Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

52

Protection functions

AC circuit breaker

Device function number 52 identifies an AC circuit breaker in the power-system device-function convention. It can appear in equipment identification, control references or a protection drawing, but it remains distinct from the graphical symbol and product specification.

Drawing use

SLD / Schematic

Application

Power distribution

Reference family

IEEE / ANSI

A distinction that matters

The number 52 identifies a device function. It is not an IEC graphical-symbol identifier, breaker current rating or manufacturer model.

Full referenceAdd to legend

86

Protection functions

Lockout

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.

Drawing use

SLD / Schematic

Application

Metering & protection

Reference family

IEEE / ANSI

A distinction that matters

A lockout reference is not a mechanical isolation procedure and does not itself establish an authorised operating instruction.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.