Coil
Relay coil
The operating element associated with a relay and its separately drawn contacts.
Schematic
Protection functions · 44
Unit sequence starting relay
Starts the next unit or operating step when the documented sequence condition is met.
SLD / Schematic · 44
What it represents
Starts the next unit or operating step when the documented sequence condition is met.
In a drafting package, connect this reference to the preceding unit status and sequence permissives. The associated drawing should trace the next unit's starting circuit; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings.
How to read it
- Identify the preceding unit status and sequence permissives.
- Trace the next unit's starting circuit.
Information to show or reference
- Label the preceding unit status and sequence permissives.
- Cross-reference the next unit's starting circuit.
- Identify the device tag, manual revision and logic drawing that define this implementation.
A distinction that matters
A unit sequence starting relay advances a defined sequence; it does not identify the entire master sequencer.
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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