What it is and where it goes
The Siemens 3RV2011-1KA15-0BA0 is a SIRIUS motor protection circuit breaker designed for motor protection, with phase failure detection and a CLASS 10 trip curve. It mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, so it drops into a standard panel enclosure alongside other SIRIUS contactors and overloads.
Key ratings and what they mean for fit
The 100 kA breaking capacity at 400 V AC means this breaker can safely interrupt a fault current up to that level without upstream devices needing to clear it — useful for high-fault panels where you want the motor branch to self-protect. At 690 V the rating drops to 4 kA, so verify your system voltage against the curve. The CLASS 10 trip characteristic means it disconnects within 10 seconds at 7.2× the thermal setting, which is the standard for standard induction motor starting — it won't nuisance-trip on a normal start but clears a locked-rotor condition fast enough to protect the motor winding.
Panel fit and wiring
At 45 mm wide and 97 mm deep, this breaker occupies a single 45 mm DIN space — standard for a motor-protection device in this class. The screw-type terminals on the main circuit accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded, which covers the common motor feeder sizes up to about 2.5 mm². Mounting position is any, so it can go sideways in a tight gland plate if needed, though the recommended clearance above and below is 50 mm for heat dissipation.