# OT400U21

ABB OT400U21: switching-equipment reference for switch installation and operating arrangement. Manufacturer reference OT400U21.IGS; OT400U21.STP.

## Equipment and file summary

Equipment / resource: OT400U21
Manufacturer: ABB
Resource type: Named drawing reference
Manufacturer drawing: OT400U21.IGS; OT400U21.STP
Manufacturer reference: OT400U21.IGS; OT400U21.STP
Document revision: A
Listed file formats: IGS, STEP
Listed files: 2
Available previews: 1 interactive model variants
Recorded revisions: A
Source checked: 2026-11-04
Download access: Email registration for site downloads; official source links are also available

## Related GA references

- [Switchgear panel](https://eloragrid.ai/objects/switchgear-panel)
- [Switchboard](https://eloragrid.ai/objects/switchboard)
- [Ring main unit](https://eloragrid.ai/objects/ring-main-unit)

Canonical page: https://eloragrid.ai/tools/cad-library/equipment/abb-ot400u21-igs-file-ada2e0696a
Manufacturer: ABB
Entry type: Named drawing reference
Part number: Not specified — select exact configuration
Category: Switchboards & switchgear
Formats: IGS, STEP
Market discovery: Global
Access: Direct download
Official source: https://search.abb.com/library/Download.aspx?DocumentID=OT400U21.IGS&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A
Manufacturer evidence: https://search.abb.com/library/Download.aspx?DocumentID=OT400U21.IGS&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A
Source checked: 2026-11-04

2 original files are available to download here. Manufacturer sources and revisions are listed below.
Confirm the exact regional configuration against the selected manufacturer drawing.
The supplied configuration is “OT400U21”. Keep those frame, mounting and accessory codes with the inserted drawing.


## In plain English

### Using the OT400U21 reference

ABB OT400U21: switching-equipment reference for switch installation and operating arrangement. Manufacturer reference OT400U21.IGS; OT400U21.STP.

### A simple example

OT400U21.igs is advertised as IGS. Its native format needs separate software validation before a browser model can be offered.

### What the drawings help you do

OT400U21.igs is advertised as IGS. Its native format needs separate software validation before a browser model can be offered. Use OT400U21.stp revision A for the supplied solid assembly in your 3D layout.

### Before using this reference

- The supplied configuration is “OT400U21”. Keep those frame, mounting and accessory codes with the inserted drawing.
- Check whether this reference is the switch body, an operating handle or another accessory. Handle and shaft references do not give the complete switch envelope or terminal clearances.

### What can I use the OT400U21 reference for?

Use this switching-equipment reference for switch installation and operating arrangement. The supplied configuration is “OT400U21”. Keep those frame, mounting and accessory codes with the inserted drawing.

### Which manufacturer reference identifies this drawing?

ABB reference OT400U21.IGS; OT400U21.STP. The file list retains the original source and recorded revision.

### Terms


Concept diagram: Identify OT400U21 → Select the drawing or model → Check the mounting interface
The supplied configuration is “OT400U21”. Keep those frame, mounting and accessory codes with the inserted drawing.

- [ABB source](https://search.abb.com/library/Download.aspx?DocumentID=OT400U21.IGS&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A)


## Which file should I choose?

OT400U21.igs is advertised as IGS. Its native format needs separate software validation before a browser model can be offered. Use OT400U21.stp revision A for the supplied solid assembly in your 3D layout.

## Official files

- OT400U21.igs (IGS): https://search.abb.com/library/Download.aspx?DocumentID=OT400U21.IGS&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A
  Site download: https://eloragrid.ai/tools/cad-library/download/abb-ot400u21-igs-file-ada2e0696a/8c5fd31117ad7b11dec4
  Hosting basis: no-explicit-prohibition; publisher attribution: ABB; reviewed: 2026-11-04
  Rights review: Reviewed the available source, embedded drawing text and archive notices. No explicit applicable redistribution prohibition was identified. Rights remain unknown; no licence or manufacturer endorsement is asserted.; evidence: https://search.abb.com/library/Download.aspx?DocumentID=OT400U21.IGS&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A
  Purpose: Manufacturer drawing reference OT400U21.IGS; acquired: true; redistribution: unknown; SHA-256: 8c5fd31117ad7b11dec42996ba1c408c8d16f0b02cf7926a860e698463779dfd; revision: A
- OT400U21.stp (STEP): https://search.abb.com/library/Download.aspx?DocumentID=OT400U21.STP&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A
  Site download: https://eloragrid.ai/tools/cad-library/download/abb-ot400u21-igs-file-ada2e0696a/4d8d914a002c7da6788f
  Hosting basis: no-explicit-prohibition; publisher attribution: ABB; reviewed: 2026-11-04
  Rights review: Reviewed the available source, embedded drawing text and archive notices. No explicit applicable redistribution prohibition was identified. Rights remain unknown; no licence or manufacturer endorsement is asserted.; evidence: https://search.abb.com/library/Download.aspx?DocumentID=OT400U21.STP&LanguageCode=en&DocumentPartId=&Action=Launch&DocumentRevisionId=A
  Purpose: Manufacturer drawing reference OT400U21.STP; acquired: true; redistribution: unknown; SHA-256: 4d8d914a002c7da6788fbe4b3131597080d42a702feb435e34124b7d0da91ba8; revision: A

Global discovery is not proof of regional certification. Confirm exact configuration, revision, dimensional units and use rights with the manufacturer.