Upside-Down Installation of Masterpact NW 2000A and 2500A Circuit Breakers

[htsaeidi69]

Does anyone have experience or insights on installing Masterpact NW 2000A (NW20) and 2500A (NW25H1, 65kA, 4-pole, fixed) air circuit breakers upside-down in an enclosure? We’re designing a switchboard where these breakers may need to be mounted in this orientation. Our concerns include:

• Impact on mechanical components (e.g., grease displacement, main contacts, arc chute).
• Compatibility with mechanical interlocks (e.g., rod interlocks).
• Enclosure requirements (ventilation, vibration damping up to 0.7g, IP54 protection).

We’ve reviewed Data Bulletin 0613DB1501 and Masterpact NT/NW Maintenance Guide (LVPED508016EN) but found no explicit guidance on upside-down installation. Any recommendations or experiences? Has Schneider provided specific guidelines for this?

Thanks for your help!

[Manon_Chaboud]

Hello @htsaeidi69, thank you for your post, we'll come back to you!

[NeiB · Accepted solution]

Hi @htsaeidi69 ,

Hope you are very well.

Please see at the page F-6 (sheet 156) of catalogue of link below that there is only one position allowed for MTZ:

https://download.schneider-electric.com/files?p_Doc_Ref=LVPED216026EN_WEB&p_enDocType=Catalog&p_File... 

I am not quite sure what you mean with upside-down, but maybe having the income from the bottom would suit  your project (information on the same page as above):

Regards,

Neide