CT
Current transformer
A current-measurement transformer used with metering and protection equipment.
SLD / Schematic
IEC · HSW1S90
Phase-to-phase voltmeter selector
This representation identifies selection among phase-to-phase voltage measurement connections.
IEC · Phase-to-phase voltmeter selector
Autodesk IEC-60617 Symbol Preview — Measurement-selection and mechanically operated switch forms; vendor family reference, not certified IEC geometry or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · HSW1S90
What it represents
This representation identifies selection among phase-to-phase voltage measurement connections. The selector connects the meter to the documented line-to-line measurement pairs at its operating positions. It is a measurement interface, not the power switching device of the three-phase circuit.
Provide the actual contact programme and measurement position labels. Identify any instrument-transformer secondary circuits that feed the selector.
How to read it
- Document the selector position table and the meter connection.
- A measurement selector must not be mistaken for a three-phase power isolator.
Information to show or reference
- Identify the associated device, circuit or diagram boundary.
- Document the selector position table and the meter connection.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.
A distinction that matters
A measurement selector must not be mistaken for a three-phase power isolator.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Level, flow, keyed and measurement switches
Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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