The Siemens SIRIUS 3RV1011-1EA15-ZI45 is a motor-protective circuit breaker in size S00, rated at 4 A operating current with a CLASS 10 trip characteristic. The overload release adjusts from 2.8 to 4 A via a dial, and it comes with a built-in transverse auxiliary switch (1 NO + 1 NC) for status feedback. It mounts on a 35 mm DIN rail per DIN EN 60715 and accepts screw-type terminals for the main circuit.
What the ratings mean for fit
CLASS 10 means the overload element trips within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during a locked-rotor condition without nuisance tripping on normal starts. The adjustable overload range of 2.8…4 A covers small motors in the 0.75–1.5 kW ballpark at 400 V (the part is rated 1500 W at 400 V). The magnetic short-circuit trip responds at 52 A (N release), clearing faults before the contactor welds. Size S00 keeps the footprint compact — 45 mm wide — so it fits neatly on a DIN rail alongside a S00 contactor in a motor starter assembly. The screw-type terminals accept 2× (0.5…1.5 mm²) or 2× (0.75…2.5 mm²) solid/stranded wire, and the mounting position is unrestricted (any orientation).