
What it represents
Detects that an operating or starting sequence has not completed as required.
In a drafting package, connect this reference to the start/sequence initiation and completion indications. The associated drawing should trace the timeout alarm and stopping or reset circuit; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the start/sequence initiation and completion indications.
- Trace the timeout alarm and stopping or reset circuit.
Information to show or reference
- Label the start/sequence initiation and completion indications.
- Cross-reference the timeout alarm and stopping or reset circuit.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
Incomplete sequence supervision checks completion; a starts-per-hour limit is a separate 66 application.
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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