Understand the difference.

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

89

Protection functions

Line switch

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.

Drawing use

SLD / Schematic

Application

Power distribution

Reference family

IEEE / ANSI

A distinction that matters

The number 89 and number 52 identify different device functions. A drawing reference does not establish equivalent interruption capability.

Full referenceAdd to legend

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

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