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!