# Key-operated normally-closed switch

Canonical URL: https://eloragrid.ai/symbols/key-operated-normally-closed-switch
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: KEY NC
Drawing use: Schematic
Reference families: IEC, Manufacturer

A key-operated NC switch opens its reference closed contact through the key mechanism.

## What it represents

A key-operated NC switch opens its reference closed contact through the key mechanism. Its access and switching functions must be documented separately.

## How to read it

- Read the reference position from the operator schedule.
- 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

- Define normal key position
- State contact action
- Reference key-removal restrictions

## Important distinction

NC identifies the contact reference state, not a guarantee of tamper-proof control.

## Facts

- Drawing role: Manual operation
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Public vendor block reference: HPB12KS, VPB12KS (Autodesk identifiers; not IEC symbol numbers)
- 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.

## Public references

- [AutoCAD Electrical: Level, flow, keyed and measurement switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1FB94435-C954-4479-BD97-25796DB8F728.htm) — Autodesk. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source 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.