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

HSW1S94

IEC

Three-point current measurement selector

This representation identifies selection among three current-measurement points. The meter is connected to one of three documented current-measurement circuits. When CT secondaries are involved, the selected switch arrangement must be considered with their continuity and test provisions.

Drawing use: Schematic
Application: Metering & protection
Reference family: IEC / Manufacturer
Form evidence: Three-point current measurement selector. Autodesk IEC-60617 Symbol Preview — Measurement-selection and mechanically operated switch forms; vendor family reference, not certified IEC geometry or database identifier.

A distinction that matters

A current selector cannot be treated as an ordinary voltage selector because CT circuits require documented continuity arrangements.

Full reference

Symbols

Current transformer

A current transformer produces a secondary current related to the current in its primary conductor. A drawing uses the CT representation to show where current is measured and which metering or protection circuit receives that measurement. It does not, by itself, specify the CT ratio, accuracy class, burden or secondary connection.

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

A distinction that matters

A CT measures current. A VT measures voltage. Their secondary circuits and isolation/testing arrangements are different.

Full reference

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