Schneider Electric C12N3TM125B ComPacT NSXm160N 3P 125 A 50 kA TM-D Fixed Moulded Case Circuit Breaker

The C12N3TM125B is a 3-pole Schneider Electric ComPacT NSXm160N moulded case circuit breaker rated 125 A, with a TM-D thermal-magnetic trip unit and an N-performance 50 kA breaking capacity (Icu) at 380/415 V AC. Rated operational voltage (Ue) is 440 V AC. The 81 x 137 x 80 mm frame is built for compression-lug or busbar distribution circuits needing higher fault-current withstand than the F level.

Technical Specifications

Certifications & Standards

• EN/IEC 60947-2

Selection Notes

The N performance level gives the C12N3TM125B 50 kA Icu against the 36 kA of the equivalent F-rated NSXm160F frame, so it suits boards closer to the transformer where prospective fault current is higher. Ics equals Icu across the full voltage range (90/50/50 kA), meaning the breaker is rated to clear its full ultimate fault current and remain in service afterward, not just survive a single trip. Below 125 A load the thermal setting can be trimmed down to 0.7 x In on the same unit.