The Siemens SIRIUS 3RV1021-4CA10-ZW95 is a motor protection circuit breaker rated for 22 A continuous current and 11 kW at 400 V in AC-3 duty — that's the motor-switching rating, so it directly covers a 22 A full-load motor on a 400 V line.
Short-circuit breaking capacity — where this breaker holds and where it doesn't
The SCCR (short-circuit current rating) varies sharply with line voltage: 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. At 400 V, the 50 kA rating covers most industrial service-entrance conditions.
Terminal capacity and wiring constraints
Main circuit terminals accept screw-type connections: solid or stranded conductors 2× (1 … 2.5 mm²) and 2× (2.5 … 6 mm²), or AWG 2× (14 … 10). That's two conductors per terminal, which is useful for daisy-chaining power through the breaker. Finely stranded with core-end processing (ferrules) uses the same ranges. No auxiliary contacts are included as standard — the listing shows 0 for auxiliary contacts, but the device has an auxiliary switch slot (yes) if you need to add one later.
Environmental limits and mechanical endurance
Shock resistance is 25g for 11 ms. The main contacts are rated for 100,000 typical mechanical operations.