The Siemens SIRIUS 3RV2011-1KA15-ZW97 is a motor protection circuit breaker designed to protect motors against overload and short circuits. It's part of the SIRIUS family, built for DIN-rail mounting in control panels, and carries a 100 kA breaking capacity at 400 V — that's the fault current it can safely interrupt without welding its contacts or damaging upstream gear. Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors from locked-rotor heating. Phase failure detection is built in, so if one phase drops out, the breaker opens before the motor single-phases and burns a winding.
Mounting and panel fit
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width (three module spaces) and 97 mm depth mean it fits standard enclosure backplates without overhang. Any mounting position is allowed, so you can orient it vertically or horizontally in a crowded panel.
Breaking capacity and selectivity
At 400 V the rated short-circuit breaking capacity is 100 kA. That's high enough for most industrial main distribution panels — it can clear a bolted fault without needing a current-limiting upstream fuse. At 690 V it drops to 4 kA, so for 690 V systems you'd need to coordinate with a backup fuse or a higher-rated breaker.