Is Zone Selective Interlocking (ZSI) feature available in Compact NSX MCCB.
The ZSI (Zone Selectivity Interlocking) function is a technique used to reduce the electrodynamic stress
on equipment when time discrimination is used.
For Compact NSX MCCB ZSI works only for short time Isd and ground fault Id protection without time delay.
It doesn't work for Long time and Instantaneous protection.
For Compact NSX 100 to 250, the ZSI function is available only in relation to the upstream circuit breaker.
The ZSI function can only be used with the trip units Micrologic 5 and 6.