{"schemaVersion":1,"slug":"voltage-measuring-transducer","name":"Voltage measuring transducer","kind":"symbol","abbreviation":"U/I","aliases":["voltage transducer","AC voltage transmitter"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"Transducer that converts a VT secondary or direct voltage into an isolated analogue signal for remote measurement.","description":["A voltage measuring transducer converts a voltage into a standard analogue signal such as 4-20 mA, with galvanic isolation between input and output. It is fed from a VT secondary or, at low voltage, directly from the busbar through fuses, and it supplies a PLC, SCADA or regulator input.","The symbol does not show whether the output follows RMS or average value, or the live zero of the output range. If the transducer is self-powered from the measured voltage, its output fails when the voltage collapses, which matters when it is used to detect loss of supply."],"readingNotes":["Check whether the transducer has a separate auxiliary supply.","Confirm the output range and live zero."],"drawingChecklist":["Show input fusing","State input and output ranges","Reference receiving input"],"distinction":"A voltage transducer provides a signal to other equipment; a voltmeter displays the reading locally.","facts":[{"label":"Input","value":"VT secondary or direct voltage"},{"label":"Output","value":"Isolated analogue signal"},{"label":"Preview","value":"Independent educational concept; consult the applicable standard and project legend for the exact graphic"}],"references":[{"sourceId":"pub-symbol-signal-isolator","relevance":"Public context for isolated analogue measuring signals."},{"sourceId":"iec-diagrams","relevance":"IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced."}],"related":["active-power-transducer","voltage-transformer","iec-single-phase-ac-to-dc-current-converter"],"artwork":"s28-voltage-measuring-transducer","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","plainEnglish":{"title":"What does Voltage measuring transducer mean?","introduction":"A voltage measuring device that turns a measured quantity into a signal converts a voltage into a standard analogue signal such as 4-20 mA, with electrical separation without a direct conducting path between input and output. It is fed from a VT secondary or, at low voltage, directly from the busbar through fuses, and it supplies a PLC, SCADA or regulator input.","example":"The symbol does not show whether the output follows RMS or average value, or the live zero of the output range. If the device that turns a measured quantity into a signal is self-powered from the measured voltage, its output fails when the voltage collapses, which matters when it is used to detect loss of supply.","drawings":"Check whether the device that turns a measured quantity into a signal has a separate auxiliary supply. Confirm the output range and live zero. A voltage device that turns a measured quantity into a signal provides a signal to other equipment; a voltmeter displays the reading locally.","terms":[{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."},{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Analog current signal isolation","url":"https://www.phoenixcontact.com/en-us/products/signal-conditioner-mcr-c-i-i-0b-0b-dci-2810955"},{"label":"IEC graphical symbols for diagrams","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/"}],"detail":"device that turns a measured quantity into a signal that converts a VT secondary or direct voltage into an isolated analogue signal for remote measurement. A voltage device that turns a measured quantity into a signal provides a signal to other equipment; a voltmeter displays the reading locally.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/voltage-measuring-transducer","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/voltage-measuring-transducer.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-signal-isolator","title":"Analog current signal isolation","publisher":"Phoenix Contact","url":"https://www.phoenixcontact.com/en-us/products/signal-conditioner-mcr-c-i-i-0b-0b-dci-2810955","type":"manufacturer","scope":"Public manufacturer explanation of the equipment function and selection context.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public context for isolated analogue measuring signals."},{"id":"iec-diagrams","title":"IEC graphical symbols for diagrams","publisher":"IEC","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/","type":"standard","scope":"IEC 60617 and related symbol-design publications. Full database access requires a subscription.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced."}]}