Automatic disconnection in case of a fault

[nick83]

We are including NSX circuit breakers with Micrologic 2.2 trip units for some of the final circuits in our main distribution cabinet ( C16N4 with C1642D160)

When verifying Zs × Ia ≤ Uo condition according IEC 60364 4 41 can we use Isd setting that can be adjusted from 1.5 - 10xIr and what is max break time in that case. I see that there is no adjustable time delay and maximum break time is 80ms which is well under allowed 0.4s but is that total break time. 

I ask this because Ii is too high for some applications so it would be more convenient to use Isd setting.

Is there any Schneider documentation that explains these settings and their use.

Thank You

[Manon_Chaboud]

Hello @nick83, thank you for your post, we'll come back to you!