Understand the difference.

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

PUTI

Symbols

Permissive underreach transfer-trip interface

Identifies the documented use of an underreaching local detection and remote permissive path. 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

Scheme naming does not define every terminal behavior. 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

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

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.