Technical FAQs

Ask a Question

What is the value of making capacity (Icm-kA peak) for compact NSX range of circuit breaker.

According to the IEC60947-2, if the making capacity (Icm) is equal to the value specified in the attached file ,it is not
 imperative to have a marking on the MCCB concerning the Icm value.
 
This is the reason why there is no information about the Icm concerning the marking and concerning the catalog.



As an example –
 
For the Compact NSX, the short circuit breaking capacity at 440V is 130KA, then Icm can be calculated by the
formula (as per attached IEC document)---
=> Icm = 2.2 x Icu = 2.2 X 130= 286 kA rms.
 

Was this helpful?
What can we do to improve the information ?