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

CMP

Symbols

Current-measurement merging-unit publisher

Publishes the assigned sampled current quantities from the selected local measurement interface. Digital substation interfaces carry measurements, status and control information between primary equipment and protective devices. Measurement streams, event messages and time synchronization are separate dependencies even when they share an Ethernet network.

Drawing use: Schematic
Application: Metering & protection
Reference family: Manufacturer

A distinction that matters

The stream configuration must identify its measurements. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

IED

Symbols

Numerical protection relay (IED)

A numerical protection relay, or IED, combines many protection, control and measuring functions in one device. Single-line diagrams draw it as a block connected to its CTs, VTs and breaker trip coil, with the enabled functions listed inside or beside it using IEC function symbols or ANSI device numbers.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEC / Manufacturer

A distinction that matters

An IED block represents a multifunction device; a single measuring relay symbol represents one function.

Full reference

Follow the full entry for source drawings and the appropriate standard or selected product. Equipment previews show a manufacturer drawing where available, otherwise a 3D thumbnail.