What it is and what it does
The Siemens SIRIUS 3RV2011-1AA25-ZW97 is a motor protection circuit breaker designed to protect induction motors against overload, short circuit, and phase failure. It's the dedicated overcurrent device for a motor branch — not a general-purpose breaker. Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting, which is the standard for standard-duty motor starting — catches a stalled rotor before the winding insulation degrades. Rated short-circuit breaking capacity hits 100 kA at 400 V (and at 240 V, 500 V, 690 V), so it can safely interrupt a bolted fault at the motor terminals without needing an upstream current-limiting fuse in most panel designs. Phase failure detection is built in — if one line drops, the breaker trips, preventing single-phasing damage on a motor.
Mounting and integration
Mounts on 35 mm DIN rail per DIN EN 60715, either by snapping on or with screws for vibration resistance. Any mounting position is allowed, but the clearance rules matter: 50 mm above and below, 30 mm to the side, and zero forward or backward clearance — so you can pack breakers side-by-side on the rail with no gap. Dimensions are 45 mm wide, 106 mm tall, 97 mm deep. Main circuit connections are spring-loaded terminals accepting 2 × (0.5 to 2.5 mm²) solid or stranded — no screw torque to verify, faster wiring in the panel.