What this breaker is and where it lands
The Siemens SIRIUS 3RV1011-1CA10-ZI45 is a motor-protective circuit breaker in the compact S00 frame — the smallest footprint in the SIRIUS family, meant for panel builders who need to pack motor branches tight on a DIN rail. Its CLASS 10 trip curve means it clears a stalled rotor fast enough to protect a standard three-phase motor winding from overheating during a locked-rotor event, which is the common spec for general-purpose induction motors driving pumps, fans, and small conveyors. Rated at 2.5 A continuous, with an adjustable overload release that dials from 1.8 A up to 2.5 A, it covers fractional-horsepower motors — think a 0.75 kW (1 hp) motor at 400 V three-phase. The magnetic short-circuit trip is fixed; the overload element is thermal, so ambient temperature in the enclosure matters for accurate tripping.
Mounting and panel fit
Snaps onto 35 mm DIN rail per DIN EN 60715, same as every other S00 device in the SIRIUS line. Screw terminals top and bottom, M3 screws torqued to 0.8–1.2 N·m. Mounting position is unrestricted — lay it flat, sideways, upside down, it trips the same. The S00 width is 45 mm, so it occupies one standard module slot on the rail.
How it sits against the 3RV1011-1HA10
The 3RV1011-1HA10 is the higher-current sibling in the same S00 frame — same physical footprint, same DIN rail clip, same screw terminals. It carries an 8 A rating (adjustable 5.5...8 A overload) and a 50 kA interrupting capacity at 400 V AC, versus this part's 13 kA at 400 V. If your motor draws more than 2.5 A or the available fault current at the panel exceeds 13 kA, the 1HA10 is the correct drop-in. Both share the S00 contactor combability and 100 000 electrical cycles typical endurance.