This article concerns the Schneider NSX 100 circuit breaker used in Sirius.
In Sirius we have only connected the SD contact which indicates ANY kind of trip – even one coming from the undervoltage coil. This is why we always have the fault MCB.
MCB origin | Cause | State card DIM | Fault Label |
SKMCB pin15 to SD contact (Trip indication – page 47 of user manual) |
| Digital bank0 -> Bit 0 | MCB FAULT |
SDE contact exists but we have not connected it unfortunately. This should give us the info about whether it was a thermal trip. |
| Not used | |
Not connected. The fault is generated by the state card. | Mbc contact state does not match command status:
| Digital bank1 -> Bit 2 | MCB WRONG STATUS |
MCB Fault | Only in 18kV systems | Digital bank 1 -> Bit 5 |
From Page 47 of the Schneider NSX 100 user manual
