What it is and what it does
The Siemens SIRIUS 3RV2011-1HA10-0BA0 is a motor protection circuit breaker in the compact S00 frame size, designed to protect motors against overload, short-circuit, and phase failure. It snaps onto a 35 mm DIN rail (per DIN EN 60715) and terminates via screw-type terminals, making it a straightforward swap in existing panels. Its Class 10 trip characteristic means it will disconnect a locked-rotor motor fast enough to protect most standard induction motors, but not so fast that it nuisance-trips on normal starting inrush. The interrupting capacity is 100 kA at 400 V AC — that's the fault current it can safely clear without blowing apart, which covers the vast majority of industrial panel bus ratings. Phase failure detection is built in, so if a motor loses a phase upstream the breaker trips, preventing single-phasing damage. No ground fault detection here — that's separate if your application needs it.
Panel fit and mounting
S00 frame is 45 mm wide on the DIN rail. Depth is 97 mm. Mounting position is any orientation. Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward. That's the air gap needed for arc quenching and heat dissipation. If you're packing multiple breakers side-by-side, respect those numbers or the interrupting capacity derates. Terminals accept up to 2x 4 mm² solid/stranded, or 2x 2.5 mm² ferruled. Use a Pozidriv size 2 screwdriver with a 5–6 mm shaft diameter. The screw-type terminals are robust for panel wiring but take a little longer than spring-cage — plan your wiring schedule accordingly.