52
AC circuit breaker
The device-function number identifying an AC circuit breaker.
Protection functions
Protection functions · 86
Lockout
A lockout function or device with the documented reset and blocking behaviour.
SLD / Schematic · 86
What it represents
A lockout function or device latches an operating condition and participates in the specified trip or blocking arrangement. Its reset and implementation depend on the selected scheme. It can be realised in physical equipment or through documented control logic.
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 initiating conditions and the affected devices.
- Read reset and blocking behaviour from the actual scheme documentation.
Information to show or reference
- Reference initiating functions.
- Identify blocked or tripped devices.
- Document the selected reset arrangement.
A distinction that matters
A lockout reference is not a mechanical isolation procedure and does not itself establish an authorised operating instruction.
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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