# IEC magnetic proximity sensor: magnetic proximity switch, normally closed

Canonical URL: https://eloragrid.ai/symbols/iec-magnetic-proximity-sensor-magnetic-proximity-switch-normally-closed
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: MAG
Drawing use: Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: Magnetic Proximity Switch, Normally Closed
Autodesk IEC-60617 Symbol Preview: Magnetic Switches, HPX12M / VPX12M. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted.

Magnetic proximity sensor form: Magnetic Proximity Switch, Normally Closed.

## In plain English

### What does IEC magnetic proximity sensor: magnetic proximity switch, normally closed mean?

A magnetic proximity sensor responds to a magnetic field or a target carrying the specified magnet. This entry identifies the magnetic proximity switch, normally closed form in the publisher's IEC-context family.

### A simple example

A piston magnet or door-mounted magnet can provide a position indication without direct mechanical contact. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state.

### What the drawings help you do

A magnetic sensor can contain a reed contact or powered electronics. The actual output, field orientation and contact ratings must come from the selected device.

### This particular reference

Magnetic proximity sensor form: Magnetic Proximity Switch, Normally Closed. This entry adds the magnetic proximity switch, normally closed detail to the broader magnetic proximity sensor family. A magnetic sensor can contain a reed contact or powered electronics. The actual output, field orientation and contact ratings must come from the selected device.

### Terms

- Normally open / normally closed: The contact state in the normal condition defined for the drawing.
- Signal: Electrical information passed between devices, rather than necessarily the main power supply.
- Rating: A value stating the conditions for which equipment is specified.

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.

- [AutoCAD Electrical: Magnetic proximity switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-B80666C6-215A-40C9-93CD-F394C29C3D33.htm)


## What it represents

A magnetic proximity sensor responds to a magnetic field or a target carrying the specified magnet. This entry identifies the magnetic proximity switch, normally closed form in the publisher's IEC-context family.
A piston magnet or door-mounted magnet can provide a position indication without direct mechanical contact. The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state.
A magnetic sensor can contain a reed contact or powered electronics. The actual output, field orientation and contact ratings must come from the selected device.

## How to read it

- The normally-closed designation starts with a conducting output or closed contact in the documented reference condition; operation changes that state.
- A magnetic sensor can contain a reed contact or powered electronics. The actual output, field orientation and contact ratings must come from the selected device.

## Information to show or reference

- Identify the target, sensing mode and expected normal condition.
- Label supply, output and connector pins from the actual device diagram.
- Reference output circuit type, operating range and controller input.

## Important distinction

This entry adds the magnetic proximity switch, normally closed detail to the broader magnetic proximity sensor family. A magnetic sensor can contain a reed contact or powered electronics. The actual output, field orientation and contact ratings must come from the selected device.

## Facts

- Drawing form: Magnetic Proximity Switch, Normally Closed
- Public vendor block names: HPX12M / VPX12M. Autodesk identifiers, not standards database IDs.
- Drawing purpose: magnetic proximity sensor
- Graphic scope: Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint.

## Public references

- [AutoCAD Electrical: Magnetic proximity switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-B80666C6-215A-40C9-93CD-F394C29C3D33.htm) — Autodesk. Public Magnetic Switches table explicitly lists HPX12M / VPX12M with this operating or connection form. Vendor graphics are linked, not copied.

## 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.