Understand the difference.

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

AT 1PH

IEEE / ANSI

ANSI/IEEE single-phase autotransformer symbol

The single-phase autotransformer form identifies a shared winding path between input and output. Following that common electrical path explains why this device differs from two electrically separate windings even when the voltage transformation purpose is similar.

Drawing use

SLD / Schematic

Application

Power distribution

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Autodesk IEEE-oriented Transformers functional form. Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

An autotransformer does not provide the same winding separation as a two-winding transformer.

Full referenceAdd to legend

AT 1PH

Symbols

Single-phase autotransformer

A single-phase autotransformer uses a winding portion shared electrically by its input and output circuits. Its drawing must make the common connection clear because it does not provide winding separation like a two-winding transformer.

Drawing use

SLD / Schematic

Application

Power distribution

Reference family

IEC / Manufacturer

A distinction that matters

An autotransformer is not an isolating two-winding transformer.

Full referenceAdd to legend

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