The Siemens SIRIUS 3RV2011-1FA15-0BA0 is a motor protection circuit breaker designed to protect three-phase induction motors against overload and short-circuit. It is rated for a 1.1 kW motor at 230 V and carries a 100 kA breaking capacity at 400 V, meaning it can safely interrupt fault currents up to that level without upstream damage. The Class 10 trip curve ensures it rides through normal motor starting inrush while tripping fast on a locked rotor.
Key ratings and what they mean for fit
The 100 kA SCCR at 400 V and 500 V means this breaker can be used in high-fault-capacity industrial panels without needing upstream current-limiting fuses — a real advantage in retrofit work where the existing bus is stiff. Phase failure detection is built in, so a lost phase on the line side trips the breaker before the motor single-phases to failure. The 45 mm width and 97 mm depth match the standard SIRIUS compact footprint, and the screw-and-snap-on mounting onto 35 mm DIN rail per DIN EN 60715 means it clips into the same rail as contactors and overload relays in the same panel.
Integration and mounting
Mounts in any position on a 35 mm DIN rail per DIN EN 60715. The screw-type terminals accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) — sized for the motor power leads. The M3 main contact screws are standard for this class. Clearance: 50 mm above and below, 30 mm to the side, zero front and back — tight panel spacing is fine as long as vertical air flow is respected.