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.
Sizing and deployment context
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.