# Voltage measuring transducer

Canonical URL: https://eloragrid.ai/symbols/voltage-measuring-transducer
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: U/I
Drawing use: Schematic
Reference families: IEC, Manufacturer

Transducer that converts a VT secondary or direct voltage into an isolated analogue signal for remote measurement.

## In plain English

### What does Voltage measuring transducer mean?

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.

### A simple 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.

### What the drawings help you do

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.

### This particular reference

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.

### Terms

- Signal: Electrical information passed between devices, rather than necessarily the main power supply.
- Rating: A value stating the conditions for which equipment is specified.
- Schematic: A drawing showing function and connections rather than physical appearance.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [Analog current signal isolation](https://www.phoenixcontact.com/en-us/products/signal-conditioner-mcr-c-i-i-0b-0b-dci-2810955)
- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/)


## What it represents

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.

## How to read it

- Check whether the transducer has a separate auxiliary supply.
- Confirm the output range and live zero.

## Information to show or reference

- Show input fusing
- State input and output ranges
- Reference receiving input

## Important distinction

A voltage transducer provides a signal to other equipment; a voltmeter displays the reading locally.

## Facts

- Input: VT secondary or direct voltage
- Output: Isolated analogue signal
- Preview: Independent educational concept; consult the applicable standard and project legend for the exact graphic

## Public references

- [Analog current signal isolation](https://www.phoenixcontact.com/en-us/products/signal-conditioner-mcr-c-i-i-0b-0b-dci-2810955) — Phoenix Contact. Public context for isolated analogue measuring signals.
- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/) — IEC. IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.