# ANSI/IEEE maintained normally-closed pushbutton symbol

Canonical URL: https://eloragrid.ai/symbols/ansi-maintained-normally-closed-pushbutton
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: PB NC HOLD
Drawing use: Schematic
Reference families: IEEE / ANSI, Manufacturer

## Symbol convention

Convention: IEEE / ANSI
Form: Autodesk IEEE-oriented Illuminated Push Buttons functional form
Autodesk explicitly publishes this block under IEEE Symbol Preview. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.
Related representation: [Maintained normally-closed pushbutton](https://eloragrid.ai/symbols/maintained-normally-closed-pushbutton)

IEEE-oriented graphical reference for maintained normally-closed pushbutton, with public vendor evidence and drawing-reading notes.

## What it represents

The non-auto-return NC pushbutton form identifies a contact that is closed in its reference state and retained after the operator changes it. The release or reset description determines when continuity is restored.
This is a convention-specific lookup based on the publisher's IEEE-labelled preview. The geometry here is independently drawn to explain the connection or operation; it is not a certified reproduction of the standard graphic.

## How to read it

- Trace the circuit's permissive state through the retained operation.
- Read the selected library and the project legend together. A vendor block identifier is meaningful within its named library and is not a universal standard-symbol code.

## Information to show or reference

- State initial condition
- Show reset/return mechanism
- Name switched circuit

## Important distinction

A retained NC operator is not automatically an emergency-stop device.

## Facts

- Convention evidence: Autodesk IEEE Symbol Preview — Illuminated Push Buttons
- Public vendor block name: HPB12S76 (Autodesk identifier; not an IEEE symbol number)
- Standards context: IEEE/ANSI 315-1975 covers diagram graphics. IEEE lists this edition as Inactive-Reserved.
- Artwork scope: Original functional illustration; exact standard glyph and compliance are not certified

## Public references

- [Autodesk IEEE Symbol Preview — Illuminated Push Buttons](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F7EFADE2-2944-42A1-A5B7-DB6B64694806.htm) — Autodesk. Exact public IEEE-oriented category page verifying the component name and vendor block identifier.
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Graphic-symbol standards context and official status; not a source of reproduced artwork.

## 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.