The Siemens SIRIUS 3RV2011-0BA40 is a motor protection circuit breaker in the compact S00 frame, designed for protecting three-phase induction motors against overload and short circuit. Its CLASS 10 trip characteristic means it disconnects within 10 seconds at 7.2× the thermal setting current — the standard match for standard and high-efficiency motors with normal starting times (pumps, fans, compressors). The 100 kA breaking capacity at 400 V AC gives it the interrupting capability to sit directly upstream of a motor starter without requiring a separate backup fuse in most industrial panels.
Sizing and fit
The 45 mm width and 97 mm depth fit the S00 footprint — a standard 45 mm per pole width that aligns with common DIN-rail contactor rows. Screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715 means it clips onto the same rail as a SIRIUS 3RT2 contactor without extra brackets. Any mounting position is allowed, which simplifies layout in crowded enclosures. The M3 ring cable lug connection for the main circuit requires a ring terminal, not a fork or pin — factor that into your wire-prep step.
Trip curve and protection
Phase failure detection is built in — the breaker trips faster on single-phasing, a common failure mode in motor circuits fed through blown fuses or loose connections. Ground fault detection is not included; if GF protection is needed, pair it with a separate ground-fault relay or a SIRIUS 3RV29 accessory. The temperature compensation from -20 to +60 °C keeps the thermal trip curve stable across the rated operating range of -20 to +60 °C, so you don't get nuisance tripping in a hot panel or under-trip in a cold plant room.