What it is and what it does
The Siemens 3RV2411-1GA10-0BA0 is a SIRIUS circuit breaker designed specifically for transformer protection — not a general-purpose motor-protective breaker. Its Trip Class 10 means it trips within 10 seconds at 7.2× rated current, fast enough to limit transformer inrush stress while riding through normal magnetizing peaks. The breaker carries a 100 kA breaking capacity at 400 V AC, so it can interrupt a bolted fault on a 400 V bus without upstream fuses needing to clear first. It also includes phase failure detection, which catches a lost phase on the primary side before the transformer draws single-phase current and overheats.
Mounting and integration
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The S00 frame size keeps the width at 45 mm — fits a standard 45 mm slot in a motor control center or distribution panel. Mounting position is any, so vertical or horizontal rail orientation works. Clearance: 50 mm upwards and downwards, 30 mm at the side; zero forwards or backwards. Main circuit terminals accept solid or stranded up to 2× 2.5 mm² or a single 4 mm², with M3 screws and a Pozidriv size 2 tip.
Back-up fuse coordination
The breaker requires back-up fuses for fault levels above its own interrupting rating. At 400 V the maximum back-up fuse is gG 50 A; at 500 V it drops to gG 40 A; at 690 V it is gG 35 A. The interrupting capacity at 690 V AC is 6 kA — substantially lower than the 100 kA at 400 V — so on a 690 V line the back-up fuse must clear any fault above 6 kA. For transformer protection, this coordination ensures the breaker clears low-level overloads while the upstream fuse handles rare high-energy faults.