What this MCCB delivers
The Siemens SIRIUS 3RV1374-7GN10 is a 3-pole molded-case circuit breaker (MCCB) rated for 400 A continuous current, with a breaking capacity of 200 kA at 400 V AC — enough to handle high-fault industrial feeders without cascading upstream. Designed specifically for starter combinations, it integrates into motor control centers where coordination with contactors and overloads is critical. Rated voltage spans 20 to 690 V AC, and the AC-3 operational current at 400 V matches the continuous rating at 400 A, so it switches motor loads up to that current under full load. The electronic short-circuit trip provides precise, adjustable protection curves. Mounting position is any orientation, with screw fixing to the panel backplate. The front face carries IP20 finger-safe touch protection, and the screw-type terminals on both main and auxiliary circuits accept standard lug connections.
Sizing and deployment context
At 205 mm high, 140 mm wide, and 103.5 mm deep, this MCCB fits standard panel layouts with zero clearance required at the back and sides — no extra air gap needed for arc flash containment in the enclosure. The 200 kA SCCR at 400 V means it safely interrupts faults up to that level without requiring upstream fuses or a current-limiting reactor. Operates from -25 to +60 °C ambient, with storage and transport range of -40 to +70 °C. Shock rated at 12g for 11 ms, so it holds up in mobile or high-vibration installations. Maximum installation altitude is 2 000 m above sea level.