What the ratings mean for fit
The Siemens SIRIUS 3RV1011-4AA10-0AA4 is a motor protection circuit breaker with CLASS 10 trip characteristic. The 13 kA breaking capacity at 400 V AC and 50 kA at 400 V AC tell you this breaker can safely interrupt a fault current up to those levels without welding its contacts or rupturing the enclosure — critical for SCCR compliance in a panel. The lower 13 kA figure is the unconditional breaking capacity; the 50 kA figure applies when coordinated with an upstream fuse or breaker (type 2 coordination). For a 480 V system, the interrupting rating drops to 16 A, meaning this is sized for the motor's full-load current, not the fault level. Phase failure detection is built in — if one phase drops out, the breaker trips, preventing single-phasing damage to the motor. No ground fault detection, so if that's required, add a separate ground-fault relay or choose a variant with that feature.
Panel integration and mounting
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 60715. The 45 mm width is a single modular unit — it occupies one slot on the DIN rail, leaving room alongside a contactor of the same width for a compact motor starter combination. Depth of 75 mm and height of 90 mm fit standard enclosure depths; clearance of 20 mm above and below and 9 mm at the sides is needed for heat dissipation and wiring access. Screw-type terminals for the main current circuit accept 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded wire. Use a PZ1 or PZ2 screwdriver with a 5 to 6 mm shaft diameter. The M3 terminal screws are standard for this class; torque them to the manufacturer's specification (not listed here, but typically 0.8 to 1.2 Nm for M3 in this series).