What it is and where it fits
The Siemens 3RV2011-1JA40 is a SIRIUS motor protection circuit breaker designed for protecting three-phase induction motors against overload, short-circuit, and phase failure. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, so it drops into any standard industrial panel without extra bracketry. Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect standard IEC motors during a locked-rotor event without nuisance tripping on normal starts.
Short-circuit ratings that matter
At 400 V the unit holds a 100 kA SCCR, which is enough to sit upstream of most motor starters without needing a current-limiting fuse ahead of it. At 500 V the rating drops to 42 kA, and at 690 V to 4 kA — still serviceable for most 690 V drives, but verify coordination if the available fault current at that voltage exceeds 4 kA. The breaker also carries a gL/gG fuse backup rating: 50 A at 400 V, 40 A at 500 V and 690 V. That tells you the maximum fuse size you can put upstream and still maintain selective coordination.
Motor sizing and horsepower coverage
This breaker covers a wide motor horsepower range: 0.5 hp at 110/120 V up to 10 hp at 575/600 V, with intermediate points at 200/208 V (2 hp), 220/230 V (3 hp), 400 V (1.5 hp), and 460/480 V (5 hp). That makes it a versatile pick for a panel that feeds different voltage taps.
Integration notes
Dimensions are 97 mm deep, 45 mm wide, 97 mm tall — a compact footprint that leaves room for auxiliary contact blocks or a separate overload relay alongside it on the same DIN rail. Mounting position is any orientation, so it fits tight enclosures without derating. Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward. That keeps heat dissipation adequate for the full rated current. Main circuit connections use ring cable lugs (M3 screw). Phase failure detection is built in — no separate phase-loss relay needed.