SIRIUS 3RV2031-4EB10-0BA0 — motor protection circuit breaker, size S2
The Siemens SIRIUS 3RV2031-4EB10-0BA0 is a size S2 motor protection circuit breaker designed for motor loads. It carries a Trip Class 20 characteristic, meaning it allows a 20-second overload trip delay at 7.2× rated current — standard for starting high-inertia loads like conveyors or fans without nuisance tripping. Rated breaking capacity hits 30 kA at 400 V AC, which covers most industrial distribution panels up to that fault level without needing an upstream current-limiting fuse.
Breaking capacity and selectivity
At 400 V AC the unit interrupts 30 kA (Icu per IEC 60947-2). At 240 V AC that figure rises to 50 kA. For higher fault currents, the manufacturer specifies upstream gG fuse coordination: 125 A at 400 V, 100 A at 500 V, 80 A at 690 V. This lets the panel designer size the branch protection without over-fusing the feeder.
Mounting and panel integration
Mounts via screw fixing or snap-on onto 35 mm DIN rail per EN 60715. Any mounting position is permitted. Clearance requirements: 50 mm above and below, 10 mm at the sides. The S2 frame (55 mm wide, 140 mm tall, 149 mm deep) fits standard motor starter combos alongside a contactor on the same rail. Terminals accept up to 35 mm² stranded wire; screwdriver shaft diameter 5–6 mm, Pozidriv size 2 tip.
Environmental and operational range
Rated for operation from -50 °C to +60 °C, with temperature compensation active between -20 °C and +60 °C. Storage and transport range extends to -50 °C to +80 °C. Phase failure detection is built in; ground fault detection is not. Maximum switching frequency in AC-3 duty is 15 operations per hour.