Understand the difference.

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

DBI

Symbols

Directional-comparison blocking interface

Uses the assigned remote blocking information with the local directional protection decision. A protection scheme combines measurements, decision elements and communication or trip outputs to protect a defined part of the network. A function number names a job; the scheme interface shows how that job connects to other equipment.

Drawing use

Schematic

Application

Metering & protection

Reference family

Manufacturer

A distinction that matters

Communication loss behavior must be defined. 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 referenceAdd to legend

DTRI

Symbols

Direct transfer-trip receive interface

Receives the remote trip command assigned to the local breaker control scheme. A protection scheme combines measurements, decision elements and communication or trip outputs to protect a defined part of the network. A function number names a job; the scheme interface shows how that job connects to other equipment.

Drawing use

Schematic

Application

Metering & protection

Reference family

Manufacturer

A distinction that matters

Channel supervision and authority require definition. 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 referenceAdd to legend

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.