# ANSI/IEEE Three-wire inductive proximity switch form

Canonical URL: https://eloragrid.ai/symbols/ansi-three-wire-inductive-proximity-switch
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: PROX IND 3W
Drawing use: Schematic
Reference families: IEEE / ANSI, Manufacturer

## Symbol convention

Convention: IEEE / ANSI
Form: Normally Open 3 Wire
Autodesk IEEE Symbol Preview: Inductive Switches, block HPX11IN3. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.
Related representation: [Three-wire inductive proximity switch](https://eloragrid.ai/symbols/three-wire-inductive-proximity-switch)

IEEE-library form of three-wire inductive proximity switch: a three-wire inductive proximity switch uses separate supply, common and output conductors.

## In plain English

### What does ANSI/IEEE Three-wire inductive proximity switch form mean?

This reference locates three-wire inductive proximity switch in Autodesk's IEEE-oriented inductive switches family. A three-wire inductive proximity switch uses separate supply, common and output conductors. Its output polarity and load connection must match the receiving input module. The public library uses HPX11IN3 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.

### A simple example

Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.

### What the drawings help you do

Follow the output common and receiving input polarity together. Three-wire construction describes wiring; normally open or normally closed describes the output's documented switching behaviour. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.

### This particular reference

IEEE-library form of three-wire inductive proximity switch: a three-wire inductive proximity switch uses separate supply, common and output conductors. Three-wire construction describes wiring; normally open or normally closed describes the output's documented switching behaviour.

### Terms

- Normally open / normally closed: The contact state in the normal condition defined for the drawing.
- Terminal: An identified point where a conductor connects.
- Signal: Electrical information passed between devices, rather than necessarily the main power supply.

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.

- [Autodesk IEEE Symbol Preview: Inductive Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-8BB57AEE-EEA3-4ADB-8080-124595C5F63C.htm)


## What it represents

This reference locates three-wire inductive proximity switch in Autodesk's IEEE-oriented inductive switches family. A three-wire inductive proximity switch uses separate supply, common and output conductors. Its output polarity and load connection must match the receiving input module. The public library uses HPX11IN3 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.
Follow the output common and receiving input polarity together. Three-wire construction describes wiring; NO or NC describes the output's documented switching behaviour. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.

## How to read it

- Follow the output common and receiving input polarity together.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.

## Information to show or reference

- Name three terminals
- State PNP or NPN as specified
- Reference PLC input compatibility

## Important distinction

Three-wire construction describes wiring; NO or NC describes the output's documented switching behaviour.

## Facts

- Convention evidence: Autodesk IEEE Symbol Preview: Inductive Switches; published form: Normally Open 3 Wire.
- Public vendor block: HPX11IN3. Vendor library token, not an IEEE symbol number.
- Drawing role: Actuated indication
- Identifier status: The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name.
- Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified.

## Public references

- [Autodesk IEEE Symbol Preview: Inductive Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-8BB57AEE-EEA3-4ADB-8080-124595C5F63C.htm) — Autodesk. Public IEEE-oriented Inductive Switches table explicitly lists HPX11IN3 as Normally Open 3 Wire. This supports the vendor convention context, not reproduction of the publisher graphic.

## 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.