The Siemens 3RV2411-1JA10 is a SIRIUS circuit breaker designed specifically for transformer protection, not general motor or feeder duty. That means its overload curve and short-circuit release are tuned to handle transformer inrush without nuisance tripping — a detail that matters when you're protecting a dry-type or distribution transformer on a 400 V bus. Rated interrupting capacity hits 100 kA at 400 V, which gives you real fault-current headroom in a low-voltage switchgear lineup. At 690 V it still clears 4 kA. That SCCR lets this breaker sit upstream of smaller branch devices without worrying about cascading failure during a bolted fault. Trip Class 10 means the thermal overload element trips within 10 seconds at 7.2× rated current — standard for transformer primary protection where you need fast clearing on a hard fault but tolerance for the magnetizing inrush pulse on energization. Phase failure detection is built in; ground fault detection is not. If your transformer secondary feeds an ungrounded delta or you need GF protection, you'll add an external ground-fault relay or specify a different variant. Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, in any position. The 45 mm width and 97 mm depth mean it occupies a single 45 mm module — standard for a 3-pole breaker in this class — so it drops into existing SIRIUS panels without re-spacing.
Termination & Environment
Main current circuit connections use screw-type terminals, accepting 2× (0.75 to 2.5 mm²) solid or stranded, or 2× 4 mm². The M3 screw is standard for this frame size; torque to the Siemens spec during panel build. Operating temperature range is −20 to +60 °C; storage and transport handle −50 to +80 °C. That covers most indoor panel environments — no special derating needed for a typical MCC room or cabinet. Rated voltage spans 20 to 690 V, covering 400 V and 480 V systems common in industrial distribution. The fuse backup requirements are specified: gL/gG 50 A at 400 V, 40 A at 500 V, and 40 A at 690 V — coordinate your upstream fuse selection accordingly.