Side-by-side reference

Understand the difference.

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

First referenceCompare with

Protection functions

Notching or jogging device

Controls limited machine movements or, in modern motor relays, supervises the allowed starting duty.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI

A distinction that matters

The exact 66 application must be stated: jogging control and starts-per-time supervision are not identical behaviours.

Full reference

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 reference

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