Isolator
Disconnector
A switching device providing an electrical isolation function.
SLD / Schematic
Protection functions · 89
Line switch
The device-function number used for a line-switching or disconnecting device in its documented application.
SLD / Schematic · 89
What it represents
Device function number 89 identifies a line switch in the power-system device-function convention. The selected equipment and drawing context establish its actual operating duties and capabilities; the number is not a substitute for a switch specification.
On a power drawing, keep this function reference connected to the selected equipment and its complete designation. A multifunction relay can implement several numbered functions. This entry explains the reference; it supplies no settings or commissioning procedure.
How to read it
- Identify the physical device associated with the reference.
- Read switching, isolation and position information separately.
Information to show or reference
- Link the equipment identification.
- Reference the selected device capabilities.
- Cross-reference control and position circuits.
A distinction that matters
The number 89 and number 52 identify different device functions. A drawing reference does not establish equivalent interruption capability.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Public reference table of ANSI device-function numbers
Public manufacturer table used to check the base function-number name.
IEEE C37.2-2022: power-system device function numbers
Normative publication reference for the device-function convention.
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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